Abstract: At least a method and an apparatus are presented for efficiently encoding or decoding video. For example, the encoding or decoding comprises determining an intra prediction mode from a set of regular angular intra prediction modes and wide angular intra prediction modes wherein at least one of an angle or a reference array used by the angular intra prediction mode in the set are adapted to the width or the height of the image block which is not power of two. For example, the encoding or decoding comprises determining an intra sub-partition mode for an image block wherein at least one of a size or a number of intra sub-partitions in an intra sub-partition mode are adapted to the width or the height of the image block which is not power of two. Various embodiments are described for a ratio r used in an asymmetric split and p intra sub-partitions.

Abstract: In one implementation, KLT transform matrices are derived during the encoding or decoding process. In particular, the KLT transform matrices can be derived for either the primary transforming stage or the secondary transforming stage, or both. Because the KLT transform matrices can be derived at both the encoder and decoder sides, the KLT transform matrices do not need to be signaled in the bitstream. To derive the KLT transform matrix for a current block to be encoded or decoded, a template for the current block is defined, and is used to search in reconstructed regions multiple blocks with templates similar to the current template. Those multiple blocks are used to train the KLT transform matrix.

Abstract: A method for controlling a display of a frame representing a state of a game in a network-based gaining application comprising: sending (301A) an information representative of a user action to a server; receiving (305B) at least one frame representing a predicted state of the game predicted from the user action; obtaining an information allowing determining if said at least one frame corresponds to the user action; and; if the at least one frame corresponds to said user action, determining when displaying one of the at least one frame in function of a time at which this user action was performed and of said information.

Abstract: Apparatuses and methods are disclosed for encoding and decoding video data. Techniques are disclosed for encoding a video block, including dividing the video block into coding units and grouping the coding units into at least one group, the grouping comprises associating an indication with each of the coding units that indicates whether a shared coding information is to be used in the encoding of the respective coding unit. Techniques are also disclosed for decoding the video block, including obtaining from a bitstream the coding units and their respective indications. For a coding unit that is associated with an indication that the shared coding information is to be used, the decoding is performed based on the shared coding information; otherwise, the decoding is performed based on coding information parsed from the bitstream.

Abstract: Video encoding and decoding using non-rectangular partitioning. An example video decoding method includes: obtaining information identifying a non-rectangular first partitioning of a current block into a plurality of prediction units; determining a second partitioning of the current block into a plurality of transform units, wherein each transform unit is completely spatially contained within a respective one of the prediction units; and decoding the current block according to the non-rectangular first partitioning and the second partitioning. In some embodiments, the scan order of the transform units is determined such that all transform units contained in a same one of the prediction units are scanned before starting to scan transform units that are contained in a different one of the prediction units.

Abstract: Template matching prediction is combined with additional coding tools to provide a robust set of coding/decoding tools by advantageous use of syntax elements. Some of the additional coding tools comprise matrix intra prediction, intra sub-partitioning, low frequency non-separable transform, multiple transform selection.

Abstract: When dependent scalar quantization is used, the choice of the quantizer depends on the decoding of the preceding transform coefficient, and the entropy decoding of a transform coefficient depends on quantizer choice. To maintain high throughput in hardware implementations for transform coefficient entropy coding, several decision schemes of the scaler quantizer are proposed. In one implementation, the state transition and the context model selection are based on only regular coded bins. For example, the state transition can be based on the sum of the SIG, gt1 and gt2 flags, the exclusive-or function of the SIG, gt1 and gt2 flags, or based on only the gt1 or gt2 flag. When a block of transform coefficients is coded, the regular mode bins can be coded first in one or more scan passes, and the remaining bypass coded bins are grouped together in another one or more scan passes.

Abstract: A method for reducing a latency in a gaming application comprising: obtaining (305B) a first frame, said first frame being representative of a first action performed by a user in the gaming application; obtaining (500) information representative of a second action performed by the user in the gaming application, said second action following the first action; and, predicting (500) a second frame corresponding to the second action from data comprising at least the first frame and the information representative of a second action using a neural network.

Abstract: A method for video decoding is disclosed. A directional intra prediction mode is decoded for a block of a picture, the directional intra prediction mode having a direction. Based on the directional intra prediction mode, a first predictor and a second predictor for a sample in the current block are accessed, the first and second predictors being on a line at least approximating the direction. A sample value of the sample is predicted by interpolation using the first and second predictors, responsive to a difference between the second and first predictors, wherein the difference is scaled by at least a ratio that is based on a location of the sample in the block, and wherein a denominator of the ratio is a power of two regardless of the location of the sample. The sample of the block is reconstructed based on the predicted sample value.

Abstract: At least a method and an apparatus are presented for encoding or decoding video and can involve, for example, obtaining a group of coding units including two or more of a plurality of coding units divided from a current block wherein the two or more of the plurality of coding units share a coding parameter, and the group of coding units overlaps at least two different pipeline units associated with a pipelined decoding operation, and encoding or decoding the current block based on the group of coding units, and the shared coding parameter.

Abstract: The present principles relates to a method for intra-predictive encoding a coding unit comprising picture data, said intra-predictive encoding depending on a prediction tree and a transform tree, characterized in that the method further comprises: —obtaining said prediction tree by spatially partitioning the coding unit according to a non-square partition type; —determining said transform tree from said coding unit in order that each of its leaves is embedded into a unique unit of said obtained prediction tree; and —signaling in a signal the size of the leaves of said transform tree and said a non-square partition type.

Abstract: A cross-component dependent tool to be used for a chroma block of a picture is enabled responsive to a size of said chroma block and to a size of at least one luma block co-located with the chroma block. Then, the chroma block is decoded responsive to said enablement of said cross-component dependent tool. A encoding and decoding methods are presented as well as encoding and decoding devices.

Abstract: A Local illumination compensation system for video encoding and decoding uses memory for storing illumination compensation parameters and does not require access to reconstructed pixels of neighboring blocks. A set of illumination compensation parameters is stored in a dedicated buffer, which is of limited size, and which is decoupled from the coding unit level storage of information. The buffer contains a set of illumination compensation parameters, which may be, for example, computed (or determined in some other manner) on the fly or determined beforehand (for example for example obtained from the video signal or from a device).

Abstract: A method for video decoding is disclosed. A directional intra prediction mode is decoded for a block of a picture, the directional intra prediction mode having a direction. Based on the directional intra prediction mode, a first predictor and a second predictor for a sample in the current block are accessed, the first and second predictors being on a line at least approximating the direction. A sample value of the sample is predicted by interpolation using the first and second predictors, responsive to a difference between the second and first predictors, wherein the difference is scaled by at least a ratio that is based on a location of the sample in the block, and wherein a denominator of the ratio is a power of two regardless of the location of the sample. The sample of the block is reconstructed based on the predicted sample value.

Abstract: At least a method and an apparatus are presented for efficiently encoding or decoding video. For example, an intra prediction of an image block using at least one neural network from a context comprising pixels surrounding the image block is determined and an information relative to a transform method to apply for decoding the image block is also determined. The transform method is adapted to the neural network intra prediction mode of the block to encode or decode. The information relative to the transform method is inferred from the at least one neural network used in intra prediction of the image block at the encoding and either signaled or also inferred at the decoding.

Abstract: Apparatus and methods for encoding and decoding video data having improved quantization parameter prediction are presented and can include using a combination of quantization parameter prediction values obtained from respective ones of a plurality of quantization parameter prediction methods to encode or decode the video data.

Abstract: Different implementations are described, particularly implementations for video encoding and decoding are presented. Accordingly, the encoding or decoding comprises obtaining a merging candidate index that enables deriving both a first merging candidate index and a second merging candidate index in a triangular shape based motion compensation candidates list in list in use in triangular shape based motion compensation. According to a particular characteristic, a mapping function determines the derivation process of both indices among a subset of possible combinations of merge candidate indices.

Abstract: Different implementations are described, particularly implementations for video encoding and decoding are presented. Accordingly, the encoding or decoding comprises obtaining parameters of a decoded picture buffer used in decoding an encoded picture. The signaling of parameters relative to the decoded picture buffer is controlled by a syntax data element sps_sublayer_dpb_params_flag related to the control of the presence of syntax elements in a decoded picture buffer parameters syntax structure in a SPS. According to a particular characteristic, the syntax data element sps_sublayer_dpb_params_flag is inferred to zero when the syntax data element sps_ptl_dpb_hrd_params_present_flag specifies that decoded picture buffer parameters syntax structure is not present in the SPS.

Abstract: Different implementations are described, particularly implementations for video encoding and decoding are presented. Accordingly, the encoding or decoding comprises obtaining a residual coding mode of a block of a picture, wherein the residual coding mode is one of regular residual coding mode (RRC) or transform skip residual coding mode (TSRC); decoding the block of the picture according to the obtained residual coding mode. According to a particular characteristic, the residual coding mode is set to regular residual coding mode (RRC) when transform skip is disabled. According to another particular characteristic, the residual coding mode is decoded from a syntax element when transform skip is enabled.

Abstract: A video coding system is provided that performs intra prediction in a mode using a neural network for block of only a set of specific block sizes. The signaling of this mode is designed to be efficient in terms of rate-distortion under this constraint. Different transformations of the context of a block and the neural network prediction of this block are introduced in order to use one single neural network for predicting blocks of several sizes, as well as the corresponding signaling. The neural network-based prediction mode considers both luminance blocks and chrominance blocks. The video coding system comprises encoder and decoder apparatuses, encoding, decoding and signal generation methods and a signal carrying information corresponding to the described coding mode.