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    EFFICIENT CONTEXT MODEL COMPUTATION DESIGN IN TRANSFORM COEFFICIENT CODING
    1.
    发明申请
    EFFICIENT CONTEXT MODEL COMPUTATION DESIGN IN TRANSFORM COEFFICIENT CODING 有权

    公开(公告)号：US20210084336A1

    公开(公告)日：2021-03-18

    申请号：US17106898

    申请日：2020-11-30

    Applicant: GOOGLE LLC

    Inventor： Jingning Han ,  James Zern ,  Linfeng Zhang ,  Ching-Han Chiang ,  Yaowu Xu

    IPC: H04N19/60 ,  H04N19/129 ,  H04N19/88 ,  H04N19/184 ,  H04N19/13

    Abstract: A processor is configured to maintain, for encoding current values related to the transform coefficients a first line buffer and a second line buffer. The current values are arranged along a current scan-order anti-diagonal line. The first line buffer includes first values of a first scan-order anti-diagonal line. The second line buffer includes second values of a second scan-order anti-diagonal line. The processor is further configured to interleave the first values and the second values in a destination buffer; select, using the destination buffer, a probability distribution for coding a current value of the current values; entropy encode, in a compressed bitstream, the current value using the probability distribution; and replace, for coding values of an immediately subsequent scan-order anti-diagonal line to the current scan-order anti-diagonal line, one of the second line buffer or the first line buffer with the current scan-order anti-diagonal line.

    Efficient context model computation design in transform coefficient coding
    2.
    发明授权
    Efficient context model computation design in transform coefficient coding 有权

    公开(公告)号：US11405646B2

    公开(公告)日：2022-08-02

    申请号：US17106898

    申请日：2020-11-30

    Applicant: GOOGLE LLC

    Inventor： Jingning Han ,  James Zern ,  Linfeng Zhang ,  Ching-Han Chiang ,  Yaowu Xu

    IPC: H04N19/60 ,  H04N19/129 ,  H04N19/88 ,  H04N19/184 ,  H04N19/13

    Abstract: A processor is configured to maintain, for encoding current values related to the transform coefficients a first line buffer and a second line buffer. The current values are arranged along a current scan-order anti-diagonal line. The first line buffer includes first values of a first scan-order anti-diagonal line. The second line buffer includes second values of a second scan-order anti-diagonal line. The processor is further configured to interleave the first values and the second values in a destination buffer; select, using the destination buffer, a probability distribution for coding a current value of the current values; entropy encode, in a compressed bitstream, the current value using the probability distribution; and replace, for coding values of an immediately subsequent scan-order anti-diagonal line to the current scan-order anti-diagonal line, one of the second line buffer or the first line buffer with the current scan-order anti-diagonal line.

    EFFICIENT CONTEXT MODEL COMPUTATION DESIGN IN TRANSFORM COEFFICIENT CODING
    5.
    发明公开
    EFFICIENT CONTEXT MODEL COMPUTATION DESIGN IN TRANSFORM COEFFICIENT CODING 审中-公开

    公开(公告)号：US20240276015A1

    公开(公告)日：2024-08-15

    申请号：US18641482

    申请日：2024-04-22

    Applicant: GOOGLE LLC

    Inventor： Jingning Han ,  James Zern ,  Linfeng Zhang ,  Ching-Han Chiang ,  Yaowu Xu

    IPC: H04N19/60 ,  H04N19/129 ,  H04N19/13 ,  H04N19/184 ,  H04N19/88

    CPC classification number: H04N19/60 ,  H04N19/129 ,  H04N19/13 ,  H04N19/184 ,  H04N19/88

    Abstract: An encoded bitstream is decodable by a processor configured to execute instructions to store, in a first line buffer, first values of a first scan-order diagonal line scanned immediately before a current scan-order diagonal line of a transform block; and store, in a second line buffer, second values of a second scan-order diagonal line scanned immediately before the first scan-order diagonal line. The first values of the first line buffer and the second values of the second line buffer are interleaved in a destination buffer. Using the destination buffer, a probability distribution is selected for coding a current value of the current scan-order diagonal line. The current value is entropy decoded from the bitstream using the probability distribution. One of the second line buffer or the first line buffer is replaced with current values of the current scan-order diagonal line for coding values of an immediately subsequent scan-order diagonal line.

    EFFICIENT CONTEXT MODEL COMPUTATION DESIGN IN TRANSFORM COEFFICIENT CODING
    6.
    发明申请
    EFFICIENT CONTEXT MODEL COMPUTATION DESIGN IN TRANSFORM COEFFICIENT CODING 审中-公开

    公开(公告)号：US20200099956A1

    公开(公告)日：2020-03-26

    申请号：US16693438

    申请日：2019-11-25

    Applicant: GOOGLE LLC

    Inventor： Jingning Han ,  James Zern ,  Linfeng Zhang ,  Ching-Han Chiang ,  Yaowu Xu

    IPC: H04N19/60 ,  H04N19/129 ,  H04N19/13 ,  H04N19/184 ,  H04N19/88

    Abstract: A memory of an apparatus includes instructions executable by a processor to select a backward scan order for traversing, along scan-order anti-diagonal lines, a block of values related to the transform coefficients; select a template for entropy-coding the values, the template indicating, for a to-be-coded value, scan positions of already coded values, the scan positions arranged in at least two template anti-diagonal lines; maintain, for coding first values, where the first values are arranged along a current scan-order anti-diagonal line, a first line buffer and a second line buffer; for a current value of the current scan-order anti-diagonal line, determine a context using the first line buffer and the second line buffer, and entropy encode, in a compressed bitstream, the current value using the context; and replace one of the second line buffer or the first line buffer with the current scan-order anti-diagonal line.

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