| Patent application number | Description | Published |
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| 20080240237 | REAL-TIME FACE DETECTION - An apparatus, a method, and a computer-readable medium having instructions encoded thereon that when executed cause a method to be carried out. The method includes dividing at least a portion of a picture of a video stream into parts of blocks, and processing the parts in parallel by a plurality of interconnected processors. The processing of a respective part by its respective processor includes edge detection and color segmentation to determine block-level edge features including block-level color-segmented edge features. Each processor also performs coding functions on its respective part of the picture. The method also includes block-level processing using the block-level edge features to determine which blocks in the picture are likely to be that of a face, the block-level processing being at the granularity of at least a block. | 10-02-2008 |
| 20080240571 | REAL-TIME FACE DETECTION USING TEMPORAL DIFFERENCES - An apparatus, a method, and a computer-readable medium having instructions encoded thereon that when executed cause a method to be carried out. The method includes dividing at least a portion of a picture of a video stream into parts of blocks, and processing the parts in parallel by a plurality of interconnected processors. The processing of a respective part by its respective processor includes determining block-level temporal difference features. Each processor also performs coding functions on its respective part of the picture. The method also includes block-level processing using the block-level temporal difference features to determine which blocks in the picture are likely to be that of a face, the block-level processing being at the granularity of at least a block. In one version, the processing in each processor includes edge detection and color segmentation to determine block-level edge features including block-level color-segmented edge features that are then used in the block level processing. | 10-02-2008 |
| 20090016440 | POSITION CODING FOR CONTEXT-BASED ADAPTIVE VARIABLE LENGTH CODING - Particular embodiments include a method, an apparatus, and logic embodied in tangible computer-readable medium that when executed carries out a method of encoding an ordered sequence of quantized transform coefficients of a block of image data. One embodiment is a context adaptive variable length coding method that includes position coding the positions of zero-valued and non-zero valued coefficients by either a mixed method that encodes either the run length of zeroes preceding a non-zero coefficient or the run length of nonzero-valued coefficients preceding a zero-valued coefficients. Another includes position coding that uses a variable length code for two parameters respectively indicating the number of zero-valued coefficient positions and nonzero-valued coefficient positions still to be coded. | 01-15-2009 |
| 20090086815 | CONTEXT ADAPTIVE POSITION AND AMPLITUDE CODING OF COEFFICIENTS FOR VIDEO COMPRESSION - A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes encoding the position of non-zero-valued coefficients in an ordered series of quantized transform coefficients of a block of image data, including encoding events using variable length coding using a plurality of variable length code mappings that each maps events to codewords, the position encoding including switching between the code mappings based on the context. The coding method further includes encoding amplitudes of the non-zero-valued coefficients using variable dimensional amplitude coding in the reverse order of the original ordering of the series. | 04-02-2009 |
| 20090087109 | REDUCED CODE TABLE SIZE IN JOINT AMPLITUDE AND POSITION CODING OF COEFFICIENTS FOR VIDEO COMPRESSION - A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes jointly encoding joint events that each are defined by a cluster of consecutive non-zero-valued coefficients, each joint event defined by three parameters: the number of zero-valued coefficients preceding the cluster, the number of non-zero-valued coefficients in the cluster, and an indication of which trailing coefficients up to a maximum number of M trailing coefficients have amplitude greater than 1, with the coding using a 3-dimensional joint VLC table. The method further includes encoding the amplitude of the non-zero-valued trailing coefficients that have amplitude greater than 1 encoding the amplitude of any remaining non-zero-valued coefficients in the clusters that have more than M non-zero-valued coefficients. | 04-02-2009 |
| 20090087113 | VARIABLE LENGTH CODING OF COEFFICIENT CLUSTERS FOR IMAGE AND VIDEO COMPRESSION - A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes encoding cluster of consecutive non-zero-valued coefficients, the encoding of a cluster including jointly encoding joint events that each are defined by at least two parameters: the number of zero-valued coefficients preceding the cluster, and the number of non-zero-valued coefficients in the cluster. The encoding of the cluster also includes encoding a parameter indicative of the number of amplitude-1 trailing non-zero-valued coefficients in the cluster, in one version with the parameter indicative of the number of trailing amplitude-1 coefficients part of the joint events such that the coding is according to a 3-dimensional joint variable length coding table. The method further includes encoding the amplitudes of the non-zero-valued coefficients that are not encoded by the joint encoding, e.g., encoding the amplitudes of the other than the trailing amplitude-1 coefficients. | 04-02-2009 |
| 20090154820 | CONTEXT ADAPTIVE HYBRID VARIABLE LENGTH CODING - A coding method for an ordered series of quantized transform coefficients of a block of image data, including a context adaptive position coding process to encode the position of clusters of non-zero-valued coefficients, e.g., a multidimensional position coder that uses one of a plurality of code mappings selected according to at least one criterion including at least one context-based criterion, and an amplitude encoding process to encode any amplitudes remaining to be coded, the amplitude coding using one or a plurality of amplitude code mappings selected according to at least one criterion, including a context-based criterion. A context-based selection criterion is meant a criterion that during encoding is known or derivable from one or more previously encoded items of information. Also a coding apparatus, a decoding apparatus, a computer readable medium configured with instructions that when executed implement a coding method, and another medium for a decoding method. | 06-18-2009 |
| 20090238278 | VIDEO COMPRESSION USING SEARCH TECHNIQUES OF LONG-TERM REFERENCE MEMORY - Particular embodiments generally relate to video compression. In one embodiment, a store of reference frames is provided in memory. The reference frames may be classified based on a plurality of classifiers. The classifiers may correspond to features that are found in the reference frame. A frame to encode is then received. The frame is analyzed to determine features found in the frame. As macroblocks in the frame are encoded, a macroblock is analyzed to determine which feature may be included in the macroblock. The feature is used to determine a classifier, which is used to determine a subset of the reference frames. The subset is then searched to determine a reference frame for the macroblock. | 09-24-2009 |
| 20090256901 | Pop-Up PIP for People Not in Picture - A system and method for alerting participants in a videoconference that one or more participants are improperly framed by the videoconference camera is provided. An embodiment comprises a temporary self-view picture-in-picture image appearing when the number of faces detected by the videoconference camera changes. A face detection algorithm is used to determine when the number of faces being detected by the videoconference camera has changed. The self-view picture-in-picture image displays, for a duration of time, a representation of the image being captured by the videoconference camera, allowing participants who are not properly framed by the videoconference camera to adjust their position to that their faces are captured by the videoconference camera. | 10-15-2009 |
| 20090324023 | Combined Face Detection and Background Registration - Techniques are provided to analyze video frames of a video signal in order to distinguish regions containing a face (and body torso) from regions that contain a relatively static background. The region containing the face is referred to as a foreground region. A current video frame is divided into a plurality of elements and the foreground regions and background regions are detected. The background regions of a subsequent video frame are detected/registered using the foreground regions of the current video frame. The foreground regions of the subsequent video frame are determined using the background regions of the current video frame as a temporal reference. | 12-31-2009 |
| 20100061225 | NETWORK-ADAPTIVE PREEMPTIVE REPAIR IN REAL-TIME VIDEO - A network-adaptive error recovery method for real-time video transmission based on sending repair frames preemptively with a frequency that is based on observed run-length of good frames and round trip time. | 03-11-2010 |
| 20100119164 | Embedded Image Quality Stamps - In an image generation and rendering system, a quality stamp indicative of image fidelity is embedded in image data units resulting from image data compression/encoding. At decoding, the image quality stamp is captured and when the decoded image is rendered, a fidelity indicator is displayed along with the image. | 05-13-2010 |
| 20100125768 | ERROR RESILIENCE IN VIDEO COMMUNICATION BY RETRANSMISSION OF PACKETS OF DESIGNATED REFERENCE FRAMES - Techniques are provided for video communication between multiple devices. Each of a plurality of video packets is designated as being part of a required reference frame that is subsequently to be used for a repair process. A stream of video packets that includes the packets for the required reference frame is transmitted from a source device over a communication medium for reception by a plurality of destination devices. A determination is made that at least one of the plurality of destination devices did not receive at least one packet of the required reference frame, and the at least one packet is retransmitted the at least one of the plurality of destination devices. When the retransmitted packet is received at the at least one destination device, it is decoded and stored without using it for generating a picture for display at the time that the at least one packet is received. | 05-20-2010 |
| 20100202670 | CONTEXT AWARE, MULTIPLE TARGET IMAGE RECOGNITION - In one embodiment, an apparatus may receive at least one image in which multiple targets are represented. The apparatus may assign possible identities to the targets based on probabilities associated with the identities. The apparatus may base a probability of a target being one of the identities, at least in part, on an identity-specific context and on a conditional probability that the target is the identity given that each one of at least two other of the targets is another respective one of the identities. The identity-specific context may be information that relates to a determined identity. The apparatus may identify the targets based on the identities and on the probabilities associated with the identities. | 08-12-2010 |
| 20100208078 | HORIZONTAL GAZE ESTIMATION FOR VIDEO CONFERENCING - Techniques are provided to determine the horizontal gaze of a person from a video signal generated from viewing the person with at least one video camera. From the video signal, a head region of the person is detected and tracked. The dimensions and location of a sub-region within the head region is also detected and tracked from the video signal. An estimate of the horizontal gaze of the person is computed from a relative position of the sub-region within the head region. | 08-19-2010 |
| 20100246680 | REFERENCE PICTURE PREDICTION FOR VIDEO CODING - A video coder includes a forward coder and a reconstruction module determining a motion compensated predicted picture from one or more previously decoded pictures in a multi-picture store. The reconstruction module includes a reference picture predictor that uses only previously decoded pictures to determine one or more predicted reference pictures. The predicted reference picture(s) are used for motion compensated prediction. The reference picture predictor may include optical flow analysis that uses a current decoded picture and that may use one or more previously decoded pictures together with affine motion analysis and image warping to determine at least a portion of at least one of the reference pictures. | 09-30-2010 |
| 20110080946 | LOCALLY VARIABLE QUANTIZATION AND HYBRID VARIABLE LENGTH CODING FOR IMAGE AND VIDEO COMPRESSION - A coding method, apparatus, and storage media with instructions to carry out a method. The method operates on an ordered series of transform coefficients of a block of image data, and for a fixed quantization method, and includes quantizing and encoding the ordered series to form a coded bitstream. The quantizing and encoding uses one or more variable length code (VLC) mappings. The quantizing includes quantizing to have amplitude-1 at least one coefficient that would be quantized by the fixed quantization method to have zero amplitude, quantizing to have zero amplitude at least one coefficient that would be quantized by the fixed quantization method to have amplitude-1, and using the fixed quantization method to quantize any coefficient that is quantized by the fixed quantization method not to have zero amplitude, amplitude-1, or amplitude-2. | 04-07-2011 |
