Patent application number | Description | Published |
20090097555 | Video encoding method and device - Successive images (F) of a video sequence are encoded in order in generate parameters which are included in an output flow (F) that is to be transmitted to a decoder. The encoding of certain images is effected in Inter mode relative to one or several previous images of the sequence. The output flow also includes long term marking commands for certain images and demarking commands for previously marked images. Each long-term marked image is kept in a memory by the decoder until a corresponding demarking command is received. Return information on the restoration of the images of the video sequence by the decoder is received by the encoder (1) and analyzed in order to identify an image that has been lost by the decoder. It is possible to encode a following image of the sequence in Inter mode in relation to a long-term marked image in response to identification of an image lost to the decoder. | 04-16-2009 |
20090129464 | Adaptive Coding and Decoding - The invention relates to a method of transmitting an image portion, which method comprises, in a coding phase analyzing a coding context, adapting a parameter of a group of prediction functions that can be used for coding, forming a first predicted descriptor using a selected prediction function, and determining and transmitting a residue between the first predicted descriptor and the current descriptor. The method further includes a decoding phase comprising analyzing a decoding context, adapting a parameter of a group of prediction functions that can be used for decoding, forming a second predicted descriptor using a selected prediction function and combining the second predicted descriptor and the received residue to deliver a decoded version of the current descriptor. | 05-21-2009 |
20090138933 | Use of a Feedback Channel for Image Broadcasting - The invention relates to a method for broadcasting images from a video sequence, the method comprising the following steps at the level of a broadcasting equipment ( | 05-28-2009 |
20090213939 | Video Coding Method And Device - A video coding method, comprising the following steps: a) successive images (F) of a video sequence are coded to generate coding parameters, b) the coding parameters are included in an output stream (Φ) to be transmitted to a station (B) including a decoder ( | 08-27-2009 |
20100195740 | DECODING FUNCTION SELECTION DISTRIBUTED TO THE DECODER - The present invention relates to a method of transmitting at least one current image portion, wherein the method comprises selecting a coding function from a finite set of coding functions by applying at least one choice function of a first type, said choice function or functions of said first type using already-decoded image data, coding the current image portion using the selected coding function, sending the coded image portion to a decoder, and sending to said decoder information describing the choice function or functions of said first type. The invention also relates to the corresponding decoding method. | 08-05-2010 |
20100266046 | MOTION ENCODING AND DECODING - A method is provided for encoding a portion of a current image, including: an estimation of motion between the current image portion and a plurality of candidate image portions in order to form motion components, an evaluation of a performance criterion for each candidate image portion, and the selection of a reference image portion using said performance criteria. In the method, for at least one motion component, the motion estimation, the performance criteria evaluation and the reference image portion selection only use information considered to be available at the decoder and no motion information is inserted into an output flow intended for a decoder. A corresponding decoding method is also provided. | 10-21-2010 |
20110026594 | CODING AND DECODING OF AN IMAGE OR OF A SEQUENCE OF IMAGES SLICED INTO PARTITIONS OF PIXELS OF LINEAR FORM - A method is provided of coding an image or a sequence of images generating a stream of data comprising data representative of at least one group of pixels in one of said images. Such a method comprises the steps of: selecting, for a group of pixels to be coded, an initial partition of predetermined linear form, slicing said group of pixels to be coded according to said selected initial partition, propagating said initial partition selected in said group of pixels to be coded, until the latter is sliced in its entirety into a plurality of partitions of predetermined form, selecting, for said sliced group of pixels, a predetermined order of traversal of said partitions, predicting and coding said partitions one after the other, according to said selected order of traversal. | 02-03-2011 |
20110026845 | PREDICTION OF IMAGES BY PRIOR DETERMINATION OF A FAMILY OF REFERENCE PIXELS, CODING AND DECODING USING SUCH A PREDICTION - A method is provided for predicting partitions of at least one group of pixels in an image to be coded, with respect to a group of reference pixels. Accordingly, the group of reference pixels is obtained by calculating a function characteristic of a predetermined mode of prediction, the reference pixels of the group obtained being variable from one partition to another. | 02-03-2011 |
20120121021 | PREDICTION OF A MOVEMENT VECTOR OF A CURRENT IMAGE PARTITION POINTING TO A REFERENCE ZONE THAT COVERS SEVERAL REFERENCE IMAGE PARTITIONS AND ENCODING AND DECODING USING ONE SUCH PREDICTION - A method and apparatus are provided for predicting a movement vector of a current image partition in relation to a movement vector of a reference partition having the same form as the current image partition and belonging to a reference image (IN- | 05-17-2012 |
20130039425 | METHOD FOR PROCESSING A MOTION INFORMATION ITEM, ENCODING AND DECODING METHODS, CORRESPONDING DEVICES, SIGNAL AND COMPUTER PROGRAM - A method and apparatus are provided for processing movement information relating to a regular image of a sequence of images. The method includes: a step of building a list including at least one expected piece of movement information and at least one unexpected piece of movement information; a first step of associating expected movement information with movement information according to a first rule for optimizing the cost of encoding the movement information to be encoded; a second step of associating each unexpected piece of movement information not associated during the first association step with movement information to be encoded, identified among the pieces of movement information of the list, according to a second rule which aims to ensure that each piece of movement information is associated with a single piece of movement information to be encoded. | 02-14-2013 |
20130272400 | METHODS AND DEVICES FOR ENCODING AND DECODING AT LEAST ONE IMAGE IMPLEMENTING A SELECTION OF PIXELS TO BE PREDICTED, AND CORRESPONDING COMPUTER PROGRAM - A method is provided for decoding a signal that represents at least one image. The method implements at least one iteration of the following steps, for at least one block of the image to be decoded: determining at least one selection parameter from at least one characteristic associated with at least one reference pixel of a reference region of the image, the reference region including at least one previously encoded/decoded block and/or at least one pixel predicted in a preceding iteration; selecting at least one pixel to be predicted in the block to be decoded from the at least one selection parameter; and for at least one selected pixel to be predicted, referred to as an anchor pixel, predicting the anchor pixel from at least one reference pixel, thereby outputting a predicted pixel. | 10-17-2013 |
20140233655 | ESTIMATION OF MOTION AT THE LEVEL OF THE DECODER BY MATCHING OF MODELS - Methods and apparatus are provided for decoding and coding a data signal representing at least one current image split up into partitions. The method of decoding includes, for at least one current partition to be reconstructed in the image, steps of: prediction of the current partition from at least one already decoded causal partition, and reconstruction of the current partition, from the predicted current partition, delivering a reconstructed current partition. Following the aid reconstruction step, the decoding method implements steps of: determination of at least one already decoded causal partition using a motion estimation applied to the reconstructed current partition, and modification of the reconstructed current partition by calculation of a function applied both to the determined causal partition and to the reconstructed current partition, delivering a modified reconstructed current partition. | 08-21-2014 |
20140348237 | METHOD FOR ENCODING AND DECODING IMAGES, DEVICE FOR ENCODING AND DECODING IMAGES AND CORRESPONDING COMPUTER PROGRAMS - An encoding device and method are provided for encoding at least one image split into partitions. The method implements, for a current partition to be encoded, steps of: selecting at least one causal partition already encoded and then decoded; calculating at least one optimal encoding parameter associated with the selected causal partition, according to a predetermined criterion of encoding performance, by comparing a plurality of encoding parameters applied to the selected causal partition; and encoding the current partition by using the calculated optimum encoding parameter. | 11-27-2014 |
20150043635 | ENCODING AND DECODING BY SELECTIVE INHERITANCE - A method is provided for decoding at least one current encoded block of a first image relative to a reference block of a second image including at least one common element with the first image, wherein the reference block has been previously decoded. The method includes: filtering the decoded reference block; estimating, only on the basis of the filtered decoded reference block, at least one value of a local characteristic of the filtered decoded reference block; determining, on the basis of the estimated value of the local characteristic: a set of decoding information to be used for decoding the current block, a method for decoding the current block, on the basis of the estimated value of the local characteristic, decoding the current block on the basis of the set of determined decoding information and according to the determined decoding method. | 02-12-2015 |