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    Context modeling of reduced secondary transforms in video
    93.
    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
    95.
    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.

    Implementation aspects in intra block copy in video coding
    98.
    发明授权
    Implementation aspects in intra block copy in video coding 有权

    公开(公告)号：US11516467B2

    公开(公告)日：2022-11-29

    申请号：US17384246

    申请日：2021-07-23

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

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

    IPC: H04N19/176 ,  H04N19/423 ,  H04N19/593 ,  H04N19/105

    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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