Abstract: A method for decoding a video includes: a first colour component neighboring reference value, a second colour component neighboring reference value and a first colour component reconstructed value corresponding to a current block are obtained; a second colour component predicted value corresponding to the current block is generated at least based on a linear model corresponding to factors, where the factors are determined by at least one of a weight coefficient, the first colour component neighboring reference value, or the second colour component neighboring reference value; and the video is decoded based on the second colour component predicted value. The method further includes: neighboring reference samples are downsampled to determine part of reference samples.

Abstract: A point cloud decoding method is applied to a decoder and includes the following. Reconstructed attribute information of occupied neighbouring nodes of a current node and reconstructed attribute information of occupied same-level neighbouring child nodes of a child node of the current node are determined. An attribute prediction value of the child node of the current node is determined according to the reconstructed attribute information of the occupied neighbouring nodes and the reconstructed attribute information of the occupied same-level neighbouring child nodes of the child node of the current node. A first transformed coefficient is determined by performing region adaptive hierarchal transform (RAHT) on the attribute prediction value, and reconstructed attribute information of the child node of the current node is determined according to the first transformed coefficient.

Abstract: Disclosed in embodiments of the present application are an encoding method, a decoding method, a code stream, an encoder, a decoder, and a storage medium. The decoding method comprises: an encoder determines a first template corresponding to a current block; determines, according to the first template, one or more block vectors corresponding to the current block; determines one or more reference blocks of the current block according to the one or more block vectors, and determines a predicted value of the current block according to the one or more reference blocks; and determines a reconstruction value of the current block according to the predicted value of the current block.

Abstract: Disclosed are a coding method, a decoding method, and a decoding device. The decoding method includes: determining a reference sample value of a first color component of the current block; according to the reference sample value of the first color component of the current block, determining a weighting coefficient by means of a neural network model, wherein an input for the neural network model comprises the reference sample value of the first color component of the current block; according to the weighting coefficient and a reference sample value of a second color component of the current block, determining a predicted block of the second color component of the current block; and according to the predicted block, determining a reconstructed value of a sampling point of the second color component of the current block.

Abstract: Provided in implementations of the present application are a filtering method and apparatus, and a computer storage medium; the method comprises: acquiring pixel information to be filtered; determining edge information; and inputting the sample information to be filtered and the edge information into a neural network-based filter so as to output filtered pixels, the filter being obtained by an online filtering part combined with an offline filtering part.

Abstract: Disclosed are a transformation method, an encoder, a decoder, and a storage medium. The transformation method applied to an encoder includes: determining a prediction mode parameter of a current block; determining a Matrix-based Intra Prediction (MIP) parameter when the prediction mode parameter indicates that MIP is used for the current block to determine an intra prediction value; determining an intra prediction value of the current block according to the MIP parameter and calculating a residual value between the current block and the intra prediction value; determining a Low-Frequency Non-Separable Transform (LFNST) transform kernel used for the current block according to the MIP parameter when an LFNST is used for the current block, setting an LFNST index, and signalling the LFNST index in a video bitstream; and performing a transform processing on the residual value by using the LFNST transform kernel.

Abstract: A point cloud decoding method includes that: a decoder decodes a bitstream, and determines all planar flag information of a current node; in a case where the all planar flag information indicates that occupied child-nodes of the current node constitute planes in all of three preset spatial directions, the decoder decodes the bitstream to determine three pieces of plane position information of the current node in the three preset spatial directions and determines reconstructed geometry information of the current node; in a case where the all planar flag information indicates that occupied child-nodes of the current node do not all constitute planes in three preset spatial directions, the decoder decodes the bitstream to determine first planar flag information of the current node in a first spatial direction and second planar flag information of the current node in a second spatial direction, and determines reconstructed geometry information of the current node.

Abstract: A decoding method includes: determining a reference value of a first color component of a current block and a reference value of a second color component of the current block; determining a weighting coefficient according to the reference value of the first color component; determining a reference average value of the second color component according to the reference value of the second color component; determining a reference sample value of the second color component according to the reference value and the reference average value of the second color component; determining a predicted value of a sample of the second color component in the current block according to the reference average value and the reference sample value of the second color component, and the weighting coefficient; and determining a reconstructed value of the sample of the second color component in the current block according to the predicted value.

Abstract: Provided are a coding method, a decoding method, a bitstream, a coder, a decoder and a storage medium. The method includes: determining a first BV parameter of a current block; on the basis of the first BV parameter, determining a first color-component reference sample and a second color-component reference sample which correspond to the current block, and based on the first color-component reference sample and the second color-component reference sample, establishing a mapping relationship between a first color component and a second color component; and based on the mapping relationship and a sample value of the first color component of the current block, determining a predicted value of the second color component of the current block. In this way, the accuracy of chroma prediction can be improved, the bit rate is reduced, and the codec efficiency can also be improved.

Abstract: A method for intra prediction includes: obtaining multiple previously reconstructed neighbouring blocks corresponding to a current processing block; determining prediction modes, that are signalled in a bitstream, corresponding to neighbouring blocks of the multiple previously reconstructed neighbouring blocks, to obtain multiple first prediction modes; if the multiple first prediction modes include at least two directional modes, taking directional modes included in the multiple first prediction modes as first prediction directions; performing, according to a preset operation rule, operation on multiple first prediction directions of the first prediction directions to obtain second prediction directions; obtaining a prediction mode set according to the second prediction directions and the multiple first prediction modes; and performing intra prediction on the current processing block based on the prediction mode set.

Abstract: A decoding method, an encoding method, and a non-transitory computer-readable storage medium are provided. The decoding method includes the following. Whether to split a current node in a current point cloud is determined. A motion parameter of the current node is determined by decoding a bitstream in the case where the current node is not to be split. A compensation node for the current node is determined by performing motion compensation on a reference node for the current node based on the motion parameter of the current node. A prediction node for the current node is determined based on the compensation node for the current node. Geometric position information of the current point cloud is determined based on the prediction node for the current node.

Abstract: A method for reading a bitstream, a method for storing a bitstream and a method for transmitting a bitstream are provided. The method includes: a bitstream is read, and the following operations are executed to decode the bitstream: acquiring a luma component neighboring reference value, a chroma component neighboring reference value and a luma component reconstructed value corresponding to a current block; generating a chroma component predicted value corresponding to the current block at least based on a linear model corresponding to a factor; and decoding a video based on the chroma component predicted value.

Abstract: A method for reading a bitstream, a method for storing a bitstream and a method for transmitting a bitstream are provided. The method includes: a bitstream is read, and the following operations are executed to decode the bitstream: obtaining a luma component neighboring reference value and a luma component reconstructed value corresponding to a current block, wherein the luma component neighboring reference value represents a luma component parameter corresponding to a neighboring reference sample of the current block; determining a weight coefficient corresponding to the neighboring reference sample; determining a scaling factor according to the weight coefficient and the luma component neighboring reference value; and obtaining a chroma component predicted value corresponding to the current block based on a linear model corresponding to the scaling factor.

Abstract: A method for reading a bitstream, a method for storing a bitstream and a method for transmitting a bitstream are provided. The method includes: a bitstream is read, and the following operations are executed to decode the bitstream: acquiring a luma component neighboring reference value and a luma component reconstructed value corresponding to a current block, wherein the luma component neighboring reference value is indicative of a luma component parameter corresponding to a neighboring reference sample of the current block; generating a chroma component predicted value corresponding to the current block at least based on a weight coefficient corresponding to the neighboring reference sample related to a position of the current block and the neighboring reference sample; and decoding a video based on the chroma component predicted value.

Abstract: Disclosed are a colour component prediction method, an encoder, a decoder, and a storage medium. The method includes: determining adjacent reference pixels of a current block in a picture; constructing a subset of adjacent reference pixels according to the adjacent reference pixels, wherein the subset of adjacent reference pixels contains a part of the adjacent reference pixels; and calculating model parameters of a prediction model according to the subset of adjacent reference pixels, wherein the prediction model includes N prediction sub-models, the N prediction sub-models correspond to N groups of model parameters, and the prediction sub-models are used to perform, through corresponding model parameters, cross-component prediction of colour components to be predicted.

Abstract: An information processing method and device, an apparatus, and a storage medium. The method includes: for inputted source video data, predicting a colour component of a coding block in the source video data according to a prediction mode to obtain a first prediction block, wherein the prediction mode is preset and is a Position-Dependent Prediction Combination (PDPC) application mode; determining a difference between the colour component of the coding block and a prediction value of the first prediction block to obtain a residual block; and signalling the residual block and the prediction mode in a bitstream.

Abstract: Disclosed are a colour component prediction method, an encoder, a decoder, and a storage medium. The method includes: determining adjacent reference pixels of a current block in a picture; constructing a subset of adjacent reference pixels according to the adjacent reference pixels, wherein the subset of adjacent reference pixels contains a part of the adjacent reference pixels; and calculating model parameters of a prediction model according to the subset of adjacent reference pixels, wherein the prediction model includes N prediction sub-models, the N prediction sub-models correspond to N groups of model parameters, and the prediction sub-models are used to perform, through corresponding model parameters, cross-component prediction of colour components to be predicted.

Abstract: Colour component prediction method is provided, which includes that: first reference sample set corresponding to colour component to be predicted of coding block in video image is acquired; when available sample number in first reference sample set is less than preset number, preset component value is taken as predicted value corresponding to the colour component to be predicted; when available sample number in first reference sample set is not less than preset number, first reference sample set is screened to obtain second reference sample set; when available sample number in second reference sample set is equal to preset number, model parameter is determined through second reference sample set, and prediction model corresponding to colour component to be predicted is obtained based on model parameter, prediction model is used for prediction processing of colour component to be predicted to obtain predicted value corresponding to colour component to be predicted.

Abstract: An encoding method, a decoding method, and a decoder are provided. The method includes the following. A prediction parameter of a current block is determined, where the prediction parameter includes a prediction mode parameter. Neighbouring sample values of the current block are obtained and matrix-based intra prediction (MIP) input sample values of the current block are determined according to the neighbouring sample values of the current block, when the prediction mode parameter indicates that an MIP mode is used to determine an intra prediction value of a colour component of the current block. An MIP prediction value of the colour component of the current block is determined according to the MIP input sample values, an MIP weighting matrix, a shifting offset parameter, and a shifting number parameter. The intra prediction value of the colour component of the current block is determined by filtering the MIP prediction value.

Abstract: Colour component prediction method is provided, which includes that: first reference sample set corresponding to colour component to be predicted of coding block in video image is acquired; when available sample number in first reference sample set is less than preset number, preset component value is taken as predicted value corresponding to the colour component to be predicted; when available sample number in first reference sample set is not less than preset number, first reference sample set is screened to obtain second reference sample set; when available sample number in second reference sample set is equal to preset number, model parameter is determined through second reference sample set, and prediction model corresponding to colour component to be predicted is obtained based on model parameter, prediction model is used for prediction processing of colour component to be predicted to obtain predicted value corresponding to colour component to be predicted.