Abstract: One or more template predictions are generated for a template of a current block based on one or more prediction modes. The template includes neighboring samples of the current block. Each of the one or more template predictions is generated based on a respective one of the one or more prediction modes. One or more filters are derived for the current block. Each of the one or more filters is derived based on (i) filter index information or (ii) a respective one of the one or more template predictions and a template reconstruction of the template. One or more predictions of the current block are determined. Each of the one or more predictions is determined based on a respective one of the one or more prediction modes. A final prediction of the current block is determined by applying the one or more filters to the one or more predictions.

Abstract: An example method of video coding includes receiving a video bitstream comprising a plurality of blocks and a plurality of quantized transform coefficients, and determining a quantized level for a quantized transform coefficient of the plurality of quantized transform coefficients. The method also includes selecting a quantizer from a set of three or more quantizers based on the quantized level, and deriving, using the selected quantizer, a dequantized transform coefficient for a first quantized transform coefficient of the plurality of quantized transform coefficients. The method further includes reconstructing a first block using the dequantized transform value.

Abstract: Aspects of the disclosure includes methods and apparatuses for video decoding and encoding and a method of processing visual media data. The method for video decoding includes receiving coded information in a bitstream indicating that a current block is predicted based on a combination of a plurality of intra prediction modes. The method includes determining a plurality of intra predictions of the current block based on the respective intra prediction modes, determining a fused prediction of the current block based on a weighted summation of the plurality of intra predictions where the weighted summation is according to respective weights associated with the plurality of intra predictions, and reconstructing the current block based on the fused prediction. Each weight is based on one of a plurality of weighting functions that depends on a sample location (x, y) and the intra prediction mode of the intra prediction associated with the respective weight.

Abstract: Some aspects of the disclosure provide a method of video decoding. In an example, a coded video bitstream is received. The coded video bitstream includes coded information of a current block in a current picture. When the current block is predicted in a learning-based prediction mode, a first transform kernel for the current block is determined, the first transform kernel is different from a second transform kernel that is applied when a non-learning based prediction is used on the current block. An inverse transform with the first transform kernel is applied on transform coefficients decoded from the coded video bitstream to obtain a residual block. The current block is reconstructed based on a combination of the residual block and a prediction block of the current block according to the learning-based prediction mode.

Abstract: Some aspects of the disclosure provide a method of video decoding. In an example, a coded video bitstream is received. The coded video bitstream includes coded information of a current block in a current picture. The current block is coded by a non-conventional intra prediction mode that is in a pre-defined set of non-conventional intra prediction modes. A virtual intra prediction mode is derived according to available information associated with the non-conventional intra prediction mode. A transform kernel is selected from at least two transform kernel sets according to the virtual intra prediction mode. The current block is reconstructed based on the transform kernel.

Abstract: A method for video decoding includes for each combination of (i) a pair of vectors in one or more pairs of vectors and (ii) a GPM split mode in a list of GPM split modes, determining a temporary reconstructed block of a current block based on the respective combination and determining a sum of gradients along one of a top boundary and a left boundary of the current block based on (i) boundary samples in the temporary reconstructed block along the one of the top boundary and the left boundary and (ii) respective reconstructed neighboring samples of the current block. A GPM split mode is determined from a plurality of GPM split modes including the list of GPM split modes based at least on the sums of gradients associated with the respective combinations. The current block is reconstructed according to the GPM and the GPM split mode.

Abstract: In a method of video decoding, a coded video bitstream that includes coded information of a current block in a current picture is received. In the method, an initial collocated block position in a collocated picture is determined based on a position of the current block in the current picture. A refined collocated block position of a refined collocated block in the collocated picture is determined based on a search and the initial collocated block position. A reference block in a current reference picture of the current block is determined based on motion information of the refined collocated block. The motion information indicates a collocated reference block in a collocated reference picture of the refined collocated block. In the method, the current block is reconstructed based on the reference block in the current reference picture of the current block.

Abstract: A method of video coding a block of a picture includes: obtaining a residual signal resulting from inter- or intra-picture prediction; inferring use of a DCT2 transform core for a sequence of the residual signal; processing the transformation of the block using the inferred transform core.

Abstract: A video bitstream including coded information of a current block in a current picture of a video is received. The coded information indicates that a subblock-level cross-component model (CCM) is applied to the current block. A luma prediction block and a chroma prediction block for the current block are determined based on a prediction mode. The luma prediction block includes a plurality of luma prediction subblocks and the chroma prediction block includes a plurality of chroma prediction subblocks. The subblock-level CCM is determined based on a first luma prediction subblock of the plurality of luma prediction subblocks and a first chroma prediction subblock of the plurality of chroma prediction subblocks that corresponds to the first luma prediction subblock. A first chroma subblock of the current block is reconstructed based on the first chroma prediction subblock, the subblock-level CCM, and the first luma prediction subblock.

Abstract: A method for video decoding includes receiving a bitstream including coded information indicating that a current chroma block is filtered with cross-component filtering. One or more cross-component filtering models are determined based on first luma samples in a current luma block that is collocated with a current chroma block and based on first chroma samples of the current chroma block. A second luma sample is obtained by filtering one of the first luma samples with a luma in-loop filter. A cross-component filtering model of the one or more cross-component filtering models is then determined based on the second luma sample. The cross-component filtering model is applied to the second luma sample to obtain a cross-component filtered value. A second chroma sample is obtained based on the cross-component filtered value and one of the first chroma samples that is collocated with the one of the first luma samples.

Abstract: Coded information indicates that a bi-directional subblock-based spatial motion vector prediction (SbSMVP) is applied to a current block. A first subblock motion vector field is determined based on a plurality of top neighboring subblocks positioned at a top side of the current block. A second subblock motion vector field is determined based on a plurality of side neighboring subblocks positioned at a left side of the current block. According to a spatial direction, a motion vector for a first subblock of the current block is determined based on at least one of a first motion vector determined from the first subblock motion vector field and a second motion vector determined from the second subblock motion vector field. The first subblock of the current block is reconstructed based on the determined motion vector for the first subblock.

Abstract: The present disclosure relates to methods and devices to be employed for encoding and decoding of image or video signal. They include determination of whether or not the size of a current block is larger than a minimum allowed quadtree leaf node size. If the size of the current block is not larger than the minimum allowed quadtree leaf node size, multi-type tree splitting is applied to the current block. The minimum allowed quadtree leaf node size is not larger than a maximum allowed binary tree root node size or the minimum allowed quadtree leaf node size is not larger than a maximum allowed ternary tree root node size.

Abstract: An example method of video coding includes receiving a video bitstream for a plurality of blocks. When an extrapolation filter-based intra prediction (EIP) mode is active for a current block of the plurality of blocks, the method also includes determining, when a boundary condition is met for the current block, one or more EIP mode parameters from a first set of EIP parameters. When the boundary condition is not met for the current block, the method also includes determining the one or more EIP mode parameters from a second set of EIP parameters, where the second set of EIP parameters includes one or more parameters not included in the first set of EIP parameters. The method further includes reconstructing the current block using the one or more EIP mode parameters.

Abstract: The present disclosure provides methods and devices of construct a candidate merge list for Intra block copy (IBC) mode, the method comprising: inserting a block vector of a left neighboring block of a current block into an initial merge list, when the left neighboring block is available and the left neighboring block is using IBC mode; inserting a block vector of an above neighboring block of the current block into the initial merge list, when the above neighboring block is available, the above neighboring block is using IBC mode and the block vector of the above neighboring block is not same as the block vector of the left neighboring block; inserting a block vector of the last candidate in a history based motion vector predictor (HMVP) into the initial merge list; obtaining a block vector of the current block according to the initial merge list.

Abstract: A method of coding implemented by a decoding device, comprising: setting a value of candidate intra prediction mode of a current block to be a default value, wherein the current block is predicted using an intra prediction mode but not a Matrix-based Intra Prediction (MIP) mode and a neighboring block adjacent to the current block is used to derive the value of candidate intra prediction mode of the current block and is predicted using MIP mode; obtaining a value of the intra prediction mode of the current block according to the default value.

Abstract: Devices and methods for Intra prediction are provided. The method includes: obtaining a value of an indication information of a current block. When the value of the indication information indicates the intra prediction mode of the current block is not comprised in the set of most probable modes, deriving the intra prediction mode IntraPredModeY of the current block by the following ordered steps: i. IntraPredModeY is set equal to intra_luma_mpm_remainder[xCb][yCb], ii. The value of IntraPredModeY is incremented by one. The method can improve the efficiency to determine the intra prediction mode of the current block.

Abstract: A method includes receiving a bitstream that includes coded information of a sequence of pictures. The coded information indicates an inter prediction of a current block in a current picture, and an adjustment factor to a linear formula that is used in a formula-based inter prediction of the inter prediction. The formula-based inter prediction generates a prediction sample of the current block based on a linear formula with one or more reconstructed samples in a reference block being input to the linear formula, the linear formula includes one or more parameters derived based on a current template of the current block and a reference template of the reference block. The method also includes applying the adjustment factor on the linear formula to generate an adjusted linear formula, and determining at least a reconstructed sample of the current block according to the adjusted linear formula.

Abstract: A method for operating a two-dimensional (2D) separable interpolation filter for coding a video, wherein the two-dimensional separable interpolation filter comprises a first and a second one-dimensional (1D) interpolation filter and a temporal buffer of a predetermined buffer size, wherein the method comprises: obtaining filter coefficients for the first one-dimensional interpolation filter of the two-dimensional interpolation filter; comparing a sum of positive filter coefficients of the obtained filter coefficients with a threshold; and upon determining that the sum of positive filter coefficients is larger than the threshold, amending one or more of the filter coefficients to obtain amended filter coefficients, wherein the one or more filter coefficients are amended such that a sum of positive filter coefficients of the amended filter coefficients is not larger than the threshold; applying the amended filter coefficients to samples of the video to obtain a value of a fractional sample position of the video

Abstract: Disclosed is an energy-balanced and efficient routing method that adopts a power control mechanism to reduce energy consumption, and the method involves two phases: routing establishment phase and data forwarding phase. In the routing establishment phase, a sink node broadcasts a beacon packet at a maximum transmission power to establish an initial path, and a receiving node updates the routing table according to beacon information and forwards the beacon packet. In the data forwarding phase, the present disclosure provides a new forwarding factor, which gives comprehensive consideration to energy efficiency and energy balance, selects a node with high energy efficiency and sufficient energy an optimal next-hop node, thereby extending the life cycle of the network. Further provided is a data protection and network recovery mechanism. Topological changes of the network, data forwarding failures and other problems caused by node movement can be solved.

Abstract: Apparatuses and methods for encoding and decoding a video are provided. The method includes determining whether at least one of two blocks of an image in a video is predicted with a combined inter-intra prediction (CIIP), where the two blocks include a first block (block Q) and a second block (block P). There is a boundary between the two blocks. The method further includes setting a boundary strength (Bs) for the boundary to a first value when at least one of the two blocks is predicted with the CHIP, and performing deblocking filter based on the Bs.