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    CALCULATION IN MATRIX-BASED INTRA PREDICTION
    72.
    发明申请
    CALCULATION IN MATRIX-BASED INTRA PREDICTION 有权

    公开(公告)号：US20220124342A1

    公开(公告)日：2022-04-21

    申请号：US17646412

    申请日：2021-12-29

    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 ,  H04N19/12 ,  H04N19/60 ,  H04N19/117 ,  H04N19/70 ,  H04N19/82 ,  H04N19/186

    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 in which a prediction block of the current video block is determined 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, where the performing the conversion includes deriving, according to a rule, boundary samples by applying a left bit shift operation or a right bit shift operation on a sum of at least one reference boundary sample, and where the rule determines whether to apply the left bit shift or the right bit shift operation.

    BLOCK DIMENSION SETTINGS OF TRANSFORM SKIP MODE
    74.
    发明申请
    BLOCK DIMENSION SETTINGS OF TRANSFORM SKIP MODE 有权

    公开(公告)号：US20220070461A1

    公开(公告)日：2022-03-03

    申请号：US17523167

    申请日：2021-11-10

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

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

    IPC: H04N19/124 ,  H04N19/12 ,  H04N19/127 ,  H04N19/167 ,  H04N19/176 ,  H04N19/70

    Abstract: Devices, systems and methods for lossless coding for visual media coding are described. An exemplary method for video processing includes determining, based on a current video block of a video satisfying a dimension constraint, that coding modes are enabled for representing the current video block in a bitstream representation, where the dimension constraint states that a same set of allowed dimensions for the current video block is disabled for the coding modes, and where, for an encoding operation, the coding modes represent the current video block in the bitstream representation without using a transform operation, or where, for a decoding operation, the coding modes are used to obtain the current video block without using an inverse transform operation; and performing a conversion between the current video block and the bitstream representation of the video based on one of the coding modes.

    CONTEXT CODING FOR MATRIX-BASED INTRA PREDICTION
    75.
    发明申请
    CONTEXT CODING FOR MATRIX-BASED INTRA PREDICTION 有权

    公开(公告)号：US20220014785A1

    公开(公告)日：2022-01-13

    申请号：US17479338

    申请日：2021-09-20

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

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

    IPC: H04N19/593 ,  H04N19/70

    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 encoding a current video block of a video using a matrix intra prediction (MIP) mode in which a prediction block of the current video block is determined 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; and adding, to a coded representation of the current video block, a syntax element indicative of applicability of the MIP mode to the current video block using arithmetic coding in which a context for the syntax element is derived based on a rule.

    CHROMA CODING MODE DETERMINATION BASED ON MATRIX-BASED INTRA PREDICTION
    77.
    发明申请
    CHROMA CODING MODE DETERMINATION BASED ON MATRIX-BASED INTRA PREDICTION 有权

    公开(公告)号：US20210329248A1

    公开(公告)日：2021-10-21

    申请号：US17343980

    申请日：2021-06-10

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

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

    IPC: H04N19/132 ,  H04N19/159 ,  H04N19/70 ,  H04N19/186 ,  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 first determination that a luma video block of a video is coded using a matrix based intra prediction (MIP) mode in which a prediction block of the luma video block is determined 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, performing, based on the first determination, a second determination about a chroma intra mode to be used for a chroma video block associated with the luma video block, and performing, based on the second determination, a conversion between the chroma video block and a bitstream representation of the chroma video block.

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