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    RESTRICTED UPSAMPLING PROCESS IN MATRIX-BASED INTRA PREDICTION
    101.
    发明申请
    RESTRICTED UPSAMPLING PROCESS IN MATRIX-BASED INTRA PREDICTION 有权

    公开(公告)号：US20220014752A1

    公开(公告)日：2022-01-13

    申请号：US17480208

    申请日：2021-09-21

    Applicant: Beijing Bytedance Network Technology Co., Ltd. ,  Bytedance Inc.

    Inventor： Zhipin DENG ,  Kai ZHANG ,  Li ZHANG ,  Hongbin LIU ,  Jizheng XU

    IPC: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  G06F17/16

    Abstract: Devices, systems and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block using a matrix based intra prediction (MIP) mode, where the conversion includes performing the upsampling operation in which the final prediction block is determined by using a reduced prediction block of the current video block and by using reconstructed neighboring samples of the current video block according to a rule, and where the reduced prediction block is obtained by performing the matrix vector multiplication operation on reduced boundary samples of the current video block.

    SYMMETRIC MOTION VECTOR DIFFERENCE CODING
    105.
    发明申请
    SYMMETRIC MOTION VECTOR DIFFERENCE CODING 有权

    公开(公告)号：US20210385461A1

    公开(公告)日：2021-12-09

    申请号：US17411204

    申请日：2021-08-25

    Applicant: Beijing Bytedance Network Technology Co., Ltd. ,  Bytedance Inc.

    Inventor： Hongbin LIU ,  Li ZHANG ,  Kai ZHANG ,  Zhipin DENG ,  Yue WANG

    IPC: H04N19/137 ,  H04N19/105 ,  H04N19/70 ,  H04N19/176

    Abstract: Symmetric motion vector difference coding is described. One example video processing method includes determining, for a conversion between a block of a current picture of video and a bitstream representation of the block, whether a symmetric motion vector difference (SMVD) mode is allowable for the block, wherein whether the SMVD mode is allowable depends on a derivation process of two target reference pictures of the current picture, which includes a first step for searching a forward target reference picture in the reference picture list 0 and searching a backward target reference picture in the reference picture list 1, and a second step for searching a backward target reference picture in the reference picture list 0 and searching a forward target reference picture in the reference picture list 1, outputs of the first step and the second step being independent of each other; and performing the conversion based on the determination.

    MATRIX DERIVATION IN INTRA CODING MODE
    106.
    发明申请
    MATRIX DERIVATION IN INTRA CODING MODE 有权

    公开(公告)号：US20210385438A1

    公开(公告)日：2021-12-09

    申请号：US17399879

    申请日：2021-08-11

    Applicant: Beijing Bytedance Network Technology Co., Ltd. ,  Bytedance Inc.

    Inventor： Zhipin DENG ,  Kai ZHANG ,  Li ZHANG ,  Hongbin LIU ,  Jizheng XU

    IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/70 ,  H04N19/176

    Abstract: Devices, systems and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block according to a rule, where the rule specifies a relationship between samples of the current video block and matrices or offset values applied in a matrix weighted intra prediction (MIP) mode during the conversion, and where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation.

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