Abstract: A video codec can involve determining a motion compensation mode associated with encoding a first block of picture information, the motion compensation mode including a sub-block based motion compensation prediction mode or a non-rectangular block partition mode; determining that a second block of picture information spatially neighboring the first block was encoded or decoded based on an illumination compensation; and encoding or decoding the first block based on the motion compensation mode and the illumination compensation.

Abstract: A method includes encoding a first message including first parameters for a first color transform that transforms a video signal into a first color-mapped video signal; encoding a second message including second parameters for a second color transform that transforms the video signal into a second color-mapped video signal; and encoding the video signal, the first message, and the second message in a video bitstream. A method includes decoding the video bitstream into the video signal, the first message including the first parameters, and the second message including the second parameters, and performing at least one of the following: displaying the video signal; transforming the video signal into the first color-mapped video signal by applying the first color transform and displaying the first color-mapped video signal; and transforming the video signal into the second color-mapped video signal by applying the second color transform and displaying the second color-mapped video signal.

Abstract: A device may be configured to perform one or more actions. The device may be configured to obtain a value associated with quantization parameter correction for context-adaptive entropy decoding. The device may be configured to obtain a slope coefficient and an offset coefficient. The device may be configured to determine an initial value of a probability state associated with the context-adaptive entropy decoding based on the slope coefficient, the offset coefficient, and the value associated with the quantization parameter correction. The device may be configured to perform the context-adaptive entropy decoding based on the initial value of the probability state.

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: Apparatuses and methods are disclosed for encoding and decoding data, including video blocks. Techniques disclosed include adapting a decoder-side motion vector refinement (DMVR) process to coding tools with an illumination change. For a video block being encoded or decoded, the DMVR process includes determining that at least one coding tool, of the coding tools with the illumination change, is enabled; and performing the DMVR process, where a distortion metric is selected based on the enabled coding tool.

Abstract: In general, encoding or decoding a picture part can involve a first CABAC probability model associated with a first flag indicating use of an affine mode and a second CABAC probability model associated with a second flag indicating use of either the affine mode or a second mode different from the affine mode, where the first and second CABAC probability models are different and are determined independently.

Abstract: Methods and apparatus for performing in-loop filtering in an encoder or a decoder provide regions which use a common set of filter parameters An index can be sent from an encoder to a decoder indicating which set of filter parameters is to be used for a particular region. The in-loop filter can be Sample Adaptive Offset, Adaptive Loop Filter, or any other such filter. An encoder classifies regions of a picture according to blocks using a common set of filter parameter. The classification can be in the form of a map. Filtering blocks use the common set of filter parameters for a region. A decoder parses a bitstream for a set of filter parameters and an index indicative of the filter parameter set for a region being decoded.

Abstract: Different implementations are described, particularly implementations for video encoding and decoding are presented including a method for deblocking an image. According to an implementation, in a method for deblocking an image, at least one boundary is determined between a first block of samples and a second block of samples; a boundary strength is determined according to at least one of a prediction mode of the first block and a prediction mode of the second block; and samples of the first and second blocks neighboring the at least one boundary are filtered according to the boundary strength. Advantageously, in case the prediction mode of the first block is a weighted prediction mode, the boundary strength further depends on the relative weight of samples used in predicting the first block of samples according to the weighted prediction mode of the first block and reciprocally for the second block.

Abstract: A restricted syntax range per layer in a multi-layer video coding scheme prevents inter-layer conflicts. In one embodiment, adaptive loop filtering sets defined in an adaptive parameter set are distinct in the multiple layers. In another embodiment, a layer identification is also used to uniquely identify the adaptation parameter set. In a related embodiment, a high-level syntax flag indicates whether a layer is independent of other layers.

Abstract: A method and an apparatus for encoding or decoding a video wherein for at least one first block to encode or decode, at least one reference sample is determined based on a coding mode used for reconstructing at least one second block. For instance, intrapadding or motion-compensation of a third block to which the at least one reference sample belong is performed using coding data of the at least one second block. A prediction is then obtained for the at least one first block using the at least one reference sample, and the at least one first block is encoded or decoded based on the prediction.

Abstract: A video coding system may use different types of templates when using template-based prediction modes such as intra template matching prediction mode. The ‘L-shape’ template conventionally used by template-based coding tools may be split into a horizontal ‘above’ (or ‘upper’) template and a vertical ‘left’ template. This allows the encoder to select the appropriate part of the template that better captures statistical properties of the current block and results into improving the coding performance. The use of the type of template is signaled in the encoded data so that the decoder can use the appropriate template for the reconstruction when using a template-based prediction mode such as intra template matching prediction mode.

Abstract: A method comprising obtaining (711) from video data an information allowing determining a picture order count difference between a picture order count of a current reference picture of a list of reference pictures associated to a current picture and a picture order count of the current picture; determining (712) the picture order count difference from the information; and, determining (713) a picture order count of the current reference picture from the picture order count difference; wherein, the determining of the picture order count difference from the information is based at least on a temporal identifier of the current picture.

Abstract: Encoding and decoding methods are disclosed wherein directional intra prediction is used. Each directional intra prediction mode of a given set is associated (S100) with a sum of gradient's values associated with pixels whose direction perpendicular to gradient's direction is the closest to a direction of said directional intra prediction mode and with information representative of a spatial position of each pixel contributing to the sum. At least two directional intra prediction modes are selected (S102) associated with the sums of largest amplitude and at least two predictions of said current picture block are obtained (S107) from them. Finally: the at least two predictions are blended (S108) based on information representative of a spatial position of at least one pixel contributing to the sum associated with at least one of said selected directional intra prediction modes. The current picture block is reconstructed (S110) from the blended prediction.

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: In an example method, for a plurality of octants, residual information is obtained for one or more vertices of the respective octant, where the vertices correspond to respective points in a three-dimensional lookup table. The lookup table is decoded recursively as follows: at least a first one of the plurality of octants is decoded by reconstructing at least a first color sample value from the residual information for at least a first vertex of the first octant; and a plurality of second octants in the plurality of octants are decoded, where the second octants are obtained by splitting the first octant. A color transform is then applied based on the decoded lookup table.

Abstract: A coding block with ISP enabled may include multiple sub-partitions. For a first sub-partition in the coding block, an intra prediction mode may be derived based on the template samples associated with the first sub-partition. The first sub-partition may be decoded based on the intra prediction mode. For a second sub-partition in the coding block, an intra prediction mode may be derived based on the template samples associated with the second sub-partition, and the second sub-partition may be decoded based on that intra prediction mode. The sub-partitions in the coding block may independently derive an intra prediction mode using decoder side intra mode derivation and/or template-based intra mode derivation.

Abstract: Systems, methods, and instrumentalities are disclosed for performing intra prediction of a luminance coding block and/or a chrominance coding block and related signaling when neural network-based intra prediction is enabled. For a current coding block, information representative of a neural network-based prediction mode and a block context may be obtained. A neural network-based predictor may be generated for the current coding block based on the block context and the neural network-based prediction mode. A non-neural network-based intra prediction mode that corresponds to the generated neural network-based predictor may be determined. A prediction mode for a neighboring block may be determined based on the non-neural network-based intra prediction mode.

Abstract: In general, encoding or decoding a picture part can involve a first CABAC probability model associated with a first flag indicating use of an affine mode and a second CABAC probability model associated with a second flag indicating use of either the affine mode or a second mode different from the affine mode, where the first and second CABAC probability models are different and are determined independently.

Abstract: Embodiments disclosed herein generally relate to methods and apparatuses for video coding. For example, methods and apparatuses using decoder-side motion vector refinement (DMVR) technique with bi-prediction weighting for video coding are provided. In an example, a method for video coding includes determining a mode with an illumination change, determining that at least one coding tool for a block is enabled, and performing a DMVR process based on the mode with the illumination change and the at least one coding tool for the block being enabled.

Abstract: A decoding method is disclosed. Information for identifying which pixels (e.g. decoded pixels) are unavailable inside a template of a current block of a picture is obtained. A template-based tool is further applied using the obtained information to determine information to be used for decoding the current block. Finally, the current block is decoded using the determined information.