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    Matrix-based intra prediction using upsampling
    281.
    发明授权
    Matrix-based intra prediction using upsampling 有权

    公开(公告)号：US11570441B2

    公开(公告)日：2023-01-31

    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.

    Quantization parameter derivation for palette mode
    282.
    发明授权
    Quantization parameter derivation for palette mode 有权

    公开(公告)号：US11563946B2

    公开(公告)日：2023-01-24

    申请号：US17698968

    申请日：2022-03-18

    Applicant: Bytedance Inc.

    Inventor： Weijia Zhu ,  Jizheng Xu ,  Li Zhang

    IPC: H04N19/70 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186

    Abstract: Methods, systems, and devices for quantization parameter derivation in palette mode coding and decoding are described. An example method for video processing includes determining, for a conversion between a current block of a video and a bitstream representation of the video, that the current block is coded using a palette mode and an escape symbol value is signaled in the bitstream representation, and performing, based on the determining, the conversion, wherein a clipped quantization parameter for the current block is used in the conversion, and wherein the clipped quantization parameter used for a chroma component of the video is derived based on a quantization parameter subsequent to a mapping operation of a quantization process or a dequantization process.

    Context coding for matrix-based intra prediction
    288.
    发明授权
    Context coding for matrix-based intra prediction 有权

    公开(公告)号：US11546633B2

    公开(公告)日：2023-01-03

    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.

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