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375 - Pulse or digital communications

375240000 - BANDWIDTH REDUCTION OR EXPANSION

375240010 - Television or motion video signal

375240120 - Predictive

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DocumentTitleDate
20090310677IMAGE ENCODING AND DECODING METHOD AND APPARATUS - An image encoding apparatus includes a first selector selecting a prediction-order to sub-blocks obtained by further dividing pixel-blocks obtained by dividing a frame of an input-image-signal from predetermined prediction-orders, a second selector selecting, from prediction-modes regulating a manner of referring to an encoded-pixel when a first-prediction-signal of each-sub-block is generated with reference to the encoded-pixel, the number of prediction-modes used in prediction of the first-prediction-signal, a third selector selecting prediction-modes the number of which is the selected number from prediction-modes to use the prediction-modes in prediction of the first-prediction-signal, a generator generating the first-prediction-signal in the selected prediction order by using the selected prediction-modes the number of which is the selected number to generate a second-prediction-signal corresponding to the pixelblock, and an encoder encoding a prediction-residual-error-signal expressing a difference between an image-signal of the pixel-block and the second-prediction-signal to generate encoded data obtained by the prediction-encoding.12-17-2009
20090196352Video decoder system and method with video enhancement using direct contrast enhancement in the spatial domain - Video decoding with video enhancement using direct contrast enhancement in the spatial domain including transforming the decoded intramacroblock output to a matrix of spatial domain coefficients; multiplying the spatial domain coefficients with the corresponding intramacroblock enhancement matrix elements of an intramacroblock enhancement matrix to provide enhanced spatial coefficients; transforming said enhanced spatial coefficients to the temporal domain to generate an enhanced decoded intramacroblock; multiplying the spatial domain intermacroblock coefficients from the entropy decoder of the video decoder with the corresponding intermacroblock enhancement matrix elements of an intermacroblock enhancement matrix to provide enhanced spatial coefficients, and transforming the enhanced spatial coefficients to generate enhanced decoded residual coefficients.08-06-2009
20080260031PIXEL-BY-PIXEL WEIGHTING FOR INTRA-FRAME CODING - Techniques for improving the accuracy of prediction in intra-frame coding. A prediction mode can specify a pixel along a direction independently of other pixels along the same direction. In an embodiment, an encoder selects a prediction mode to best represent the image block. In an alternative embodiment, a decoder reconstructs each pixel in the image block by weighting neighboring pixels according to a weight matrix specified by the prediction mode.10-23-2008
20080260030DIRECTIONAL TRANSFORMS FOR INTRA-CODING - Techniques for transforming the prediction error of intra-coded blocks using mode-dependent transform functions. In an embodiment, an encoder selects a set of transform functions to represent prediction error based on the spatial mode used for prediction. In an alternative embodiment, a decoder reconstructs an image block by using the signaled spatial mode to derive the corresponding set of transform functions. No additional signaling between encoder and decoder is required as compared to prior art implementations.10-23-2008
20100074335MOVING PICTURE CODING METHOD AND MOVING PICTURE DECODING METHOD - A moving picture coding apparatus 03-25-2010
20130077689METHOD AND APPARATUS FOR PROCESSING A VIDEO SIGNAL - The present invention relates to a method and apparatus for encoding or decoding a video signal. According to the present invention, a plurality of reference units for image prediction of the current unit is acquired and combined to obtain a unit prediction value, thereby improving the accuracy of image prediction. More particularly, the present invention relates to a method for inducing a variety of reference units using a motion vector prediction value or a motion vector which is used in conventional inter-prediction, and also relates to a method which combines the reference units so as to obtain the prediction value for the current unit. In addition, the present invention relates to a method which involves acquiring a plurality of reference units for a merging mode, and combining the reference units so as to perform image prediction.03-28-2013
20130077688INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.03-28-2013
20130077687CODING REFERENCE PICTURES FOR A REFERENCE PICTURE SET - Techniques are described related to coding of long-term reference pictures for a reference picture set. In some examples, a video coder may code candidate long-term reference pictures in a parameter set. The video coder also code syntax elements that indicate which long-term reference pictures from the candidate long-term reference pictures belong in the reference picture set.03-28-2013
20080219350H.264/AVC intra coding algorithms having quality scalability - Different algorithms are used in H.264/AVC intra coding to form three coding levels. Algorithms used in two of the three coding levels reduce calculation complexities and power consumptions. The basic level is an exception, which fully keeps an original picture quality. Thus, various needs can be met by coding in the various levels with the various algorithms.09-11-2008
20090180539Interpolated Skip Mode Decision in Video Compression - This invention enables determination of the best video encoding mode for a macroblock in the SKIP mode and comparing this cost with other modes. This invention avoids sub-pixel interpolations for fractional pixels. This invention models the cost function in a quadratic model and computes the cost for a nearest integer pel and plural adjacent integer pels. This permits determination of the coefficients of the quadratic model. An estimated cost is obtained using the actual fractional pel position in the quadratic model. This method can be used for obtaining the cost of a P Skip mode. This method can be used for the decision of B direct or B skip modes in B frames.07-16-2009
20100104014Method and apparatus for decoding/encoding a video signal - A method of decoding a video signal is disclosed. The present invention includes obtaining identification information indicating whether a coded picture of a current NAL unit is an inter-view picture group, obtaining interview reference information of the inter-view picture group, and constructing a reference picture list for inter-view prediction using the inter-view reference information according to the identification information, wherein the inter-view reference information includes view identification information of an inter-view reference picture.04-29-2010
20100104013MULTIPLEXING CONTROL UNIT - Provided is a multiplexing control unit operable to execute multiplex (MUX) and demultiplex (DEMUX), and enhanced in its processing performance. The multiplexing control unit includes a transport stream (TS) buffer, a multiplex-processing part, a video buffer and an audio buffer. When supplied with coded video and audio data from video and audio buffers, the multiplex-processing part conducts MUX, and on the other executes DEMUX on TS data stored in the TS buffer thereby to produce coded video and audio data. MUX and DEMUX processes by the multiplex-processing part are executed in sets of more than one frame processed according to moving-picture compression coding. Before start of execution of the process, whether or not the requirement of preparation for the execution is satisfied is judged inside the device, in which the judgment is made by checking storing states of the buffers.04-29-2010
20090154561Compressed video data stream switching method - According to the method, the second data stream is modified prior to transmission, by a replacement of the bidirectional pictures with bidirectional commutation pictures of which the pictures blocks have a null residue and a null motion vector which is either forward or backward, according to the position of the blocks in the picture.06-18-2009
20090154560VIDEO CODEC WITH SHARED INTERPOLATION FILTER AND METHOD FOR USE THEREWITH - A video processing device operates in an encoding mode when a mode selection signal has a first value and operates in a decoding mode when the mode selection signal has a second value. The video processing device utilizes an interpolation filter to perform an encoding function in the encoding mode and to perform a decoding function in a decoding mode.06-18-2009
20100040145VIDEO ENCODING/DECODING METHOD AND APPARATUS - A video encoding method comprises selecting one combination, for each block of an input video signal, from a plurality of combinations each including a predictive parameter and at least one reference picture number determined in advance for the reference picture, generating a prediction picture signal in accordance with the reference picture number and predictive parameter of the selected combination, generating a predictive error signal representing an error between the input video signal and the prediction picture signal, and encoding the predictive error signal, information of the motion vector, and index information indicating the selected combination.02-18-2010
20100040144VIDEO ENCODING/DECODING METHOD AND APPARATUS - A video encoding method comprises selecting one combination, for each block of an input video signal, from a plurality of combinations each including a predictive parameter and at least one reference picture number determined in advance for the reference picture, generating a prediction picture signal in accordance with the reference picture number and predictive parameter of the selected combination, generating a predictive error signal representing an error between the input video signal and the prediction picture signal, and encoding the predictive error signal, information of the motion vector, and index information indicating the selected combination.02-18-2010
20100142616BI-DIRECTIONAL VIDEO COMPRESSION FOR REAL-TIME VIDEO STREAMS DURING TRANSPORT IN A PACKET SWITCHED NETWORK - A method, a system and a computer device for initiating bi-directional compression of a video stream in a packet switched network, based on delay tolerance of a service or application. A video frame recompression (VFR) utility determines an end-to-end (E2E) delay tolerance retrieved from a Real-time Transport Control Protocol (RTCP) report. The VFR utility then determines the actual expected delay based on a deep inspection of packet headers. The VFR utility utilizes a processing opportunity delay (which determines whether the E2E delay tolerance is greater than the actual expected delay) to reprocess video content comprising Intra-coded (I) pictures/frames and Predicted (P) frames to improve compression efficiency. The VFR utility may also utilize a complexity ratio which is a ratio of the I-Frame rate and the P-Frame rate to select frames for compression. The VFR utility recompresses video content by replacing P-Frames with B-Frames.06-10-2010
20100329338LOW COMPLEXITY B TO P-SLICE TRANSCODER - A system and method for transcoding compressed multimedia video is described. Particularly, a system and method for converting Bi-Predictive frame to transcoded Predictive frames, is disclosed. Present embodiments accomplish this conversion with minimal additional error, thereby providing an efficient means for maintaining video quality even after transcoding.12-30-2010
20130051471IMAGE FRAME INTERPOLATION METHOD AND APPARATUS - An image frame interpolation method and apparatus for determining an object and a background according to a degree of similarity between corresponding areas of a first image frame and a second image frame used for interpolation in every predetermined data unit of a third image frame interpolated between the first image frame and the second image frame and interpolating an object area of the third image frame by using object areas existing in original image frames.02-28-2013
20090304082EXTRACTING FEATURES OF VIDEO & AUDIO SIGNAL CONTEN TO PROVIDE RELIABLE IDENTIFICATION OF THE SIGNALS - Signatures that can be used to identify video and audio content are generated from the content by generating measures of dissimilarity between features of corresponding groups of pixels in frames of video content and by generating low-resolution time-frequency representations of audio segments. The signatures are generated by applying a hash function to intermediate values derived from the measures of dissimilarity and to the low-resolution time-frequency representations. The generated signatures may be used in a variety of applications such as restoring synchronization between video and audio content streams and identifying copies of original video and audio content. The generated signatures can provide reliable identifications despite intentional and unintentional modifications to the content.12-10-2009
20090304081CODING DEVICE AND METHOD FOR SCALABLE ENCODING OF MOVIE CONTAINING FIELDS - A coding device (D12-10-2009
20090304080METHOD FOR CODING AN IMAGE SEQUENCE - The method comprises the steps for the: 12-10-2009
20130070851INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.03-21-2013
20130058413METHODS AND APPARATUS FOR UNI-PREDICTION OF SELF-DERIVATION OF MOTION ESTIMATION - Methods and apparatus are provided for uni-prediction of self-derivation of motion estimation. An apparatus includes a video encoder for encoding at least a portion of a picture. The video encoder includes a self derivation motion estimator for performing self derivation motion estimation for the portion. The self derivation motion estimation is used for selectively performing uni-prediction or bi-prediction for the portion based on one or more criterion.03-07-2013
20090268818METHOD AND SYSTEM FOR INTEGRATING NOISE FILTERING IN PREDICTIVE VIDEO CODING - A method and system are disclosed for coding and filtering video data. The method comprises the steps of using a predictive coding technique to compress a stream of video data, integrating a noise filtering process into said predictive coding technique, and using said noise filtering process to noise filter said stream of video data while compressing said stream of video data. In the preferred embodiment of the invention, the stream of video data is comprised of a series of macroblocks, including a current macroblock and at least one reference macroblock. Also, in this preferred embodiment, the step of using a predictive coding technique includes the step of calculating the difference between the current macroblock and the at least one reference macroblock, and the step of integrating the noise filtering process includes the step of integrating the noise filtering process into said step of calculating. The invention may be used with a forward predictive code mode and with a bi-directional predictive mode.10-29-2009
20090067499Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 0 motion vector of the co-located block in a first reference picture if the co-located block has the list 0 motion vector and a list 1 motion vector. The first reference picture is a type of reference picture permitted to be located temporally before or after the current picture. The method further includes scaling the selected list 0 motion vector based on temporal distance between the current picture and the first reference picture, and deriving at least one motion vector of the bi-predictive block by applying a bit operation to the scaled motion vector.03-12-2009
20090067497Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 03-12-2009
20130064297ENCODING APPARATUS AND DECODING APPARATUS - An encoding apparatus having a direct mode as a prediction mode, when a pixel with opposite parity from a top field to a bottom field, for example, is referred to for obtaining a reference vector in the direct mode, performs correction by adding or subtracting a value corresponding to a half pixel to or from a value of the obtained reference vector. The encoding apparatus, when a pixel with opposite parity is referred to for obtaining a first and a second direct vector by temporally scaling the corrected reference vector, performs correction by adding or subtracting a value corresponding to a half pixel to or from values of the obtained direct vectors.03-14-2013
20090232212Adaptive Interpolation in Image or Video Encoding - A method processes and transmits of data in which image data of an image in the transmitter are provided at a first resolution level and at a second resolution level, higher than the first resolution level. At least one interpolation parameter is fixed, for the determination of image data of the second resolution level form image data of the first resolution level. At least some of the image data of the first and the second resolution levels are transmitted, whereby the transmission of the image data the second resolution level depends on at least one fixed interpolation parameter. Furthermore, a definition of the at least one fixed interpolation parameter is transmitted.09-17-2009
20120230408Parsing Friendly and Error Resilient Merge Flag Coding in Video Coding - Methods and apparatus for parsing friendly and error resilient merge flag coding in video coding are provided. In some methods, in contrast to merging candidate list size dependent coding of the merge flag in the prior art, a merge flag is always encoded in the encoded bit stream for each inter-predicted prediction unit (PU) that is not encoded using skip mode. In some methods, in contrast to the prior art that allowed the merging candidate list to be empty, one or more zero motion vector merging candidates formatted according to the prediction type of the slice containing a PU are added to the merging candidate list if needed to ensure that the list is not empty and/or to ensure that the list contains a maximum number of merging candidates.09-13-2012
20090010334DECODING DEVICE, DECODING METHOD, RECORDING MEDIUM, AND PROGRAM - A slice decoder control circuit sequentially supplies the parameter of the picture layer and the write pointer of a first slice to a first slice decoder, the parameter of the picture layer and the write pointer of a second slice to a second slice decoder, and the parameter of the picture layer and the write pointer of a third slice to a third slice decoder, and causes the slice decoders to decode the respective parameters and write pointers. On the basis of the input of signals indicating the completion of decoding processing inputted from the slice decoders, the slice decoder control circuit supplies the write pointer of a fourth slice to the second decoder and causes the second slice decoder to decode the write pointer at timing A, and supplies the write pointer of a fifth slice to the third decoder and causes the third slice decoder to decode the write pointer at timing B. Subsequently, the similar processing is repeated until the last slice is decoded. The operations of a plurality of slice decoders are thus controlled.01-08-2009
20090213932BIDIRECTIONAL PREDICTED PICTURES OR VIDEO OBJECT PLANES FOR EFFICIENT AND FLEXIBLE CODING - A method is provided for decoding a bit stream representing an image that has been encoded The method includes the steps of: performing an entropy decoding of the bit stream to form a plurality of transform coefficients and a plurality of motion vectors; performing an inverse transformation on the plurality of transform coefficients to form a plurality of error blocks; determining a plurality of predicted blocks based on bidirectional motion estimation that employs the motion vectors, wherein the bidirectional motion estimation includes a direct prediction mode and a second prediction mode; and, adding the plurality of error blocks to the plurality of predicted blocks to form the image. The second prediction mode may include forward, backward, and interpolated prediction modes.08-27-2009
20130163669METHOD AND APPARATUS FOR PROCESSING A VIDEO SIGNAL - The present invention relates to a method and apparatus for encoding or decoding a video signal. According to the present invention, a plurality of reference units for image prediction of the current unit is acquired and combined to obtain a unit prediction value, thereby improving the accuracy of image prediction. More particularly, the present invention relates to a method for inducing a variety of reference units using a motion vector prediction value or a motion vector which is used in conventional inter-prediction, and also relates to a method which combines the reference units so as to obtain the prediction value for the current unit. In addition, the present invention relates to a method which involves acquiring a plurality of reference units for a merging mode, and combining the reference units so as to perform image prediction.06-27-2013
20090110073Enhancement layer residual prediction for bit depth scalability using hierarchical LUTs - A scalable video bitstream may have an H.264/AVC compatible base layer and a scalable enhancement layer, where scalability refers to color bit-depth. According to the invention, BL information is bit-depth upsampled using separate look-up tables for inverse tone mapping on two or more hierarchy levels, such as picture level, slice level or MB level. The look-up tables are differentially encoded and included in header information. Bit-depth upsampling is a process that increases the number of values that each pixel can have, corresponding to the pixels color intensity. The upsampled base layer data are used to predict the collocated enhancement layer, based on said look-up tables. The upsampling is done at the encoder side and in the same manner at the decoder side, wherein the upsampling may refer to temporal, spatial and bit depth characteristics. Thus, the bit-depth upsampling is compatible with texture upsampling.04-30-2009
20110103479INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.05-05-2011
20090010333Method and Apparatus for Constrained Prediction for Reduced Resolution Update Mode and Complexity Scalability in Video Encoders and Decoders - There are provided methods and apparatus for constrained prediction for reduced resolution update mode and complexity scalability in video encoders and decoders. A scalable complexity video encoder includes an encoder for encoding a block in a particular picture in the video sequence by generating an intra mode prediction for the block using a constrained intra prediction process that reduces artifacts for both low and high resolutions in a reduced resolution update mode when the particular picture is eventually decoded. The constrained intra prediction process reduces the artifacts by prohibiting the use of particular prediction modes associated with the introduction of the artifacts in the reduced resolution update mode.01-08-2009
20090147850Methods and apparatus for decoded picture buffer (DPB) management in single loop decoding for multi-view video - There are provided methods and apparatus for decoded picture buffer (DPB) management in single loop decoding for multi-view video. An apparatus includes a decoder (06-11-2009
20110280307Video and Graphics System with Video Scaling - A video and graphics system has a reduced memory mode in which video images are reduced in half in horizontal direction during decoding. The video and graphics system includes a video decoder for decoding MPEG-2 video data. The video images may not be downscaled in the horizontal direction when no bi-directionally predicted pictures are used. The video and graphics system may output an HDTV video while converting the HDTV video and providing as another output having an SDTV format or another HDTV format. The output having an SDTV format may be recorded using a video cassette recorder (VCR) while the HDTV video is being displayed.11-17-2011
20090310678IMAGE ENCODING APPARATUS, METHOD OF CONTROLLING THE SAME AND COMPUTER PROGRAM - An image encoding apparatus that performs intra-frame predictive encoding is provided. The apparatus includes a partitioning unit configured to partition an inputted macroblock into blocks as processing units, an encoding unit configured to encode each of blocks to be processed using a prediction value for each pixel contained in the block to be processed, the prediction value being calculated by referring to pixels contained in other blocks, and a sorting unit configured to sort the encoded blocks in a predetermined encoding order. The encoding unit starts encoding in an order in which the first block for which all the pixels to be referred to are available for calculation of the prediction value is the first to be encoded, and the encoding is performed by pipeline processing.12-17-2009
20120189058SINGLE REFERENCE PICTURE LIST CONSTRUCTION FOR VIDEO CODING - The example techniques described in this disclosure provide for an efficient manner to encode or decode a video block of a picture using a single reference picture list. The single reference picture list may include identifiers for reference picture or pictures used to encode or decode the video block. In some examples, a video encoder or decoder may encode or decode a video block that is predicted from two reference pictures using the single reference picture list, and encode or decode a video block that is predicted from one reference picture using the same, single reference picture list.07-26-2012
20120189056Video Coding Redundancy Reduction - Embodiments for reducing redundancy in video coding are disclosed. In accordance with at least one embodiment, video content is represented as a tree structure in which the nodes of the tree structure are associated with attributes of the video content. An encoder analyzes the nodes to determine whether there is redundancy associated with a last node of a divided node. In another embodiment, bidirectional prediction video coding techniques are applied to the video content. The encoder analyzes two lists of reference frames to determine whether a third mode of bidirectional prediction is redundant to a second mode of bidirectional prediction. The efficiency of video coding is improved by refraining from sending data symbols to the decoder in the event that the video coding techniques contain redundancy.07-26-2012
20120099650METHOD AND APPARATUS FOR VARIABLE ACCURACY INTER-PICTURE TIMING SPECIFICATION FOR DIGITAL VIDEO ENCODING - A method and apparatus for variable accuracy inter-picture timing specification for digital video encoding is disclosed. Specifically, the present invention discloses a system that allows the relative timing of nearby video pictures to be encoded in a very efficient manner. In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The display time difference is then encoded into a digital representation of the video picture. In a preferred embodiment, the nearby video picture is the most recently transmitted stored picture. For coding efficiency, the display time difference may be encoded using a variable length coding system or arithmetic coding. In an alternate embodiment, the display time difference is encoded as a power of two to reduce the number of bits transmitted.04-26-2012
20110293008Moving Picture Encoding Method and Decoding Method - A moving picture decoding method including a prediction mode, including: in said prediction mode, in which prediction mode motion vector information of a current block in a current frame is not transmitted from an encoding side; selecting, from among multiple candidate reference frames, a frame(s) to be referenced to in the prediction mode; determining motion vector information to be used in the prediction mode, and performing prediction processing using the selected reference frame and the determined motion vector, wherein when candidate blocks within a current frame and adjacent to a current block include blocks that use forward reference frames and blocks that use backward reference frames, a forward reference frame having a smallest index number is selected as the forward reference frame for the current block from the forward reference frames that said blocks using the forward reference frames have, and a backward reference frame having a smallest index number is selected as the backward reference frame for the current block from the backward reference frames that said blocks using the backward reference frames have.12-01-2011
20090067496Method and Apparatus for Coding Interlaced Video Data - Often hierarchical bi-directionally predicted frame structures are used for encoding a video picture sequence. The frames may consist of interlacing fields. A method for encoding interlaced video, wherein inter-prediction of fields is used and reference lists are assigned to the fields for indicating reference frames or fields, comprises that, if within such reference list a reference to another frame is included, then references to both fields of the other frame are included separately in direct sequence. Further, a temporal level is assigned to each of the frames according to their display order, and for the frames of all except one temporal level the quantization parameter is higher for one type of fields than for the other type of fields.03-12-2009
20110007803DIFFERENT WEIGHTS FOR UNI-DIRECTIONAL PREDICTION AND BI-DIRECTIONAL PREDICTION IN VIDEO CODING - In one aspect of this disclosure, techniques are described for the decoupling of uni-directional and bi-directional prediction weights, particularly for explicit weighted predictions of video blocks within a B-unit. According to this disclosure, explicit weights communicated in the bitstream may be applied by a decoder for explicit bi-directional prediction, but different weights (which may be default weights or separately defined explicit unidirectional weights) may be used for explicit uni-directional prediction. The described techniques may improve video quality relative to techniques that use the same explicit weights for explicit bi-directional prediction and explicit uni-directional prediction within a B-unit.01-13-2011
20100014586FRAME DECIMATION THROUGH FRAME SIMPLICATION - System and method of providing improved signal compression using frame decimation through frame simplification and generating an encoded bitstream of video frames therefrom are disclosed. The encoding method comprises zeroing a difference frame generated by an encoder by using a feedback loop that injects a reconstructed frame, generated by the encoder of the difference frame, as a next frame of the video frames to be processed by the encoder. The encoding system comprises an input configured to provide a stream of video frames; a first process configured to generate a difference frame, and a second process configured to generate a reconstructed frame. A feedback loop of the system is configured to inject a generated reconstructed frame from the second process of a generated difference frame from the first process as a next frame of the video frames in the stream to be processed into the encoded bitstream by the encoding system.01-21-2010
20100014587Interpolation of Video Compression Frames - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.01-21-2010
20100034268IMAGE CODING DEVICE AND IMAGE DECODING DEVICE - There is a problem of increasing image quality deterioration when selection of an intra prediction mode for a face outline portion is not correct at a low bit-rate. This invention includes: a face detection unit detecting a face image from an input picture; and an intra prediction mode control unit controlling intra prediction mode selection based on a result of the detection of the face detection unit. In the control of intra prediction mode selection, an intra prediction mode is selected based on where a current block is positioned in a region of the face image. Thereby, an appropriate intra prediction mode can be selected for the face outline portion. As a result, image quality deterioration on the face image at a low bit-rate can be prevented.02-11-2010
20100208819CLIENT-SIDE WATERMARKING USING HYBRID I-FRAMES - A system and method for client-side watermarking of digital content using hybrid Intra-Frames (I-Frames) are provided. In general, a content source provides a compressed video stream and a hybrid I-Frame stream to a client device via a network. The hybrid I-Frame stream includes a number of low-loss I-Frames corresponding to select ones of the I-Frames in the compressed video stream to be used for client-side watermarking. The client device watermarks the I-Frames in the hybrid I-Frame stream, optionally compresses the watermarked I-Frames, and replaces the select ones of the I-Frames in the compressed video stream with the watermarked and optionally compressed I-Frames to provide a watermarked version of the compressed video stream.08-19-2010
20100278266METHOD OF GENERATING IMAGE DATA - Search is performed on Intra 16 to obtain a prediction mode leading to a minimum cost, and the minimum cost in Intra 16 and a corresponding prediction mode are stored. Search is performed on Intra 8 to obtain a prediction mode leading to a minimum cost, and then a relationship of magnitude between the stored minimum cost in Intra 16 and the minimum cost in Intra 8 is judged. After that, the minimum cost in Intra 8 and a corresponding prediction mode are stored, and search is performed on Intra 4 to obtain a prediction mode leading to a minimum cost. A relationship of magnitude between cost_intra and the minimum cost in Intra 4 is judged, and Intra 4 is determined as an optimum prediction mode in a case where Intra 4 is smaller.11-04-2010
20100118957Video Image Compression Using Unequal Weights - Techniques for video image compression in a video system involve providing a sequence of frames including picture regions, and determining first unequal weights, in which the first unequal weights are used to determine pixel luminance values of a picture region of at least one of the frames. The techniques involve determining second unequal weights, where the second unequal weights are used to determine pixel chroma values of the picture region of at least the one frame. The first unequal weights can include AC weights, and the second unequal weights can include DC weights. A representation of pixel luminance values can differ from a representation of pixel chroma values. The techniques for determining the first unequal weights can involve accessing representative transformations for the pixel luminance values, and the techniques for determining the second unequal weights can involve accessing representative transformations for the pixel chroma values.05-13-2010
20090207914METHOD FOR DIRECT MODE ENCODING AND DECODING - Disclosed is a method of encoding a direct mode when coding moving images, the method includes finding a prediction and a cost for each of a plurality of direct modes including a backward-based temporal direct mode and a forward-based temporal direct mode with respect to a current block to be encoded and determining one mode having the lowest cost as a result of comparing the costs as an optimal encoding mode, thereby performing encoding the direct mode.08-20-2009
20110200106VIDEO SIGNAL PROCESSING - Techniques relating to a video signal processing are provided. In one embodiment, a video signal encoder includes a pre-processor adapted to select a portion of an input video signal and partition the portion into partitions, a first transformer adapted to transform the partitions from a first domain into a second domain, a selector adapted to select representative values from the respective partitions of the second domain, a collector adapted to collect the representative values to form a representative group of values, and a first encoding unit adapted to encode the representative group.08-18-2011
20090074064Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 03-19-2009
20110206123BLOCK TYPE SIGNALLING IN VIDEO CODING - In one example, this disclosure describes video encoding and decoding techniques applicable to bi-directional prediction. For signaling from an encoder to a decoder a block type for a video block, an encoder can transmit to the decoder two or more separate syntax elements, where one of the two or more separate syntax elements identifies a partition size for the video block and another of the two or more separate syntax elements identifies a prediction direction for a partition of the video block. The separate syntax elements can be individually encoded and transmitted from the encoder to the decoder.08-25-2011
20110268189METHOD AND APPARATUS TO PRIORITIZE VIDEO INFORMATION DURING DOCING AND DECODING - A method and apparatus prioritizing video information during coding and decoding. Video information is received and an element of the video information, such as a visual object, video object layer, video object plane or keyregion, is identified. A priority is assigned to the identified element and the video information is encoded into a bitstream, such as a visual bitstream encoded using the MPEG-4 standard, including an indication of the priority of the element. The priority information can then be used when decoding the bitstream to reconstruct the video information11-03-2011
20120294363METHOD AND APPARATUS FOR ENCODING/DECODING IMAGES USING A MOTION VECTOR OF A PREVIOUS BLOCK AS A MOTION VECTOR FOR THE CURRENT BLOCK - An encoding method and apparatus and a decoding method and apparatus for determining a motion vector of a current block based on a motion vector of at least one previously-encoded or previously-decoded block are provided. The decoding method includes: decoding information regarding a prediction direction from among a first direction, a second direction, and bi-directions, and information regarding pixel values of the current block; determining the prediction direction in which the current block is to be predicted, based on the decoded information regarding the prediction direction, and determining a motion vector for predicting the current block in the determined prediction direction; and restoring the current block, based on the determined motion vector and the decoded information regarding the pixel values, wherein the first direction is a direction from a current picture to a previous picture, and the second direction is a direction from the current picture to a subsequent picture.11-22-2012
20090003444METHOD AND APPARATUS FOR VIDEO ENHANCEMENT BY REORGANIZING GROUP OF PICTURES - A method and apparatus for video enhancement by selectively reorganizing a group of pictures (GOP). The method includes counting the number of error blocks of a current frame to be decoded from among a plurality of frames included in the GOP; determining whether to display the current frame and one or more subsequent frames in accordance with the number of error blocks; and reorganizing a GOP with frames determined to be displayed and displaying the reorganized GOP.01-01-2009
20100128787Method and apparatus for decoding/encoding a video signal - The method includes the steps of receiving the multiview video data stream including a random access picture including a random access slice, the random access slice referencing only slice corresponding to a same time and a different view of the random access picture, obtaining initialization information of a reference picture list for the random access slice, the initialization information representing a reference relation for a single direction or a bi-direction between a plurality of views with view number information and view identification information, obtaining type information indicating whether the random access slice is predicted for a single direction or a bi-direction, initializing the reference picture list using the view number information and the view identification information according to the type information, obtaining a difference value from the a multi-view video data stream according to the type information, the difference value representing a residual of inter-view reference index in the initialized reference picture list, determining an assignment modification value for modifying the inter-view reference index in the initialized reference picture list according to the difference value, modifying the initialized reference picture list for inter-view prediction using the determined assignment modification value, determining a prediction value of a macroblock in the random access picture based on the modified reference picture list, and decoding the macroblock using the prediction value, wherein the initialization information is obtained based on a value indicating decoding order between the plurality of views.05-27-2010
20080279278METHOD OF DOUBLING FRAME RATE OF VIDEO SIGNALS - A method for doubling the frame rate of video signals creates an interpolated video frame using a current frame and a previous frame. First, the current frame is sequentially received. The interpolated frame is inserted between a previous frame and the current frame, in which values for each pixel in the interpolated frame are derived from a first reference pixel in the current frame biased by a positively weighted difference between the first reference pixel and a second reference pixel in the previous frame.11-13-2008
20080279277METHODS AND SYSTEMS FOR PERFORMING IMAGE PROCESSING UPON PIXEL DATA AND LOADING PIXEL DATA IN PARALLEL - A method for performing a specific image processing upon data loaded in a memory unit. The method includes loading non-overlapping pixel data of a second image processing range in a second reference frame into the memory unit, wherein the non-overlapping pixel data are pixel data not within an overlapped area of the first and second image processing ranges; and before the non-overlapping pixel data are completely loaded into the memory unit, start performing the specific image processing upon overlapping pixel data of first and second image processing ranges in a first reference frame.11-13-2008
20080205522Moving picture coding method, and moving picture decoding method - A moving picture coding apparatus (08-28-2008
20120033735INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.02-09-2012
20120033734INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.02-09-2012
20110007805RECORDING MEDIUM HAVING RECORDED THEREON CODED INFORMATION USING PLUS AND/OR MINUS ROUNDING OF IMAGES - Image decoder including: a memory to store a previously-decoded reference image; and a synthesizer to receive an encoded bitstream including information of I and P frames, and execute motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and the reference image. The motion compensation includes calculating intensity values at points where no pixels actually exist by bilinear interpolation performable using a positive and negative rounding method. The bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame, where such is included in a header section of the coded information of the current frame; and wherein the rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.01-13-2011
20110007802NON-ZERO ROUNDING AND PREDICTION MODE SELECTION TECHNIQUES IN VIDEO ENCODING - In one aspect of this disclosure, rounding adjustments to bi-directional predictive data may be purposely eliminated to provide predictive data that lacks any rounding bias. In this case, rounded and unrounded predictive data may both be considered in a rate-distortion analysis to identify the best data for prediction of a given video block. In another aspect of this disclosure, techniques are described for selecting among default weighted prediction, implicit weighted prediction, and explicit weighted prediction. In this context, techniques are also described for adding offset to prediction data, e.g., using the format of explicit weighted prediction to allow for offsets to predictive data that is otherwise determined by implicit or default weighted prediction.01-13-2011
20120195381IMAGE PROCESSING APPARATUS AND METHOD FOR PROCESSING IMAGE - An image processing apparatus includes a subsampling circuit to generate a subsampled image based on a sampling position of each frame of an input image; a control circuit to assign a frame at a sampling position which is substantially the same as a sampling position of a frame to be encoded as a reference frame based on information of the sampling position of each frame and a structure of a group of pictures; and an encoder to encode the frame to be encoded by compressing the frame to be encoded using inter-frame prediction based on a subsampled image of the frame to be encoded and the reference frame.08-02-2012
20080240241FRAME INTERPOLATION APPARATUS AND METHOD - A first motion vector points from a source region of a source picture to a destination region of a destination picture. A second motion vector is scaled from the first motion vector based on a first temporal distance between the source picture and the interpolation picture. A third motion vector is scaled from the first motion vector based on a second temporal distance between the destination picture and the interpolation picture. A weight of a first interpolation region of the interpolation picture is calculated using distortion energy of the source region. A first motion compensation picture compensated from the source region to a temporal position of the interpolation picture using the second motion vector, and a second motion compensation picture compensated from the destination region to the temporal position using the third motion vector are calculated. A third motion compensation picture is calculated by weighted-averaging the first motion compensation picture and the second motion compensation picture. A second interpolation region of the interpolation picture is calculated by averaging a region of the third motion compensation picture and a region of an artifact prevention picture with the weight.10-02-2008
20100150240REFERENCE PICTURE SELECTION METHOD AND APPARATUS - The reference picture selection method according to the present invention is a method for selecting a reference picture for a current bottom field, and includes: predicting a degree of a motion of the current bottom field using a specific field which precedes the current bottom field in coding order; setting reference picture candidates suitable for coding the current bottom field based on the predicted degree of motion; and selecting a reference picture of the current bottom field among the set reference picture candidates.06-17-2010
20090129469CODING APPARATUS, CODING METHOD, AND CODING SYSTEM - A first prediction unit performs intra-prediction of an original image corresponding to an inter-frame coded frame to produce a first prediction residual and a prediction parameter. A second prediction unit performs intra-prediction of local decode data corresponding to the inter-frame coded data with the prediction parameter to produce a second prediction residual. A subtractor calculates difference data between the first prediction residual and the second prediction residual. A third prediction unit performs intra-prediction of data corresponding to a decoded frame with the prediction parameter to produce a third prediction residual, when the inter-frame coded data is decoded and transformed into the intra-frame coded data. An adder calculates addition data of the third prediction residual and the differential data. An intra-frame coding unit performs intra-frame coding to the addition data.05-21-2009
20090003445Method and Apparatus for Constructing Reference Picture Lists for Scalable Video - In video coding, prediction of P- and B-frames is based on reference frames, which are indicated by reference picture lists. Scalable video coding (SVC) requires this for both, base-layer and enhancement-layer. The invention describes a decoding process for reference picture list construction for spatial enhancement layer. With just one flag of syntax modification, it provides simpler and direct reference lists construction process. By using this, complicated RPLR and other syntaxes can be skipped, and the RPLR process for spatial enhancement layer can also be avoided. The process also can be used as for error concealment when the spatial enhancement layer slice is lost.01-01-2009
20090274213APPARATUS AND METHOD FOR COMPUTATIONALLY EFFICIENT INTRA PREDICTION IN A VIDEO CODER - A computer readable storage medium has executable instructions to select a plurality of blocks in a video sequence to be coded as intra-coded blocks. Intra prediction modes are selected for all intra-coded blocks in a macroblock based on original pixels of neighboring blocks. The mode selection of all intra-coded blocks can be conducted in parallel. The intra-coded blocks in the macroblock are predicted with the selected intra prediction modes based on reconstructed pixels of neighboring blocks.11-05-2009
20090052537METHOD AND DEVICE FOR PROCESSING CODED VIDEO DATA - The present invention relates to a method of processing digital coded video data available in the form of a video stream consisting of consecutive frames divided into slices. The frames include at least I-frames, coded without any reference to other frames, P-frames, temporally disposed between said I-frames and predicted from at least a previous I- or P-frame, and B-frames, temporally disposed between an I-frame and a P-frame, or between two P-frames, and bidirectionally predicted from at least these two frames between which they are disposed. The processing method comprises the steps of determining for each slice of the current frame related slice coding parameters and parameters related to spatial relationships between the regions that are coded in each slice, collecting said parameters for all the successive slices of the current frame, for delivering statistics related to said parameters, analyzing said statistics for determining regions of interest (ROIs) in said current frame, and enabling a selective use of the coded data, targeted on the regions of interest thus determined.02-26-2009
20090097559Method and System for Processing B Pictures with Missing or Invalid Forward Reference Pictures - Methods and systems for processing B pictures with missing or invalid forward reference pictures are disclosed. Aspects of one method may include decoding of a contiguous sequence of B pictures that immediately follow a first I picture after a sequence header. The decoding of the B pictures may handle video edit codes in the AVS1-P2 format and/or random access points. Some embodiments of the invention may discard B pictures that refer to invalid or missing forward reference pictures, while other embodiments of the invention may interpolate B pictures. For an invalid forward reference picture, the interpolation algorithm for generating pictures may use the invalid forward reference picture and the backward reference picture. For a missing decoded forward reference picture, as in a random access, the interpolation algorithm for generating pictures may use the backward reference picture.04-16-2009
20090080524VIDEO DECODING APPARATUS AND VIDEO DECODING METHOD - According to one embodiment, a video decoding apparatus which decodes a compression-coded video stream, includes an error detection module configured to detect an error in a syntax values decoded by a decoding module, and an error concealment processing module configured to execute, in the case where the picture to be decoded whose error has been detected by the error detection module is an inter-frame prediction picture for which motion compensation prediction processing is performed, error concealment processing of rewriting the syntax values of the macroblock in which an error has been detected and its subsequent macroblocks so as to estimate, from information of the inter-frame prediction picture or data of macroblocks that have been decoded, data of the macroblock in which an error has been detected and its subsequent macroblocks.03-26-2009
20130215966IMAGE ENCODING METHOD, IMAGE DECODING METHOD, IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE - A method including acquiring decode information of a decoded block in a decode target image from a storage unit; selecting an decoded image such that the decode target image is situated between the decoded image and a reference image of the decoded image; acquiring, from the storage unit, decode information of a predetermined block in the selected decoded image; predicting a reference mode indicating a prediction direction of a decode target block that refers to decoded images in plural directions, by using the acquired decode information of the decoded block and decode information of the predetermined block; decoding reference mode information for determining the reference mode of the decode target block from encode data; and determining the reference mode of the decode target block from the predicted reference mode and the decoded reference mode information.08-22-2013
20090175341Method of decoding a macroblock based on a macroblock level of the macroblock - The method includes obtaining a first reference frame picture list and a second reference frame picture list including multiple reference frame pictures respectively. A reference frame picture index is determined based on display order information for the multiple reference frame pictures. First motion vector information and second motion vector information for the macroblock is obtained and a first reference field picture index and a second reference field picture index associated with the macroblock is obtained. The method further includes selecting a first reference field picture having a same parity as the macroblock if the first reference field picture index is an even number, and selecting a second reference field picture having a different parity from the macroblock if the second reference field picture index is an odd number. The macroblock is decoded based on the first and second motion vector information and the selected first and second reference field pictures.07-09-2009
20090220003METHOD OF COMPRESSING VIDEO DATA AND A MEDIA PLAYER FOR IMPLEMENTING THE METHOD - A method of receiving video data comprising the steps of: receiving at least one chunk of video data comprising a number of sequential key video frames where the number is at least two and, constructing at least one delta frame between a nearest preceding key frame and a nearest subsequent key frame from data contained in the either or each of the nearest preceding and subsequent frames.09-03-2009
20090257496ESTIMATION OF B FRAME AVERAGE RATE QUANTIZATION PARAMETER (QP) IN A GROUP OF PICTURES (GOP) - Rate-QP estimation for a B picture is disclosed which involves: providing an input group of pictures (GOP); selecting an input B picture within the GOP; and outputting, to a computer readable medium, a bit rate corrected Rate-QP, R(QP), for the input B picture. The outputting step may involve calculating intra/non-intra luma and chroma Rate-QP estimates from corresponding intra/non-intra luma and chroma histograms; offsetting the intra/non-intra chroma Rate-QP estimate to form respective offset intra/non-intra chroma estimates; and setting a bit rate corrected Rate-QP for the input B picture to a corrected sum of the previous estimates. The histograms are formed using an input of the lowest SATD forward, backward, and bidirectional prediction coefficients, and the intra prediction coefficients, where an intra/non-intra mode is selected, which results in a lowest SATD for each macroblock in the GOP. The methods may be implemented into a computer program, possibly resident in advanced video encoders.10-15-2009
20090245372Decoding system and method - A decoding system generates a predicted image, receives error correcting information encoding an original image, and uses the predicted image and the error correcting information to carry out a multi-stage decoding process that reconstructs the original image by correcting prediction errors in the predicted image. This process uses correlation information representing an assumed correlation between the predicted image and the original image. As the decoding process proceeds, the correlation information is updated to reflect assumed or inferred changes in the correlation between the predicted image and the original image. Updating the correlation information permits more efficient coding by enabling the original image to be reconstructed to an acceptable level of image quality with less error correcting information.10-01-2009
20090245373VIDEO CODING - Improved video coding is described to encode video data within a sequence of video frames. To this end, at least a portion of a reference frame is encoded to include motion information associated with the portion of the reference frame. At least a portion of a predictable frame that includes video data predictively correlated to said portion of said reference frame is defined based on the motion information. At least said portion of the predictable frame is encoded without including corresponding motion information and including mode identifying data. The mode identifying data indicate that the encoded portion of the predictable frame can be directly derived using at least the motion information associated with the portion of the reference frame.10-01-2009
20090252228Trick Play Using Temporal Layering - The present invention provides a method and apparatus for encoding video content into a novel temporal layered coding structure. In one embodiment of the present invention, a plurality of sub-sequence layers are defined in a layer hierarchy in accordance with the present invention. A plurality of images within a sub-sequence of a group of images are selectively assigned to a respective one of the sub-sequence layers. A grouping of images contained in any sequential combination of sub-sequence layers that includes a hierarchically lowest of the sub-sequence layers results in a group of images that temporally are substantially evenly spaced. A related method and apparatus for decoding the temporally layered video content are also disclosed.10-08-2009
20120140825Method and Apparatus of Video Coding Using Picture Structure with Low-Delay Hierarchical B Group - A method and apparatus for encoding a video sequence comprising a plurality of pictures are disclosed. In video coding systems, the temporal redundancy is exploited using motion compensated prediction. The video sequence is often organized into multiple GOP (group of pictures) where different types of GOP may be used. In conventional coding systems, IPPP and IBBP GOP structure is often used. In H.264/AVC and the emerging High Efficiency Video Coding (HEVC), hierarchical GOP structure, including hierarchical P GOP structure and hierarchical B GOP structure, has been introduced to allow temporal scalability. Furthermore, low-delay IBBB GOP structure has been also introduced, for low-delay application. In the present invention, a low-delay hierarchical B GOP structure is disclosed. The new structure uses low-delay B-pictures only so as to minimize the processing delay while the hierarchical structure provides the temporal scalability. The low-delay hierarchical B GOP structure has been shown to result in substantial improvement in coding efficiency06-07-2012
20090316783BIDIRECTIONALLY DECODABLE WYNER-ZIV VIDEO CODING - Systems and methodologies for employing bidirectionally decodable Wyner-Ziv video coding (BDWZVC) are described herein. BDWZVC can be used to generate M-frames, which have multiple reference frames at an encoder and can be forward and backward decodable. For example, optimal Lagrangian multipliers for forward and backward motion estimation can be derived and/or utilized. The optimal Lagrangian multiplier for backward motion estimation can be approximately twice as large as the optimal Lagrangian multiplier for forward motion estimation. Further, an optimal P-frame/M-frame selection scheme can be employed to enhance rate-distortion performance when video is transmitted over an error prone channel. Accordingly, a first frame in a group of pictures (GOP) can be encoded as an I-frame, a next m−1 frames can be encoded as P-frames, and a remaining n-m frames can be encoded as M-frames, where n can be a length of the GOP and m can be optimally identified.12-24-2009
20120033733INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.02-09-2012
20100177823SLOW MOTION AND HIGH SPEED FOR DIGITAL VIDEO - Presented herein are systems and methods for slow motion and high speed for digital video. In one embodiment, there is presented a method for displaying pictures. The method comprises displaying a top field from a particular picture, for a predetermined number of consecutive vertical synchronization pulses; and displaying a bottom field from the particular picture for the predetermined number of consecutive vertical synchronization pulses.07-15-2010
20130215967METHOD TO DERIVE AT LEAST ONE MOTION VECTOR OF A BI-PREDICTIVE BLOCK IN A CURRENT PICTURE - In one embodiment, the method includes selecting a list 0 motion vector of the first block in the first picture as the motion vector for deriving list 0 and list 1 motion vectors of the bi-predictive block if the first block has both a list 1 motion vector and the list 0 motion vector, the first picture being permitted to be located temporally before the current picture and permitted to be located temporally after the current picture, deriving a first temporal distance between the current picture and a reference picture of the current picture, deriving a second temporal distance between the first reference picture and a reference picture of the first picture, scaling the selected motion vector based on the first and the second temporal distances and deriving at least one motion vector of the bi-predictive block by applying a bit operation to the scaled motion vector.08-22-2013
20100220786METHOD AND APPARATUS FOR MULTIPLE REFERENCE PICTURE MOTION ESTIMATION - The claimed invention relates to efficient use of data for multiple reference picture motion estimation. Multiple reference picture motion estimation involves a large amount of data due to the processing of multiple reference pictures. The claimed invention discloses a method 09-02-2010
20100135393METHOD AND APPARATUS FOR ENCODING AND/OR DECODING VIDEO DATA USING ENHANCEMENT LAYER RESIDUAL PREDICTION FOR BIT DEPTH SCALABILITY - A scalable video bitstream may have an H.264/AVC compatible base layer and a scalable enhancement layer, where scalability refers to color bit depth. The H.264/AVC scalability extension SVC provides also other types of scalability, e.g. spatial scalability where the number of pixels in BL and EL are different. According to the invention, BL information is upsampled in two logical steps, one being texture upsampling and the other being bit depth upsampling. Texture upsampling is a process that increases the number of pixels, and bit depth upsampling is a process that increases the number of values that each pixel can have, corresponding to the pixels color intensity. The upsampled BL data are used to predict the collocated EL. The BL information is upsampled at the encoder side and in the same manner at the decoder side, wherein the upsampling refers to spatial and bit depth characteristics.06-03-2010
20100208818METHODS AND APPARATUS FOR VIDEO ENCODING AND DECODING GEOMETRICALLY PARTITIONED BII-PREDICTIVE MODE PARTITIONS - There are provided methods and apparatus for video encoding and decoding geometrically partitioned bi-predictive mode partitions. An apparatus includes an encoder for encoding bi-predictable picture data for at least a portion of a picture using adaptive geometric partitioning. Geometric partitions for the adaptive geometric partitioning are predicted using at least one predictor selected from a first set of predictors corresponding to a first list of references pictures, a second set of predictors corresponding to a second list of references pictures, and a third set of predictors used for bi-prediction and including predictors from at least one of the first and second sets.08-19-2010
20100208817BI-PREDICTION CODING METHOD AND APPARATUS, BI-PREDICTION DECODING METHOD AND APPARATUS, AND RECORDING MEDIUM - The present invention relates to a method and an apparatus of bi-prediction coding, a method and an apparatus of bi-prediction decoding and a recording medium. In accordance with the present invention, there is provided a method and an apparatus of bi-prediction coding, a method and an apparatus of bi-prediction decoding and a recording medium capable of solving a problem of complexity in implementing the bi-prediction coding of image compression and improving the coding efficiency by more efficiently transmitting a motion vector based on a fact that the movement is linearly generated.08-19-2010
20090074068Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 0 motion vector of the co-located block in a first reference picture as the motion vector if the co-located block has the list 0 motion vector and a list 1 motion vector. The first reference picture is a type of reference picture permitted to be located temporally before or after the current picture. The method further includes selecting the list 1 motion vector of the co-located block in the first reference picture if the co-located block only has the list 1 motion vector, and deriving at least one motion vector of the bi-predictive block by applying a bit operation to the selected motion vector.03-19-2009
20090074069Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 03-19-2009
20090074065Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 03-19-2009
20090074067Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 0 motion vector of the co-located block in a first reference picture as the motion vector if the co-located block has the list 0 motion vector and a list 1 motion vector. The first reference picture is a type of reference picture permitted to be located temporally before or after the current picture. The method further includes selecting the list 1 motion vector of the co-located block in the first reference picture if the co-located block only has the list 1 motion vector, and deriving at least one motion vector of the bi-predictive block based on the selected motion vector. The deriving includes deriving a first temporal distance from a difference between the current picture and the first reference picture, deriving a second temporal distance from a difference between the first reference picture and a second reference picture, and scaling the selected motion vector based on the first and second temporal distances. The second reference picture is pointed to by the selected motion vector.03-19-2009
20090074062Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 03-19-2009
20090074066Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 03-19-2009
20090074063Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting a list 03-19-2009
20090074061Method and Apparatus for Macroblock Adaptive Inter-Layer Intra Texture Prediction - There are provided scalable video encoders and decoders and corresponding methods for scalable video encoding and decoding. A scalable video encoder includes an encoder for selectively using spatial intra prediction to code, on a macroblock adaptive basis, an enhancement layer residue generated between an enhancement layer macroblock and a corresponding upsampled base layer macroblock.03-19-2009
20090180538TEMPLATE MATCHING SCHEME USING MULTIPLE PREDICTORS AS CANDIDATES FOR INTRA-PREDICTION - An apparatus and method for spatial encoding of intra-predictions for a current block of a video sequence without the need to average across a number of best template matches. The encoder identifies and sorts the best template matches for the current block within previously coded and reconstructed blocks which neighbor the current block of video. In response to determining actual predictive error for the sorted list of matches, a selector is generated identifying which of the sorted templates is optimal. The selector is then communicated for receipt by the decoder, which is adapted for performing the same template matching and sorting, which is followed by selection of the optimum candidate in response to using the selector. In response to the selector information the decoder can provide optimum template matching without the compromise or overhead of taking averages across the best template candidates.07-16-2009
20090129470IMAGE INFORMATION ENCODING APPARATUS AND IMAGE INFORMATION ENCODING METHOD, AND IMAGE INFORMATION DECODING APPARATUS AND IMAGE INFORMATION DECODING METHOD - The present invention is directed to an image information encoding apparatus, used in receiving compressed image information through network media when processing of such compressed image information is performed on storage media. A picture sorting buffer delivers information of picture type of frame Picture_type to a picture type discrimination unit. The picture type discrimination unit transmits command to a motion prediction/compensation unit on the basis of that information. The motion prediction/compensation unit generates predictive picture by using filter coefficients having the number of taps lesser than that of P picture with respect to B picture for which operation quantity and the number of memory accesses are required to more degree as compared to P picture on the basis of that command.05-21-2009
20080310508METHOD OF FRAME INTERPOLATION FOR FRAME RATE UP-CONVERSION - A method of frame interpolation for frame rate up conversion method is provided. The method includes: determining a first adjusting value and a second adjusting value according to a target pixel in at least one of a first frame and a second frame; determining an interpolated pixel value of the target pixel in an interpolated frame between the first frame and the second frame according to the first adjusting value and a pixel value of the target pixel in one of the first and second frames; and adjusting a pixel value of the target pixel in one of the first and second frames according to the second adjusting value.12-18-2008
20100296579ADAPTIVE PICTURE TYPE DECISION FOR VIDEO CODING - A video encoding apparatus determines whether to encode a key frame of a group of pictures using a bi-directional prediction mode. In one example, a video encoding apparatus includes a mode select unit configured to generate a virtual key frame for a current group of pictures based on a previous key frame of a previous group of pictures and a next key frame of a next group of pictures, calculate an error value representing error between a current key frame of the current group of pictures and the virtual key frame, and determine whether the error value exceeds a threshold value, and a video encoder configured to encode the current key frame using a bi-directional prediction encoding mode when the error value does not exceed the threshold value. The video encoder may comprise the mode select unit, or a preprocessing unit of the apparatus may comprise the mode select unit.11-25-2010
20090041123GENERALIZED SCALABILITY FOR VIDEO CODER BASED ON VIDEO OBJECTS - A video coding system that codes video objects as scalable video object layers. Data of each video object may be segregated into one or more layers. A base layer contains sufficient information to decode a basic representation of the video object. Enhancement layers contain supplementary data regarding the video object that, if decoded, enhance the basic representation obtained from the base layer. The present invention thus provides a coding scheme suitable for use with decoders of varying processing power. A simple decoder may decode only the base layer of video objects to obtain the basic representation. However, more powerful decoders may decode the base layer data of video objects and additional enhancement layer data to obtain improved decoded output. The coding scheme supports enhancement of both the spatial resolution and the temporal resolution of video objects.02-12-2009
20110007804RECORDING MEDIUM HAVING RECORDED THEREON CODED INFORMATION USING PLUS AND/OR MINUS ROUNDING OF IMAGES - Image decoding method including: receiving an encoded bitstream including information of I and P frames; and executing motion compensation by synthesizing a predicted image of a current frame using motion vector information included in the encoded bitstream and a reference image which is a previously decoded image; wherein the motion compensation includes calculating intensity values at points where no pixels actually exist in the reference image by bilinear interpolation, such being performable using a positive and negative rounding method; wherein the bilinear interpolation is performed using the rounding method specified by rounding method information included in the encoded bitstream of the current frame when the current frame is a P frame; wherein the rounding method information specifies one of a plurality of values; where such rounding method information is not received from the encoded bitstream of the current frame when the current frame is an I frame.01-13-2011
20090067500Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment the method includes selecting a list 0 motion vector of the co-located block in a first reference picture as the motion vector if the co-located block has the list 0 motion vector and a list 1 motion vector. The first reference picture is a type of reference picture permitted to be located temporally before or after the current picture. The method further includes selecting the list 1 motion vector of the co-located block in the first reference picture if the co-located block only has the list 1 motion vector, scaling the selected motion vector based on temporal distance between the current picture and the first reference picture, and deriving at least one motion vector of the bi-predicuve block by applying a bit operation to the scaled motion vector.03-12-2009
20110002388TEMPLATE MATCHING FOR VIDEO CODING - In one aspect of this disclosure, template matching motion prediction is applied to B-frames. In another aspect of this disclosure, template matching motion prediction as applied to video block coding may include generating a template offset, generating a weighted sum of absolute differences, selecting a number of hypotheses used to encode video blocks based on the cost associated with the number of hypotheses and signaling, with a new syntax, to a decoder, the number of hypotheses used in encoding, rejecting hypotheses if the difference in value between a hypothesis and a reference hypothesis is greater than a threshold value, and/or generating the content of a sub-block that does not have reconstructed data available by combining motion-compensated prediction and luma residuals.01-06-2011
20120243609BI-PREDICTIVE MERGE MODE BASED ON UNI-PREDICTIVE NEIGHBORS IN VIDEO CODING - This disclosure describes a bi-predictive merge mode in which a bi-predictive video block inherits motion information from two different neighboring blocks, wherein the two different neighboring blocks were each encoded in a uni-predictive mode. Bi-predictive coding may improve the ability to achieve compression in video coding. The described bi-predictive merge mode may increase the number of bi-predictive candidates that can be used in the context of merge mode coding by allowing two separate uni-predicted neighbors to be used to define bi-predictive motion information for a video block.09-27-2012
20110176609MULTI-FORMAT VIDEO DECODER AND RELATED DECODING METHOD - A multi-format video decoder includes a bitstream buffer, a system controller, a bitstream decoding unit, an intra mode decoding unit and a shared prediction module. The system controller selectively generates a first control signal or a second control signal according to a video bitstream. The bitstream decoding unit generates a decoding information signal according to the video bitstream when receiving the first control signal. The intra mode decoding unit generates an intra mode signal when receiving the second control signal. The shared prediction module performs an AC/DC prediction upon a current block of the video bitstream to generate a current first prediction result according to the decoding information signal and performs an intra prediction upon the current block to generate a current second prediction result according to the intra mode signal. The shared prediction module includes shared components being utilized in the AC/DC prediction and the intra prediction.07-21-2011
20110080952SYSTEM AND METHOD FOR ADAPTIVE INTRA REFRESH RATE SETTING IN A VIDEO ENCODER - A system and method for adaptive intra refresh rate setting for each video frame in a video encoder is disclosed. In one embodiment, a video encoding method includes computing channel induced distortion values at multiple intra refresh rates for a coded video frame as a function of channel loss and spatiotemporal content, computing source coding distortion values at the multiple intra refresh rates for the coded video frame as a function of the spatiotemporal content and an operating bit-rate, selecting an intra refresh rate value for one or more video frames subsequent to the encoded video frame as a function of the sum of the corresponding computed channel induced distortion values and the source coding distortion values, and encoding the one or more video frames using the selected intra refresh rate value.04-07-2011
20090028243Method and apparatus for coding and decoding with motion compensated prediction - The direct mode of motion compensation will make coding efficiency worse if the motion deviates from a linear motion model. The motion vector linear prediction unit 01-29-2009
20100246678INTRA-FRAME PREDICTION METHOD AND PREDICTION APPARATUS USING THE SAME - An intra-frame prediction method and a prediction apparatus using the same are provided. The prediction apparatus includes an input data unit, a control unit, an selection unit, a processing unit, and an output data selecting unit. The input data unit provides surroundings pixels of a predicted block. The control unit provides an input selection signal, a computing parameter, and an output selection signal. The selection unit selects the surroundings pixels according to the input selection signal. The processing unit computes the selected surroundings pixels for producing a plurality of results according to the computing signal. The output data unit selects results according to the output selection signal.09-30-2010
20110069759INTERPOLATION METHOD AND VIDEO CODEC DEVICE USING THE SAME - A video codec device to perform interpolations on a reference frame is provided. The video codec device comprises a full pixel register, an interpolation filter array, a half pixel register and a result register. The interpolation filter array performs half interpolations to generate half pixels of the reference frame to the half pixel register. The half pixels stored in the half pixel register are variable for quarter interpolations. When all the half interpolations of the reference frames are finished, the interpolation filter array performs the quarter interpolations utilizing the generated half pixels, and generates quarter pixels of the reference frames to the result register.03-24-2011
20100260263IMAGE ENCODING APPARATUS, IMAGE ENCODING METHOD, AND COMPUTER PROGRAM - An image encoding apparatus includes: a prediction preparing section which prepares a prediction for each intra-prediction mode by using at least ones of pixel signals of pixels lined horizontally in an upper end of an encoding target block and pixel signals of pixels lined vertically in a left end of the encoding target block among pixel signals of the encoding target block; and a prediction mode derivation section which execute an intra-prediction operation by using an image of the encoding target block in an encoding target image and the prediction prepared by the prediction preparing section.10-14-2010
20100086047VIDEO ENCODING/ DECODING METHOD AND APPARATUS - A video encoding method comprises selecting one combination, for each block of an input video signal, from a plurality of combinations each including a predictive parameter and at least one reference picture number determined in advance for the reference picture, generating a prediction picture signal in accordance with the reference picture number and predictive parameter of the selected combination, generating a predictive error signal representing an error between the input video signal and the prediction picture signal, and encoding the predictive error signal, information of the motion vector, and index information indicating the selected combination.04-08-2010
20120033732INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.02-09-2012
20110069758VIDEO PROCESSING APPARATUS AND METHOD - A video processing apparatus includes a decoder, a controller and a display device. The decoder decodes a bitstream, wherein the bitstream includes a plurality of groups of pictures and each group of pictures includes a frame sequence. The controller is coupled to the decoder to determine whether a current frame of a current group of pictures to be displayed has macroblocks with forward reference to a previous frame of a previous group of pictures, wherein the current group of pictures is subsequent to the previous group of pictures. The display device is coupled to the controller to display the current frame of the current group of pictures when the current frame has no macroblock with forward reference to the previous frame of the previous group of pictures.03-24-2011
20080219349Parallel processing apparatus for video compression - A method of and an apparatus for parallel processing video compression is described herein. A picture is divided into N zones vertically, and Vertical Split Parallelism (VSP) deploys N+1 processes: N M-coding processes for general macroblock coding in N zones and one E-coding process for entropy coding. By dividing a macroblock encoding process into M-coding and E-coding processes, multiple M-coding threads and one E-coding thread are able to progress simultaneously with proper synchronization between threads. Since the workload of M-coding processes is greater than E-coding for each macroblock coding process, two cores are able to be designated to the two M-coding processes. Either of the cores are able to be designated to the E-coding process since the workload of E-coding is light. Therefore, VSP utilizes parallel processing computing power efficiently.09-11-2008
20110096837INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.04-28-2011
20110096838INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.04-28-2011
20100166070LOW-RESOLUTION VIDEO CODING CONTENT EXTRACTION - Low complexity method embodiments directly decode low-resolution frames from compressed high-resolution videos that were encoded using predictive coding techniques like the H.264 video coding standard. The smaller the decoding resolution, the higher will be the computation and power savings of using the method. Low-frequency coefficients of 2D transformed predictions are added to the low-frequency coefficients of the transformed residual error. Low-frequency coefficients of the reconstructed data are then inverse transformed taking a smaller size transform. Further savings are obtained by reconstructing only those reference pixels that will be needed for accurate decoding of further Intra blocks.07-01-2010
20100158117Method and apparatus for decoding/encoding a video siganl - A method of decoding a video signal is disclosed. The present invention includes obtaining identification information indicating whether a coded picture of a current NAL unit is an inter-view picture group, obtaining interview reference information of the inter-view picture group, and constructing a reference picture list for inter-view prediction using the inter-view reference information according to the identification information, wherein the inter-view reference information includes view identification information of an inter-view reference picture.06-24-2010
20100158118Method and apparatus for decoding/encoding a video siganl - A method of decoding a video signal is disclosed. The present invention includes obtaining identification information indicating whether a coded picture of a current NAL unit is an inter-view picture group, obtaining interview reference information of the inter-view picture group, and constructing a reference picture list for inter-view prediction using the inter-view reference information according to the identification information, wherein the inter-view reference information includes view identification information of an inter-view reference picture.06-24-2010
20100195732METHOD FOR CONTROLLING VIDEO FRAME STREAM - A method for controlling video frame stream at a transmitting end of video phone is provided. The method predetermines whether receiving the current frame will cause delay based on a situation of transmitting and compression of the previous video frames. If the result of the predetermination is yes, the current video frame is skipped; if the result of the predetermination is no, the follow-up compression, multiplexing and transmitting of the current video frame are performed.08-05-2010
20090175340Method of decoding a macroblock based on a macroblock level of the macroblock - In one embodiment, the method includes obtaining a first reference frame picture list and a second reference frame picture list including multiple reference frame pictures respectively and determining a reference frame picture index based on display order information for the multiple reference frame pictures. A first reference field picture having a different parity from the macroblock is selected if the first reference field picture index is an odd number, and a second reference field picture having a same parity as the macroblock is selected if the second reference field picture index is an even number. The macroblock is decoded based on the first and second motion vector information and the selected first and second reference field pictures.07-09-2009
20090175339Method of decoding a macroblock based on a macroblock level of the macroblock - In one embodiment, the method includes obtaining a first reference frame picture list and a second reference frame picture list including multiple reference frame pictures respectively. A reference frame picture index is determined based on display order information for the multiple reference frame pictures. The method further includes obtaining first motion vector information and second motion vector information for the macroblock and obtaining a first reference field picture index and a second reference field picture index associated with the macroblock. First and second reference frame pictures are determined. A first and second reference field pictures are selected. The macroblock is decoded based on the first and second motion vector information and the selected first and second reference field pictures.07-09-2009
20100027660METHOD AND APPARATUS FOR DECODING/ENCODING A VIDEO SIGNAL - The method includes the steps of receiving the multi-view video data stream including a random access picture including a random access slice, the random access slice referencing only slice corresponding to a same time and a different view of the random access picture; obtaining random access flag for inter-view prediction, the random access flag indicating whether a type of picture is the random access picture; obtaining initialization information of a reference picture list for the random access slice based on the random access flag, the initialization information representing a reference relation between a plurality of views with view number information and view identification information; initializing the reference picture list of the random access slice using the view number information and the view identification information; determining a prediction value of a macroblock in the random access picture based on the initialized reference picture list; and decoding the macroblock using the prediction value, wherein the initialization information is obtained based on a value indicating decoding order between the plurality of views.02-04-2010
20100027659METHOD AND APPARATUS FOR DECODING/ENCODING A VIDEO SIGNAL - The method includes the steps of receiving the multi-view video data stream including a random access picture including a random access slice, the random access slice referencing only slice corresponding to a same time and a different view of the random access picture; obtaining random access flag for inter-view prediction, the random access flag indicating whether a type of picture is the random access picture; obtaining initialization information of a reference picture list for the random access slice based on the random access flag, the initialization information representing a reference relation between a plurality of views with view number information and view identification information; initializing the reference picture list of the random access slice using the view number information and the view identification information; determining a prediction value of a macroblock in the random access picture based on the initialized reference picture list; and decoding the macroblock using the prediction value, wherein the initialization information is obtained based on a value indicating decoding order between the plurality of views.02-04-2010
20100284464REDUCING COMPUTATIONAL COMPLEXITY WHEN VIDEO ENCODING USES BI-PREDICTIVELY ENCODED FRAMES - Several techniques aimed at reducing computational complexity when encoding uses bi-predictively encoded frames (B-frames) are implemented in a video encoder. In an embodiment, B-frames are not used as reference frames for encoding P-frames and other B-frames. Non-use of B-frames allows a de-blocking filter used in the video encoder to be switched off when reconstructing encoded B-frames, and use of a lower complexity filter for fractional-resolution motion search for B-frames. In another embodiment, cost functions used in motion estimation for B-frames are simplified to reduce computational complexity. In one more embodiment, fractional pixel refinement in motion search for B-frames is simplified. In yet another embodiment, predictors used in motion estimation for a macro-block in a P-frame are selected from a B-frame that uses a same reference frame as the P-frame.11-11-2010
20100128788SYSTEM AND METHOD FOR INTRA REFRESH IMPLEMENTATION WITH PSEUDO RANDOM NUMBER GENERATION - Embodiments of the present invention include a method and system for encoding video data comprising accessing a picture to be encoded, wherein the picture comprises a plurality of macro-blocks. A plurality of programmable counters is associated with each macro-block to be encoded. A counter associated with a macro-block of the plurality of macro-blocks is accessed and a value of the counter is determined. The method further includes determining whether to encode the macro-block as an Intra or non-Intra based on the value of the counter. If the macro-block is encoded as Intra, its counter is reset. If the macro-block is encoded as non-Intra, its counter value is updated. The counter value may be reset with a random number. Counters can be programmed such that a region of interest is defined for updating associated macro-blocks with greater frequency.05-27-2010
20120307900INTERPOLATION OF VIDEO COMPRESSION FRAMES - Video image decompression systems, methods, and computer-readable storage media are disclosed. Some techniques involve accessing a sequence of predicted and bidirectional predicted frames each comprising pixel values arranged in image regions, wherein at least one image region within a bidirectional predicted frame is determined using direct mode prediction based on motion vectors from two or more predicted frames, and wherein at least one such motion vector is scaled by a frame scale fraction of less than zero or greater than one.12-06-2012
20100266041ADAPTIVE MOTION ESTIMATION - Optimal error metric function for motion estimation is determined and used for video coding and/or video processing of images. To do so, an initial motion estimation using an initial error metric function can be performed. This can produce motion prediction errors. If the initial error metric function is not the optimal error function, then a final motion estimation is performed using a selected optimal error metric function. In some embodiments, a shape of error distribution can be used to determine the optimal error metric function. Some example systems or devices for this motion estimation can include systems or devices for compression, temporal interpolation, and/or super-resolution processing.10-21-2010
20110150090Video encoder - A video encoding apparatus for encoding a video stream comprising: a reference frame cache configured to cache reference frame video data retrieved from a reference frame storage unit in external memory, the reference frame video data cached in the reference frame cache being derived from an individual frame of the video stream; a first source frame storage unit configured to store a first block of unencoded video data taken from a first source frame of the video stream; a second source frame storage unit configured to store a second block of unencoded video data taken from a second source frame of the video stream; a first video encoder configured to perform a first encoding operation to encode the first block of unencoded video data with reference to the reference frame video data cached in the reference frame cache; and a second video encoder configured to perform a second encoding operation to encode said second block of unencoded video data with reference to the reference frame video data cached in the reference frame cache, wherein the first video encoder and the second video encoder are configured to perform the first encoding operation and the second encoding operation in parallel with one another.06-23-2011
20090175342Method for Determining Display Order of VOPS in Decoder End or MPEG Image System and Device for Executing the Same - Methods and systems for image processing are provided. A particular method includes receiving a video object plane (VOP) at an image processing device and decoding the received VOP. The method also includes storing an order number of the decoded VOP at a P-VOP queue in a memory of the image processing device when the received VOP is a predictive coded VOP (P-VOP). The method further includes storing the order number of the decoded VOP at a first available location of a display ordered read queue in the memory of the image processing device when the received VOP is not a P-VOP.07-09-2009
20090323807Enabling selective use of fractional and bidirectional video motion estimation - A video encoder may analyze whether or not to do bidirectional or fractional motion estimation dependent on the cost in terms of bits needed to do the motion estimation versus the benefit of the analysis in terms of distortion, in some embodiments.12-31-2009
20120099649METHOD AND APPARATUS FOR VARIABLE ACCURACY INTER-PICTURE TIMING SPECIFICATION FOR DIGITAL VIDEO ENCODING - A method and apparatus for variable accuracy inter-picture timing specification for digital video encoding is disclosed. Specifically, the present invention discloses a system that allows the relative timing of nearby video pictures to be encoded in a very efficient manner. In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The display time difference is then encoded into a digital representation of the video picture. In a preferred embodiment, the nearby video picture is the most recently transmitted stored picture. For coding efficiency, the display time difference may be encoded using a variable length coding system or arithmetic coding. In an alternate embodiment, the display time difference is encoded as a power of two to reduce the number of bits transmitted.04-26-2012
20110090962EFFECTIVE ERROR CONCEALMENT IN REAL-WORLD TRANSMISSION ENVIRONMENT - Presented herein are system(s), method(s), and apparatus for effective error concealment in real-world video transmission environments. In one embodiment, there is described a method for concealing errors in video data. The method comprises detecting whether a slice group in a picture contains errors; and replacing the slice group in the picture with a slice group of a most recent intra-coded picture if the slice group contains errors.04-21-2011
20110090961METHOD AND APPARATUS FOR ADAPTIVE QUANTIZATION IN DIGITAL VIDEO CODING - The invention relates to adjusting the quantization parameter in digital video coding. A shift value (QP Shift) is used to adjust the quantization parameter. The shift value is determined in a determining step 04-21-2011
20110317764INCLUSION OF SWITCHED INTERPOLATION FILTER COEFFICIENTS IN A COMPRESSED BIT-STREAM - In one example, an encoder may apply a plurality of pre-defined interpolation filters to units of video data, such as frames of reference video, in order to generate a plurality of different interpolated prediction data. The encoder may also at times determine that a new interpolation filter or set of interpolation filters might improve coding quality by either improving video compression or improving reconstructed image quality. The encoder may also signal to a video decoder whether one of the pre-defined interpolation filters was used or a new set of interpolation filters was used. The encoder may also signal to a video decoder whether to continue using the new set of interpolation filters, or whether to revert back to using the pre-defined set of interpolation filters. A video decoder can decode video data based on data received from the video encoder.12-29-2011
20090080523REMOTE USER INTERFACE UPDATES USING DIFFERENCE AND MOTION ENCODING - Frames of user interface graphical data can be remotely rendered at a client during a remote session with a server by providing graphical data commands to the client. The commands include motion commands derived from objects that change position between a current frame and a new frame and delta commands derived from differences between the frames. The delta commands can be generated from a frame update after applying motion commands or without applying motion commands. A server identifies moving objects having a first position in the current frame and a second position in the new frame, generates motion hints for the moving objects, and reduces the motion hints based on collision detection, motion verification and other factors. Motion commands are generated for the reduced set of motion hints and applied to a copy of the current frame at the server. Differences between the modified current frame and the new frame are then encoded as delta commands. The server then sends the motion commands and delta commands to the client. The client receives and applies the commands to the current frame to render the new frame.03-26-2009
20120002726Method and apparatus for scalable video coding - The present invention relates to method and apparatus for scalable video coding. In particular, the present invention describes a scalable video coding method and a layered video representation that achieves better video quality with more efficient bitstream representation and scalability, and yet is compliant with various codec standard from base layer to enhancement layers so that it incurs minimum modification to existing hardware or system deployed in the field.01-05-2012
20100118956METHOD AND DEVICE FOR EXTRACTING A MEAN LUMINANCE VARIANCE FROM A SEQUENCE OF VIDEO FRAMES - A method and a device for extracting a mean luminance value from a inter-coded frame is proposed, wherein the inter-coded frame is a part of a sequence of video frames, the method comprising: approximating DC coefficients for macro-blocks of the inter-coded frame based on DC coefficients of intra-coded macro-blocks surrounding reference blocks in a reference frame of the sequence, the reference blocks being pointed to by motion vectors of the macro-blocks of the inter-coded frame; and calculating the mean luminance value based on the approximated DC coefficients.05-13-2010
20120027090INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.02-02-2012
20120027088CODING MOTION PREDICTION DIRECTION IN VIDEO CODING - This disclosure relates to techniques for reducing a cost of coding prediction information in video coding. Video blocks in a generalized P/B (GPB) frame are encoded using up to two motion vectors calculated from reference pictures in two separate reference picture lists that are identical. When one of the reference picture lists is preferred over the other reference picture list, the preferred reference picture list may be used for unidirectional prediction, by default. When a GPB frame is enabled such that the first and second reference picture lists are identical, either of the first and second reference picture lists may be used for unidirectional prediction. The techniques include coding one or more syntax elements indicating that a video block is coded using one of the unidirectional prediction mode with respect to a reference picture in a reference picture list and the bidirectional prediction mode using less than two bits.02-02-2012
20120027089CODING MOTION VECTORS IN VIDEO CODING - This disclosure relates to techniques for reducing a cost of coding prediction information in video coding. Video blocks in a generalized P/B (GPB) frame are encoded using up to two motion vectors calculated from reference pictures in two separate reference picture lists that are identical. Video blocks of a GPB frame may, therefore, be encoded using a bidirectional prediction mode with a first motion vector from a reference picture in a first reference picture list and a second motion vector from the same or substantially similar reference picture in a second reference picture list. The techniques include jointly coding the first and second motion vectors for a video block of a GPB frame. The techniques include coding the first motion vector relative to a first motion predictor generated from a motion vector of a neighboring block, and coding the second motion vector relative to the first motion vector.02-02-2012
20120121017REFERENCE PICTURE LIST CONSTRUCTION FOR GENERALIZED P/B FRAMES IN VIDEO CODING - This disclosure relates to techniques for indicating that a video frame is coded as a generalized P/B (GPB) frame in order to reduce a cost of coding and constructing a second reference picture list in video coding. For a GPB frame, which has identical reference picture lists, signaling and constructing both the first and second reference picture lists may be redundant. The techniques of this disclosure may include coding syntax elements indicating that the video frame is coded as the GPB frame, and coding syntax elements indicating a number of reference pictures and reference picture list construction commands for only a first reference picture list. The techniques also include constructing the first reference picture list based on the syntax elements, and then creating the second reference picture list as a duplicate of the first reference picture list.05-17-2012
20100172414METHOD OF BLOCK PARTITION FOR H.264 INTER PREDICTION - Provided is a method for partitioning a block in inter prediction including selecting one standard reference frame from at least one reference frame which is a comparison target in inter prediction, searching whether or not a higher-level macroblock of a current frame is partitioned based on the selected standard reference frame, determining a partition size of the higher-level macroblock of the current frame, searching whether or not the higher-level macroblock in which the partition size is determined is partitioned by comparing with any certain reference frame other than the standard reference frame, and stopping a block size search on the higher-level macroblock of the current frame if a partition size of the higher-level macroblock of the current frame determined by comparing with the standard reference frame and a partition size of the higher-level macroblock of the current frame determined by comparing with the certain reference frame are different from each other.07-08-2010
20110103478INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.05-05-2011
20110103477INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.05-05-2011
20110103476INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.05-05-2011
20120163458METHOD FOR SELECTIVE SUB-LAYER MACROBLOCK DECODING - A method for selective sub-layer macroblock decoding includes sorting macroblocks into a plurality of layers, resolving a data dependency between the layers of the macroblocks, identifying the presence of decoding of each of the macroblocks in a sub-layer based on the data dependency, and selectively decoding the macroblocks based on the identified result.06-28-2012
20090067498Method of deriving a motion vector of a bi-predictive block based on a motion vector of a co-located block in a reference picture - In one embodiment, the method includes selecting the list 03-12-2009
20090060040Method and Apparatus for Decoding/Encoding a Video Signal - A method of decoding a current layer using inter-layer prediction is disclosed. The present invention includes obtaining a first flag information indicating whether a current block of the current layer is coded using the inter-layer prediction, obtaining a quality identification information identifying a quality of the current block, obtaining an information for controlling a characteristic of a deblocking filter based on the first flag information and the quality identification information, and executing deblocking filtering using the information for controlling the characteristic of the deblocking filter.03-05-2009
20100008420METHOD AND DECODER FOR REALIZING RANDOM ACCESS IN COMPRESSED CODE STREAM USING MULTI-REFERENCE IMAGES - The present invention discloses a method for realizing random access in a compressed code stream using multi-reference images and a decoder. The method includes: receiving a bit stream carrying prediction reference characteristic indication information which is for respectively indicating prediction reference characteristics of forward prediction encoded image P frames and bidirectional prediction encoded image B frames, wherein the forward prediction encoded image P frames and bidirectional prediction encoded image B frames are after an intra-frame encoded image I frame; and parsing the prediction reference characteristic indication information during random access, and decoding image frames in the bit stream according to an instruction of the prediction reference characteristic indication information. The present invention also discloses a decoder including a code stream processing module and a video decoding module. The present invention has high flexibility, and may achieve compromise between encoding efficiency and random access performance according to actual requirements.01-14-2010
20100008419Hierarchical Bi-Directional P Frames - Embodiments of the present invention provide systems, methods and apparatuses for generating forward, backward or bi-directional P frames. Prior to encoding a sequence of video frames, P frames within the video sequence can be reordered to include causal and/or non-causal references to one or more reference frames. This allows any block partition of a bi-directional P frame to include a single reference to a reference frame that is temporally displayed either before or after the bi-directional P frame. Compression and visual quality can therefore be improved. Hierarchical frame structures can be constructed using bi-directional P frames to better accommodate low complexity decoding profiles. Multilayered encoded video bitstreams can be generated based on the hierarchical frame structures and can include a first layer of anchor frames and one or more second layers that include bi-directional P frames that reference the anchor frames and/or any frame in any lower level layer.01-14-2010
20120314769VIDEO ENCODING/DECODING METHOD AND APPARATUS IN TEMPORAL DIRECT MODE IN HIERARCHICAL STRUCTURE - A video encoding/decoding method and apparatus in a temporal direct mode in a hierarchical structure. The video encoding method in the temporal direct mode in the hierarchical structure includes calculating a temporal position of a forward reference frame or a backward reference frame of a high-pass frame; searching for frames that exist at the temporal position and have motion vector information; if there is a plurality of frames searched for, selecting as a co-located frame a frame, among the plurality of frames, having a motion vector of which an interval is closest to a difference in interval between the forward reference frame and the backward reference frame of the high-pass frame, and extracting the motion vector of the selected frame; and encoding information on the selected frame so that the high-pass frame can use the extracted motion vector.12-13-2012
20120189057Motion Prediction in Video Coding - There is disclosed apparatuses, methods and computer programs for utilizing motion prediction in video coding. Coding type of a block of pixels of a video representation encoded in a bitstream is read, where values of said pixels having a first precision. If the type of the block is a block predicted by using two or more reference blocks, a first reference pixel location in a first reference block is determined and a second reference pixel location in a second reference block is determined. The first reference pixel location is used to obtain a first prediction having a second precision, which is higher than the first precision. The second reference pixel location is used to obtain a second prediction, also having the second precision. The first prediction and the second prediction are combined to obtain a combined prediction having the first precision.07-26-2012
20120230409DECODED PICTURE BUFFER MANAGEMENT - The example techniques described in this disclosure are generally related to decoded picture buffer management. One or more pictures stored in the decoded picture buffer may be usable for prediction, and others may not. Pictures that are usable for prediction may be referred to as reference pictures. The example techniques described herein may determine whether a reference picture, that is currently indicated to be usable for inter-prediction, should be indicated to be unusable for inter-prediction.09-13-2012
20110122949Image transmission method, image receiving method, image transmission device, image receiving device, and image transmission system - An image transmission method includes a step of inputting a plurality of different source moving images sequentially. The image transmission method also includes a step of creating a main image for each frame from one of the plurality of different source images. The image transmission method also includes a step of creating a secondary image for each frame from a differential image that expresses the difference between the source moving image from which the main image was created and another source moving image in a different frame. The image transmission method also includes a step of creating an integrated image by combining the main image and the secondary image. The image transmission method also includes a step of transmitting the integrated image to a receiving side.05-26-2011
20110002387Techniques for motion estimation - Techniques are described that can be used to apply motion estimation (ME) based on reconstructed reference pictures in a B frame or in a P frame at a video decoder. For a P frame, projective ME may be performed to obtain a motion vector (MV) for a current input block. In a B frame, both projective ME and mirror ME may be performed to obtain an MV for the current input block. A metric an be used determining a metric for each pair of MV01-06-2011
20110002386VIDEO ENCODER AND METHOD FOR PERFORMING INTRA-PREDICTION AND VIDEO DATA COMPRESSION - The invention provides a method for performing intra-prediction. A target pixel is selected from a plurality of pixels of a current block. A first intra-prediction mode of a left block, a second intra-prediction mode of an up block, and a third intra-prediction mode of the current block are then determined. A first prediction value of the target pixel is calculated according to the first intra-prediction mode. A second prediction value of the target pixel is calculated according to the second intra-prediction mode. A third prediction value of the target pixel is calculated according to the third intra-prediction mode. The first prediction value, the second prediction value, and the third prediction value are then averaged to obtain a weighted-average prediction value as an intra-prediction value of the target pixel.01-06-2011
20110249741Methods and Systems for Intra Prediction - Aspects of the present invention relate to systems and methods for intra prediction. According to a first aspect of the present invention, a pixel value, in a first block of a macroblock, may be predicted according to a first-direction intra-prediction mode when a flag has a first value and may be predicted according to a second-direction intra-prediction mode when the flag has a second value, wherein the first-direction intra-prediction mode and the second-direction intra-prediction mode are associated with opposite prediction directions.10-13-2011
20130142261SCALABLE MOTION ESTIMATION WITH MACROBLOCK PARTITIONS OF DIFFERENT SHAPES AND SIZES - Scalable motion estimation is provided for macroblocks of a picture with the macroblocks being subdividable into partitions of different shapes and sizes. One embodiment of a method for performing motion estimation includes setting a target complexity for a macroblock of a source frame and performing motion estimation for one or more partitions of the macroblock until the target complexity is met. The macroblock partitions can be rectangular, square or a combination of rectangular and square.06-06-2013
20110274172IMAGE INFORMATION DECODING APPARATUS AND IMAGE INFORMATION DECODING METHOD FOR MOTION PREDICTION AND/OR COMPENSATION OF IMAGES - The present invention is directed to an image information encoding apparatus, used in receiving compressed image information through network media when processing of such compressed image information is performed on storage media. A picture sorting buffer delivers information of picture type of frame Picture_type to a picture type discrimination unit. The picture type discrimination unit transmits command to a motion prediction/compensation unit on the basis of that information. The motion prediction/compensation unit generates predictive picture by using filter coefficients having the number of taps lesser than that of P picture with respect to B picture for which operation quantity and the number of memory accesses are required to more degree as compared to P picture on the basis of that command.11-10-2011
20120250767METHOD AND APPARATUS FOR BI-DIRECTIONAL PREDICTION WITHIN P-SLICES - Method and apparatuses are provided to enable bi-directional prediction (or bi-prediction) within P slices. A bi-predicted P slice is introduced herein as a new slice type in addition to existing I, P and B slices. A benefit of the new bi-predicted P slice is that it enables a video encoder to support temporal scalability without the need to use B pictures. Bi-predicted P slices enable the definition of a hierarchical GOP structure, which is a common method to allow temporal scalability in a video encoder. Another advantage of bi-predicted P slices is that it can improve coding efficiency over uni-directional P slices for some particular video content frames.10-04-2012
20130121417CONSTRAINED REFERENCE PICTURE SETS IN WAVE FRONT PARALLEL PROCESSING OF VIDEO DATA - A video encoder determines reference blocks for each inter-predicted prediction unit (PU) of a tree block group such that each of the reference blocks is in a reference picture that is in a reference picture subset for the tree block group. The reference picture subset for the tree block group includes less than all reference pictures in a reference picture set of the current picture. The tree block group comprises a plurality of concurrently-coded tree blocks in the current picture. For each inter-predicted PU of the tree block group, the video encoder indicates, in a bitstream that includes a coded representation of video data, a reference picture that includes the reference block for the inter-predicted PU. A video decoder receives the bitstream, determines the reference pictures of the inter-predicted PUs of the tree block group, and generates decoded video blocks using the reference blocks of the inter-predicted PUs.05-16-2013
20130121418MOVING IMAGE CODING APPARATUS - An image coding apparatus determines an image pattern of image data and, based on the determined image pattern, selects a prediction mode for generating predicted pixel values by predicting pixel values in a frame using pixel values in the same frame. Alternatively, based on photographing information concerning input image data, an image coding apparatus selects a prediction mode for generating predicted pixel values by predicting pixel values in a frame using pixel values in the same frame.05-16-2013
20130128974ADAPTIVE OVERLAPPED BLOCK MOTION COMPENSATION - In general, techniques are described for performing adaptive overlapped block motion compensation when coding video data. A video coding device configured to code video data may implement the techniques. The video coding device may comprise one or more processors configured to determine an adaptation metric from a region of support for one of a first partition and a second partition of one or more blocks of the video data separated by a partition boundary. The region of support may not be the entire one or more blocks of video data. The one or more processors may further be configured to adapt, based on the adaptation metric, application of an overlapped block motion compensation process to determine predicted pixel values near the partition boundary for a first predicted block representative of the first partition of the video block.05-23-2013
20080198930Image information transmission system, image information transmitting apparatus, image information receiving apparatus, image information transmission method, image information transmitting method, and image information receiving method - An image information transmission system may include an image information transmitting apparatus, and an image information receiving apparatus. The image information transmitting apparatus may obtain primary-image transmission data, which is subjected to predetermined compression-coding including bidirectionally predictive coding, for transmitting a moving image representing a primary image, and may generate secondary-image transmission data for transmitting a secondary image to be displayed together with the primary image on a display screen. The primary-image transmission data and the secondary-image transmission data may be transmitted to the image information receiving apparatus via a predetermined network communication link. Upon receipt of the primary-image transmission data and secondary-image transmission data, the image information receiving apparatus may decode the primary-image transmission data using a decoding scheme corresponding to the coding process, and may decode the secondary-image transmission data to generate a secondary-image video signal. The primary-image video signal and the secondary-image video signal may be combined to display an image.08-21-2008
20130148730METHOD AND APPARATUS FOR PROCESSING OCCLUSIONS IN MOTION ESTIMATION - A method and an apparatus for processing occlusions in motion estimation are described. For processing an occlusion in a forward motion field of a second frame relative to a first frame the forward motion field of the second frame relative to the first frame is determined with a motion estimator. Then an area in the second frame that is occluded in the first frame is identified with an occlusion identifier. Finally, a motion corrector determines a corrected forward motion field by filling the forward motion field in the identified area in the second frame using motion vectors of a previous backward motion field of the second frame relative to a previous third frame.06-13-2013
20130156104VIDEO PROCESSING APPARATUS AND METHOD - A video processing method includes decoding a bitstream that includes a plurality of groups of pictures and each group of pictures comprises a frame sequence, determining whether a current frame of a current group of pictures to be displayed has macroblocks with forward reference to a previous frame of a previous group of pictures, wherein the current group of pictures is subsequent to the previous group of pictures, and displaying the current frame of the current group of pictures when the current frame has no macroblock with forward reference to the previous frame of the previous group of pictures. The previous frame of the previous group of pictures is determined to be referenced by the current frame of the current group of pictures according to information specified from the encoding of the current frame.06-20-2013
20130188713BI-PREDICTION CODING METHOD AND APPARATUS, BI-PREDICTION DECODING METHOD AND APPARATUS, AND RECORDING MEDIUM - The present invention relates to a method and an apparatus of bi-prediction coding, a method and an apparatus of bi-prediction decoding and a recording medium. In accordance with the present invention, there is provided a method and an apparatus of bi-prediction coding, a method and an apparatus of bi-prediction decoding and a recording medium capable of solving a problem of complexity in implementing the bi-prediction coding of image compression and improving the coding efficiency by more efficiently transmitting a motion vector based on a fact that the movement is linearly generated.07-25-2013
20130188712Compressed Domain Watermarking with Reduced Error Propagation - Error drift during compressed domain watermarking can be reduced by embedding watermarking symbols in macroblocks that have relatively low influence on pixel values of other macroblocks during video decompression. This influence may be quantified using compression influence values (CIVs), which may be computed/assigned based on prediction dependency relationships amongst the various macroblocks in a sequence of frames. To wit, high CIVs are assigned to macroblocks that heavily influence the pixel values of other macroblocks during intra-frame/inter-frame prediction, while low CIVs are assigned to macroblocks that have little influence over the pixel values of other macroblocks. Macroblocks having the lowest CIVs may be selected for embedding compressed domain watermarking bits/symbols. Alternatively, macroblocks having high CIVs may be excluded from a pool of candidate macroblocks that are eligible for carrying embedded compressed domain watermarking bits/symbols.07-25-2013
20120044995INTERPOLATION OF VIDEO COMPRESSION FRAMES - Coding techniques for a video image compression system involve improving an image quality of a sequence of two or more bi-directionally predicted intermediate frames, where each of the frames includes multiple pixels. One method involves determining a brightness value of at least one pixel of each bi-directionally predicted intermediate frame in the sequence as an equal average of brightness values of pixels in non-bidirectionally predicted frames bracketing the sequence of bi-directionally predicted intermediate frames. The brightness values of the pixels in at least one of the non-bidirectionally predicted frames is converted from a non-linear representation.02-23-2012
20130202037RESTRICTION OF PREDICTION UNITS IN B SLICES TO UNI-DIRECTIONAL INTER PREDICTION - A computing device determines whether a prediction unit (PU) in a B slice is restricted to uni-directional inter prediction. In addition, the computing device generates a merge candidate list for the PU and determines a selected merge candidate in the merge candidate list. If the PU is restricted to uni-directional inter prediction, the computing device generates a predictive video block for the PU based on no more than one reference block associated with motion information specified by the selected merge candidate. If the PU is not restricted to uni-directional inter prediction, the computing device generates the predictive video block for the PU based on one or more reference blocks associated with the motion information specified by the selected merge candidate.08-08-2013
20130202038RESTRICTION OF PREDICTION UNITS IN B SLICES TO UNI-DIRECTIONAL INTER PREDICTION - A video coding device generates a motion vector (MV) candidate list for a prediction unit (PU) of a coding unit (CU) that is partitioned into four equally-sized PUs. The video coding device converts a bi-directional MV candidate in the MV candidate list into a uni-directional MV candidate. In addition, the video coding device determines a selected MV candidate in the merge candidate list and generates a predictive video block for the PU based at least in part on one or more reference blocks indicated by motion information specified by the selected MV candidate.08-08-2013
20130202039METHOD AND DEVICE FOR ENCODING/DECODING IMAGE USING EXTENDED SKIP MODE - A method and apparatus for encoding/decoding an image by using an extended skip mode are provided. The method includes setting a backward reference block motion vector with respect to an adjacent block of a current block as a predictive motion vector of the current block or determining a predictive motion vector from a forward reference block motion vector with respect to a block located in a backward reference picture at the same position as the current block, performing motion compensation by using the predictive motion vector, and setting a prediction mode when the motion compensation results in satisfaction of an optimal skip condition.08-08-2013
20120093224METHOD AND APPARATUS FOR VARIABLE ACCURACY INTER-PICTURE TIMING SPECIFICATION FOR DIGITAL VIDEO ENCODING - A method and apparatus for variable accuracy inter-picture timing specification for digital video encoding is disclosed. Specifically, the present invention discloses a system that allows the relative timing of nearby video pictures to be encoded in a very efficient manner. In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The display time difference is then encoded into a digital representation of the video picture. In a preferred embodiment, the nearby video picture is the most recently transmitted stored picture. For coding efficiency, the display time difference may be encoded using a variable length coding system or arithmetic coding. In an alternate embodiment, the display time difference is encoded as a power of two to reduce the number of bits transmitted.04-19-2012
20120093223METHOD AND APPARATUS FOR VARIABLE ACCURACY INTER-PICTURE TIMING SPECIFICATION FOR DIGITAL VIDEO ENCODING - A method and apparatus for variable accuracy inter-picture timing specification for digital video encoding is disclosed. Specifically, the present invention discloses a system that allows the relative timing of nearby video pictures to be encoded in a very efficient manner. In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The display time difference is then encoded into a digital representation of the video picture. In a preferred embodiment, the nearby video picture is the most recently transmitted stored picture. For coding efficiency, the display time difference may be encoded using a variable length coding system or arithmetic coding. In an alternate embodiment, the display time difference is encoded as a power of two to reduce the number of bits transmitted.04-19-2012

Patent applications in class Bidirectional