Patent application number | Description | Published |
20120327999 | Encoding mode values representing prediction modes - A method of encoding a mode value representing a prediction mode comprises selecting from among at least first and second encoding processes an encoding process to apply to the mode value to be encoded. The first encoding process comprises encoding first information indicating a predetermined relationship between the mode value to be encoded and at least one predetermined value. The second encoding process comprises encoding second information representing the mode value to be encoded. The encoding by the second encoding process takes account of the outcome of at least one prior first encoding process. This can be achieved by updating mode probabilities based on the outcome of the first, as well as the second, encoding process. Such a method creates a link between the first and second encoding processes and can improve coding efficiency. | 12-27-2012 |
20130272420 | VIDEO ENCODING AND DECODING WITH IMPROVED ERROR RESILIENCE - A sequence of digital images is encoded into a plurality of encoding units. An image portion is encoded by motion compensation with respect to a reference image portion indicated by an item of motion information. A motion information predictor is determined among a set of motion information predictors and the item of motion information is encoded with respect to the motion information predictor. It is determined to encode the motion information predictors of an encoding unit using either a first encoding mode, which provides encoded data efficiently compressed but not parseable by a decoder in case of losses in the bitstream, or a second encoding mode which provides encoded data less efficiently compressed but systematically parseable by a decoder even in case of losses in the bitstream. | 10-17-2013 |
20130279596 | VIDEO ENCODING AND DECODING WITH IMPROVED ERROR RESILIENCE - A method of encoding a sequence of digital images into a bitstream comprises generating for an image portion to encode a set of motion information predictors having controlled diversity and selecting a motion information predictor for the image portion to encode from the generated set of motion information predictors. Generating the set comprises: generating first motion information predictors; identifying one or more first motion information predictors as seed predictors; generating one or more second motion information predictors based on the seed predictor(s); and forming said set of motion information predictors from the first and/or second motion information predictors. | 10-24-2013 |
20130287112 | VIDEO ENCODING AND DECODING WITH IMPROVED ERROR RESILIENCE - An encoding method comprises obtaining a target number of motion information predictors to be used for an image portion to encode and generating a set of motion information predictors using the obtained target number. The set is generated by: obtaining a first set of motion information predictors each associated with an image portion having a predetermined spatial and/or temporal relationship with the image portion being encoded; modifying the first set of motion information predictors by removing duplicate motion information predictors to obtain a reduced set of motion information predictors containing a first number of motion information predictors, each motion information predictor of the reduced set being different from any other motion information predictor of the reduced set; comparing the first number of motion information predictors to the target number obtained, and if the first number is lower than the target number, obtaining an additional motion information predictor and adding it to the reduced set of motion information predictors. | 10-31-2013 |
20130287113 | VIDEO ENCODING AND DECODING WITH IMPROVED ERROR RESILIENCE - A sequence of digital images is encoded into a bitstream, at least one portion of an image being encoded by motion compensation with respect to a reference image portion. A target number of motion information predictors is obtained. Using the target number a set of motion information predictors is generated having controlled diversity. A motion information predictor for the image portion to encode is selected from the generated set of motion information predictors. The target number is signaled in the bitstream, together with information relating to the selected motion information predictor. | 10-31-2013 |
20130294521 | VIDEO ENCODING AND DECODING WITH IMPROVED ERROR RESILIENCE - For an image portion to encode an initial set of motion information predictors is obtained. It is tested whether the number of motion information predictors in the initial set is lower than a target number and, if so, one or more motion information predictors are added to the initial set to generate a set of motion information predictors having controlled diversity. The motion information predictors of the initial set are actual motion information predictors, having motion vectors obtained from image portions of the image being encoded or of a reference image, and potential motion information predictors for addition include one or more further such actual motion information predictors and also include one or more virtual motion information predictors not having motion vectors obtained from image portions of said image being encoded or of a reference image. A motion information predictor for the image portion to encode is selected from the generated set of motion information predictors. | 11-07-2013 |
20130301734 | VIDEO ENCODING AND DECODING WITH LOW COMPLEXITY - A target number of motion information predictors to be used for an image portion to encode is obtained. A first set of motion information predictors is obtained each associated with an image portion having a predetermined spatial and/or temporal relationship with the image portion being encoded. Duplicates are eliminated to obtain a reduced set of motion information predictors containing a first number of motion information predictors, each motion information predictor of said reduced set being different from any other motion information predictor of said reduced set. The first number is compared to the target number and, if said first number is lower than said target number, an additional motion information predictor is obtained and added to the reduced set of motion information predictors. | 11-14-2013 |
20140016874 | METHOD AND DEVICE FOR PREDICTING AN IMAGE PORTION FOR ENCODING OR DECODING OF AN IMAGE - A method of predicting a portion of an image, for encoding or decoding of an image, the image portion being predicted by an intra prediction process with respect to samples of at least one reference image portion of the image, the method comprising deriving samples from at least one reference image portion; generating, from said derived samples, by the intra prediction process, at least one prediction image portion corresponding to the image portion to be predicted; and applying a parametric displacement transformation to at least the derived samples and/or the prediction image portion. A method and device for encoding and a method an device for decoding are also described. | 01-16-2014 |
20140064369 | VIDEO ENCODING AND DECODING - Motion vectors of a first reference frame are permitted to point to a plurality of further reference frames. A method of storing the motion vectors comprises, when a block of the first reference frame has two motion vectors initially, selecting one of the two motion vectors, the non-selected motion vector not being stored. The selected motion vector may be scaled. This can reduce the motion vector memory size. | 03-06-2014 |
20140064372 | VIDEO ENCODING AND DECODING - A temporal motion vector predictor is includable, together with one or more spatial motion vector predictors, in a set of motion vector predictors for a block to encode of a current frame. A method of determining the temporal motion vector predictor comprises selecting as the temporal predictor one motion vector from among motion vectors in a reference block of a reference frame different from the current frame. The reference block is a block of the reference frame collocated with the block to encode or a block of the reference frame neighboring the collocated block. The selection is based on a diversity criterion for achieving diversity among the predictors of the set. | 03-06-2014 |
20140177721 | METHOD AND DEVICE FOR DETERMINING RESIDUAL DATA FOR ENCODING OR DECODING AT LEAST PART OF AN IMAGE - A method and device for determining residual data for encoding at least part of an image of an enhancement layer of video data, the video data including the enhancement layer and a base layer, the enhancement layer being composed of processing blocks and the base layer being composed of elementary units each having associated residual data, the method comprising for a processing block of the enhancement layer
| 06-26-2014 |
20140192860 | METHOD, DEVICE, COMPUTER PROGRAM, AND INFORMATION STORAGE MEANS FOR ENCODING OR DECODING A SCALABLE VIDEO SEQUENCE - The invention relates to a method of encoding or decoding a scalable video sequence of frames encoded in a bit-stream made of at least one lower layer and one upper layer, the method comprising:
| 07-10-2014 |
20140192869 | Method, device, computer program, and information storage means for encoding or decoding a video sequence - The invention relates to video coding. A method of encoding or decoding such a video sequence according to the invention comprises: obtaining a reconstructed frame area made of an array of sample values; applying a sample adaptive offset, SAO, filtering to the reconstructed frame area based on SAO parameters; wherein at least one of the SAO parameters is determined independently of the sample values of the reconstructed frame area. Preferably, the sample-independent SAO parameters define an Edge Offset filtering. | 07-10-2014 |
20140192884 | Method and device for processing prediction information for encoding or decoding at least part of an image - A method of processing prediction information for encoding or decoding at least part of an image of an enhancement layer of video data, the video data including the enhancement layer and a base layer, the enhancement layer being composed of processing blocks and the base layer being composed of elementary units each having associated prediction data, the method comprising for a processing block of the enhancement layer: obtaining prediction data of at least a co-located elementary unit of the reference data, the prediction data defining first predictors; and generating, from said prediction data obtained, further predictors for prediction of the current processing block. | 07-10-2014 |
20140192886 | Method and Apparatus for Encoding an Image Into a Video Bitstream and Decoding Corresponding Video Bitstream Using Enhanced Inter Layer Residual Prediction - A method for encoding an image of pixels and for decoding a corresponding bit stream is described. More particularly, it concerns residual prediction according to a spatial scalable encoding scheme. It can be considered in the context of the Scalable extension of the HEVC standard (noted SHVC), being developed by the ISO-MPEG and ITU-T standardization organizations. It is proposed to simplify the computational complexity and the memory usage needed by the GRILP and DIFF inter modes by combining upsampling and motion compensation operations into one single operation and/or reducing the complexity of the linear filtering processes involved in some of the processes and/or adopt some limiting usage of these two modes when combined with bidirectional prediction. Accordingly a reduction of the complexity is achieved with, at worst, a limited loss in coding efficiency. | 07-10-2014 |
20140301487 | METHOD AND DEVICE FOR CLASSIFYING SAMPLES OF AN IMAGE - A method and a device for classifying samples of an image, each sample having a respective sample value the method comprising repartition of each of the samples into a plurality of index classes, wherein the index class allocated to each sample is determined in dependence upon the sample value of the said sample with respect to the sample values of first neighbouring samples of said sample according to a given direction and further in respect to the sample values of the first neighbouring samples with respect to the sample values of samples neighbouring the first neighbouring samples according to the said given direction. Processing each sample according to the respective allocated index class. | 10-09-2014 |
20140321544 | Method and Device for Encoding a Sequence of Images and Method and Device for Decoding a Sequence of Images - A method and device for deriving at least one motion information predictor for encoding of an image portion by motion compensation. At least two distinct first and second subsets of motion information predictors of a first set of motion information predictors are provided. Processing of the first subset of motion information predictors and processing of the second subset of motion information predictors is performed to obtain a final set of motion information predictors usable for predicting said image portion from the reference image portion. Processing of the second subset may comprise removing duplicates from among the motion information predictors of said second subset, and may be performed so as to exclude temporal predictors. At least part of the processing of the second subset of motion information predictors may be performed concurrently with at least part of the processing of the first subset of motion information predictors. | 10-30-2014 |