Tencent America LLC

Qualcomm Incorporated

Tencent Technology (shenzhen) Company Limited

Xiang Li

Shan Liu

Xin Zhao

Guichun Li

Xiaozhong Xu

Liang Zhao

Ling Li

Cheung Auyeung

Meng Xu

Byeongdoo Choi

Stephan Wenger

Marta Karczewicz

Jianle Chen

Jing Ye

Kai Zhang

Li Feng Zhang

Ye-Kui Wang

Hongbin Liu

Hsiao-Chiang Chuang

Vadim Seregin

Wei-Jung Chien

Adarsh Krishnan Ramasubramonian

Rajan Laxman Joshi

Geert Van Der Auwera

Joel Sole Rojals

Lien-Fei Chen

Yixin Du

Hong Zhang

Madhu Peringassery Krishnan

Yi-Wen Chen

Anish Tamse

Dmytro Rusanovskyy

Krishnakanth Rapaka

Liwei Guo

Wei Pu

Cheng-Teh Hsieh

Michael Robert Turner

Chao Pang

Feng Zou

Ying Chen

Sungwon Lee

Robert Owen Hughes

Yang Yu

Steven Richard Brunette

Thuong Nguyen Canh

Guoxin Jin

Charles J Bieberich

Yeqing Wu

Yu-Chen Sun

Delphine Collin

Tejashree Joglekar

Johanna Bakonyi

Bin Zhu

Lienfei Chen

Zhongzheng Yuan

Robert Sibley

Lifen Wu

Shuang Liang

Pang Chao

Done Bugdayci Sansli

Qiang Zhang

A method and apparatus for selecting an intra interpolation filter for multi-line intra prediction based on a reference line index for decoding a video sequence includes identifying a set of reference lines associated with a coding unit. A first type of interpolation filter is applied to reference samples included in a first reference line, of the set of reference lines, that is adjacent to the coding unit to generate a first set of prediction samples based on the first reference line being associated with a first reference line index. A second type of interpolation filter is applied to reference samples included in a second reference line, of the set of reference lines, that is non-adjacent to the coding unit to generate a second set of prediction samples based on the second reference line being associated with a second reference line index.

Intra interpolation filter for multi-line intra prediction

A method for video decoding includes decoding prediction information that indicates a partition of the current block and indicates an index indicating a first intra prediction mode in a first set of intra prediction modes for a first partition of the current block. The method further includes, when the first partition has a non-square shape, remapping the first intra prediction mode to a second intra prediction mode based on an aspect ratio of the first partition. When the aspect ratio of the first partition is out of a specific range, a number of intra prediction modes in the first set of intra prediction modes that are replaced by wide-angle intra prediction modes is fixed to a pre-defined number. The method further includes decoding at least the first partition according to the first intra prediction mode or the second intra prediction mode.

Mapping wide angle modes to intra prediction modes for a partition of a coding block

In a method of video decoding at a video decoder, a bitstream of a coded video associated with a current coding block that is partitioned into a first part and a second part along a partition edge for prediction in a geometric partitioning mode is received. A weight index at a sample position of the current coding block is determined based on a look up table. The weight index is used to derive a blending weight for blending two prediction signals corresponding to the first part and the second part of the current coding block. A stored motion vector type for a first motion storage unit in a motion field of the current coding block is determined based on a motion index of the first motion storage unit. A motion vector of the first motion storage unit is stored based on the stored motion vector type.

Weight derivation for geometric partitioning mode

Aspects of the disclosure provide method and apparatus for video coding. In some examples, an apparatus includes processing circuitry. The processing circuitry decodes prediction information of a first block from a coded video bitstream. The first block is a non-square block and the prediction information for the first block is indicative of a first intra prediction mode in a first set of intra prediction modes for a square block. Then, the processing circuitry remaps the first intra prediction mode to a second intra prediction mode in a second set of intra prediction modes that is used for the non-square block. The second set of intra prediction modes includes at least the second intra prediction mode that is not in the first set of intra prediction modes. Further, the processing circuitry reconstructs at least one sample of the first block according to the second intra prediction mode.

Wide-angle intra prediction for non-square blocks

In a method for video decoding in a video decoder, prediction information of a current block in a coded bitstream is decoded. The prediction information indicates that template matching (TM) is applied with a merge mode with motion vector difference (MMVD) mode and indicates motion vector difference (MVD) information of the current block. Using the MMVD mode, one or more MVD candidates is determined based on the MVD information. TM is performed to search for a matched MVD between a current template of the current block and a reference template of a reference block of the current block based on the one or more MVD candidates determined using the MMVD mode. The current block is reconstructed based on a motion vector (MV) that is a summation of a motion vector predictor (MVP) and the matched MVD.

Template matching with merge mode with motion vector difference

A method and apparatus for partitioning a block to permit the encoding or decoding of a video sequence includes partitioning the block using a split-to-square partition pattern, a horizontal binary tree partition pattern, or a horizontal ternary tree partition pattern to generate a set of sub-blocks, wherein a same priority is allocated to the split-to-square partition pattern, the horizontal binary tree partition pattern, and the horizontal ternary tree partition pattern such that the split-to-square partition pattern may be used before, after, or interleaved with the horizontal binary tree partition pattern and the horizontal ternary tree partition pattern. Encoding or decoding the video sequence is performed based on partitioning the block using the split-to-square partition pattern, the horizontal binary tree partition pattern, or the horizontal ternary tree partition pattern.

Flexible tree structure

Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. For example, the processing circuitry decodes prediction information of a current block from a coded video bitstream. The prediction information indicates that a prediction of the current block is at least partially based on an inter prediction. Then, the processing circuitry reconstructs at least a sample of the current block as a combination of a result from the inter prediction and neighboring samples of the block that are selected based on a position of the sample.

Method and apparatus for video coding

Aspects of the disclosure provide methods and apparatuses for video encoding and/or decoding. In some examples, an apparatus for video decoding includes processing circuitry that can decode coded information of a transform block (TB) from a coded video bitstream. The coded information indicates a region of the TB on which a secondary transform is applied. The region includes a first sub-region having transform coefficients calculated by the secondary transform and a second sub-region that is a zero-out region. In response to a determination that a neighboring transform coefficient is in the second sub-region and a current transform coefficient in the TB is not in the second sub-region, the processing circuitry determines the current transform coefficient according to a default value for the neighboring transform coefficient. The processing circuitry reconstructs a sample in the TB based on the transform coefficient for the sample.

Transform coefficient zero-out

Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes receiving circuitry and processing circuitry. The processing circuitry receives coded information of a block that is encoded in a palette based coding mode. The block is a beginning of a predefined coding region that includes one or more coding tree units (CTUs). The processing circuitry further determines a palette for the block independently of palette information of one or more previously decoded blocks of the palette based coding mode, and decodes pixels of the block based on the coded information of the block and the determined palette for the block.

Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes receiving circuitry and processing circuitry. The processing circuitry receives a bitstream carrying a plurality of pictures, and determines at least a motion compensation padding (MCP) block that is located in an MCP area outside of a picture and next to a picture boundary of the picture. The processing circuitry derives, according to a plurality of candidates with positions located at the picture boundary within the picture, a motion vector of the MCP block for motion compensated boundary padding, and reconstructs at least a sample in the MCP block according to the derived motion vector for the motion compensated boundary padding.

On motion compensated picture boundary padding

Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. The processing circuitry extracts, from a bitstream, merge with motion vector difference (MMVD) candidate information for a current block in a current picture. The processing circuitry generates a first MV refinement offset associated with a first motion vector for the MMVD candidate based on a refined step size and a plurality of refinement positions. The processing circuitry derives a first refined motion vector (MV) value associated with a MMVD candidate according to the MMVD candidate information and the generated first MV refinement offset. The processing circuitry reconstructing the current block according to a first reference block in a first reference picture, the first reference block is indicated by the derived first refined MV value.

MMVD candidate refinement methods

Aspects of the disclosure provide a method and an apparatus including processing circuitry that adds merge candidates into a merge candidate list of a current block in a current picture. The merge candidates include available merge candidates including one or more of spatial motion vector predictors (MVP(s)), temporal MVP(s), non-adjacent MVP(s), history-based MVP(s), and pairwise average MVP(s). Whether the merge candidate list includes all available SMVP, TMVP, NA-MVP, HMVP, and PAMVP, and no merge candidate in the merge candidate list has a zero motion vector (zero MV) are determined. If the merge candidate list includes all available SMVP, TMVP, NA-MVP, HMVP, and PAMVP, and no merge candidate in the merge candidate list has the zero MV, the merge candidate having the zero MV is added to the merge candidate list. Merge candidates in the merge candidate list including the merge candidate having the zero MV are reordered using template matching.

Zero motion vector in adaptive reordering of merge candidates (ARMC)

Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes receiving circuitry and processing circuitry. The processing circuitry determines, a use of an inherited context initialization in a context-based adaptive binary arithmetic coding (CABAC) for decoding a current portion of a video sequence carried by a bitstream. The processing circuitry decodes, from the bitstream, a syntax value that indicates a decoded portion in the video sequence for a context inheriting, and initializes context models for the CABAC based on stored context states associated with the decoded portion. Further, the processing circuitry decodes, the current portion from the bitstream according to the context models that are initialized based on the stored context states associated with the decoded portion.

CABAC inherited context initialization

In a method for video decoding in a decoder, reconstructed samples of a reconstructed block of a picture are stored. When a current sub-block in a current block of the picture is to be reconstructed using intra block copy (IBC) based on a reference sub-block in the reconstructed block, the reference sub-block for the current sub-block is identified, whether the reconstructed samples of the reference sub-block stored are indicated as overwritten is determined based on a position of the current sub-block, reconstructed samples of the current sub-block for output are generated based on the reconstructed samples of the reference sub-block when the reconstructed samples of the reference sub-block stored are determined to be indicated as not overwritten, and the reconstructed samples of a collocated sub-block in the reconstructed block stored are overwritten with the generated reconstructed samples of the current sub-block.

Intra block copy search range

A method of and an apparatus for controlling intra prediction for decoding of a video sequence are provided. The method may include based on a reference line index signaling a first reference line nearest to a coding unit, among a plurality of reference lines adjacent to the coding unit, applying intra smoothing on one or more first reference lines comprising the first reference line, among the plurality of reference lines, and based on the intra smoothing being applied on the one or more first reference lines, applying a position-dependent intra prediction combination (PDPC) on one or more third reference lines comprising the first reference line, among the plurality of reference lines, while preventing application of the PDPC on one or more fourth reference lines other than the one or more third reference lines, among the plurality of reference lines.

Multi-line intra prediction

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Saratoga, CA, United States of America

Xiang Li