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    Matrix-based intra prediction using upsampling
    111.
    发明授权
    Matrix-based intra prediction using upsampling 有权

    公开(公告)号：US11616957B2

    公开(公告)日：2023-03-28

    申请号：US17479360

    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: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  G06F7/78 ,  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 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 followed by an upsampling operation, where the upsampling operation is performed, in both a vertical direction and a horizontal direction in a fixed order, on samples obtained from the matrix vector multiplication operation.

    BLOCK DIMENSION SETTINGS OF TRANSFORM SKIP MODE
    115.
    发明申请
    BLOCK DIMENSION SETTINGS OF TRANSFORM SKIP MODE 有权

    公开(公告)号：US20230074729A1

    公开(公告)日：2023-03-09

    申请号：US17977433

    申请日：2022-10-31

    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 modeling of reduced secondary transforms in video
    118.
    发明授权
    Context modeling of reduced secondary transforms in video 有权

    公开(公告)号：US11575940B2

    公开(公告)日：2023-02-07

    申请号：US17400464

    申请日：2021-08-12

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

    Inventor： Li Zhang ,  Kai Zhang ,  Hongbin Liu ,  Yue Wang

    IPC: H04N19/61 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70 ,  H04N19/11 ,  H04N19/12 ,  H04N19/124

    Abstract: A video processing method is provided to include: performing a conversion between a current video block of a video and a coded representation of the video, wherein the performing of the conversion includes configuring, based on a characteristic of the current video block of a video, a context model for coding a bin or bypass coding the bin of a bin string corresponding to an index of a secondary transform tool, wherein the index indicates an applicability of the secondary transform tool and/or a kernel information of the secondary transform tool, and wherein the secondary transform tool includes applying, during encoding, a forward secondary transform to an output of a forward primary transform applied to a residual of a video block prior to quantization, or wherein the secondary transform tool includes applying, during decoding, an inverse secondary transform to an output of dequantization to the video block before applying an inverse primary transform.

    DIRECTION-BASED PREDICTION FOR INTRA BLOCK COPY IN VIDEO CODING
    120.
    发明申请
    DIRECTION-BASED PREDICTION FOR INTRA BLOCK COPY IN VIDEO CODING 有权

    公开(公告)号：US20230014129A1

    公开(公告)日：2023-01-19

    申请号：US17896761

    申请日：2022-08-26

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

    Inventor： Jizheng Xu ,  Li Zhang ,  Kai Zhang ,  Hongbin Liu ,  Yue Wang

    IPC: H04N19/132 ,  H04N19/176 ,  H04N19/423 ,  H04N19/96

    Abstract: A method of visual media processing includes determining, for a conversion between a current video block of visual media data and a bitstream representation of the current video block, a buffer that stores reference samples for prediction in an intra block copy mode; for a sample spatially located at location of the current video block relative to an upper-left position of a coding tree unit including the current video block and having a block vector, computing a corresponding reference in the buffer at a reference location, wherein the reference location is determined using the block vector and the location; and upon determining that the reference location lies outside the buffer, re-computing the reference location based at least in part on a location of the current video block relative to the coding tree unit including the current video block.

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