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.

Abstract: In some chroma formats, monochrome processing is performed for each color component. For example, for 4:0:0, only luma components exist, and all chroma related syntax and code are not used. In addition, for 4:4:4 when separable color plane is activated, the chroma components are treated as independent luma components, and the codec may behave as if no chroma is present at all and no chroma related tools are used. To reduce redundancy in coding parameters related to chroma, in one implementation, a flag indicating the availability of chroma components is coded. In another implementation, inter-related syntax is omitted in an intra-only coding mode for video data. In addition, slice level control of LMCS is provided.

Abstract: Decoding and/or encoding video information included in a bitstream can involve a predicted quantization matrix associated with at least a portion of the video information and a syntax element indicating that at least one coefficient of the predicted quantization matrix is to be interpreted as a residual such that the decoding and/or encoding of at least a portion of the video information is based on a combination of the predicted quantization matrix and the residual, where the syntax element is obtained from the bitstream during decoding, or included in the bitstream during encoding.

Abstract: In general, encoding or decoding a picture part can involve determining a spatiotemporal motion vector predictor (STMVP) candidate for a merge mode of operation from spatial motion vector candidates taken from spatial positions around a current coding unit (CU) and a temporal motion vector candidate, where at least one embodiment involves determining the STMVP candidate based on considering at most two spatial positions and based on an average of at least two of the spatial and temporal motion vector candidates.

Abstract: A method, apparatus or system for processing video information can involve determining at least one Rice parameter associated with a transform residual coding process applied during encoding of a block of picture information, wherein the Rice parameter is a fixed value, or is determined based on, for example, a frequency region or a coefficient scanning position for the transform residual coding, or a number of neighbors of the block of picture information, and encoding or decoding the block of picture information based on the at least one Rice parameter.

Abstract: In an encoding apparatus or a decoding apparatus, an encoding method or decoding method combines various coding tools with intra sub partitioning mode in which a coding unit is split in multiple sub partitions. At least one embodiment particularly aims at the selection of primary transforms among a set of multiple transforms for video encoding or decoding of intra sub block partitions. At least one embodiment particularly aims at intra coding using Ma-trix-Based Intra Prediction mode combined with Intra Sub Partition mode. At least one embodiment particularly aims at intra coding using Multi-Reference-Line intra prediction mode combined with Intra Sub Partition mode.

Abstract: A video codec can involve encoding and decoding picture information and first and second flags, wherein the encoding or decoding of the picture information is based on a coding mode indicated by the first flag or the second flag, and the first flag indicates a subblock merge mode and the second flag indicates an inter affine prediction mode, and the encoding or decoding of the first flag uses CABAC coding based on a first probability model and encoding or decoding of the second flag uses CABAC coding based on a second probability model.

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: A method for decoding or encoding comprising: determining if an inter prediction mode called weighted prediction is enabled for a current block; and, if weighted prediction is enabled, modifying a part of a reconstruction process of said current block related to the weighted prediction and/or to at least another prediction tool of a first set of prediction tools, the first set comprising a triangle prediction mode, a geometrical prediction mode, a local illumination compensation mode, a combined intra inter prediction mode, and modes in which motion information used for motion compensation may be refined based on an optical flow model.

Abstract: Some operations associated with transform decoding may provide coding gains for intra-predicted coding blocks but not for coding blocks predicted using certain inter-prediction tools or techniques. These operations may include, for example, multiple transform selection (MTS) and/or transform skip, and the inter-prediction tools or techniques may include one or more of affine motion compensation, combined inter and intra prediction (CIIP), a triangular partition mode (TPM), or a geometric merge mode (GEO). Thus, systems, methods, and instrumentalities associated with versatile video coding may be configured such that the aforementioned operations associated with transform decoding may be disabled for coding blocks that are predicted using one or more the inter-prediction tools or techniques described herein. Many benefits may be derived from disabling these operations including, for example, reduction of encoding time and/or signaling overhead.

Abstract: There is provided a method for estimating weighted prediction parameters intended to be used for predicting an image block.

Abstract: Encoding or decoding picture information can involve determining a coding mode associated with a current coding unit including picture information; determining, based on the coding mode, a first precision level associated with a first portion of a motion vector information associated with the current coding unit, and a second precision level associated with a second portion of the motion vector information; obtaining a motion vector associated with the current coding unit based on the motion vector information and the first and second precision levels; and encoding or decoding at least a portion of the picture information included in the current coding unit based on the coding mode and the motion vector.

Abstract: The disclosure relates to a method for encoding image data, the method including intra-predicting, or predicting by combining inter-prediction and intra-prediction, a first block of the image data by using an intra-prediction mode using a first single transformation obtained by taking account of the first block size. The disclosure also relates to a method for encoding image data, a variable coding length being used for signaling a plurality of Prediction Modes by the encoding, the method comprising:—intra-predicting a first block of the image data by using an intra-prediction mode using a first transformation, the first transformation being obtained by taking account of the first block size, —encoding information signaling a use of the intra-prediction mode in a bitstream, the information being encoded as one of the plurality of Prediction Modes. The disclosure further relates to the corresponding decoding methods, devices and media.

Abstract: A block of video data is split using one or more of several possible partition operations by using the partitioning choices obtained through use of a texture-based image partitioning. In at least one embodiment, the block is split in one or more splitting operations using a convolutional neural network. In another embodiment, inputs to the convolutional neural network come from pixels along the block's causal borders. In another embodiment, boundary information, such as the location of partitions in spatially neighboring blocks, is used by the texture analysis. Methods, apparatus, and signal embodiments are provided for encoding.

Abstract: Coding mode information of a current block is propagated to neighbor blocks even when the coding mode is not selected for a current block. Such propagation may be limited, for example to one block only or to multiple generation of copies. Different propagation modes are proposed: left to right direction, top to bottom direction, bottom-right diagonal direction, first available information, or last coded information. The coding mode propagation allows to improve further predictions since a further block will benefit from the information from its neighbors.

Abstract: Decoding or encoding picture information can involve determining a value associated with a prediction of a pixel of a block of picture information, wherein, the prediction is based on an intra-prediction along a non-diagonal direction, determining, from among a plurality of decoded pixels neighboring the block on the top and the left, at least four reference samples for the block based on the non-diagonal direction, and wherein the determining of the value comprises an interpolation based on a quadratic model and the four reference samples; and decoding or encoding at least a portion of the picture information based on the value.