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    IMAGE DECODING METHOD FOR CHROMA COMPONENT AND DEVICE THEREFOR
    84.
    发明申请
    IMAGE DECODING METHOD FOR CHROMA COMPONENT AND DEVICE THEREFOR 有权

    公开(公告)号：US20220103849A1

    公开(公告)日：2022-03-31

    申请号：US17546599

    申请日：2021-12-09

    Applicant: LG Electronics Inc.

    Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

    IPC: H04N19/46 ,  H04N19/70 ,  H04N19/132 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

    Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: deriving a chroma quantization parameter table on the basis of quantization parameter data; deriving a quantization parameter for combined chroma coding on the basis of the chroma quantization parameter table; deriving prediction samples of a current chroma block on the basis of prediction information; deriving transform coefficients of the current chroma block on the basis of residual information; deriving residual samples by dequantizing the transform coefficients on the basis of the quantization parameter; and generating a reconstructed picture on the basis of the prediction samples and the residual samples.

    METHOD AND DEVICE FOR DESIGNING LOW-FREQUENCY NON-SEPARABLE TRANSFORM
    86.
    发明申请
    METHOD AND DEVICE FOR DESIGNING LOW-FREQUENCY NON-SEPARABLE TRANSFORM 有权

    公开(公告)号：US20240373011A1

    公开(公告)日：2024-11-07

    申请号：US18571622

    申请日：2022-06-16

    Applicant: LG Electronics Inc.

    Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM ,  Jie ZHAO

    IPC: H04N19/122 ,  H04N19/11 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/184 ,  H04N19/61

    Abstract: An image decoding method according to the present document comprises a step of deriving a corrected transform coefficient by applying low-frequency non-separable transform (LFNST) to a transform coefficient, wherein an LFNST set for applying the LFNST may be derived on the basis of an intra-prediction mode applied to the current block, and an LFNST matrix may be derived on the basis of the size of the current block and the LFNST set, the LFNST matrix derived as a 16×16 dimensional matrix if the width or the height of the current block is 4 and the width and the height are both 4 or greater, and the LFNST matrix derived as a 64×32 dimensional matrix if the width or the height of the current block is 8 and the width and the height are both 8 or greater. Therefore, coding performance capable of being brought by the LFNST can be maximized within the implementation complexity permitted in forthcoming standards.

    IMAGE CODING METHOD AND APPARATUS THEREFOR
    87.
    发明公开
    IMAGE CODING METHOD AND APPARATUS THEREFOR 审中-公开

    公开(公告)号：US20240357110A1

    公开(公告)日：2024-10-24

    申请号：US18571385

    申请日：2022-06-16

    Applicant: LG Electronics Inc.

    Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM ,  Jie ZHAO

    IPC: H04N19/122 ,  H04N19/14 ,  H04N19/176 ,  H04N19/61

    CPC classification number: H04N19/122 ,  H04N19/14 ,  H04N19/176 ,  H04N19/61

    Abstract: An image decoding method according to this document comprises a step for deriving, for transform coefficients, modified transform coefficients on the basis of inverse secondary transformation, wherein the step for deriving the modified transform coefficients comprises a step for deriving a transform kernel to be applied to the inverse secondary transformation, the transform kernel may be derived as a 16×16 matrix on the basis of horizontal and vertical lengths of a target block being both greater than or equal to 4 and the horizontal or vertical length being 4, and the transform kernel may be derived as a 48×16 matrix on the basis of the horizontal and vertical lengths of the target block being both greater than or equal to 8 and the horizontal or vertical length being 8.

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