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    IMAGE CODING METHOD BASED ON TRANSFORM, AND DEVICE THEREFOR
    83.
    发明申请
    IMAGE CODING METHOD BASED ON TRANSFORM, AND DEVICE THEREFOR 有权

    公开(公告)号：US20220248027A1

    公开(公告)日：2022-08-04

    申请号：US17699411

    申请日：2022-03-21

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM

    IPC: H04N19/132 ,  H04N19/60 ,  H04N19/18 ,  H04N19/176

    Abstract: An image decoding method includes a step of deriving a modified transform coefficient, wherein the step of deriving the modified transform coefficient includes the steps of: deriving a first variable indicating whether the transform coefficient exists in an area excluding a DC location of the current block; parsing an LFNST index based on the derivation result; and deriving the modified transform coefficient based on the LFNST index and an LFNST matrix, and based on the fact that the current block is divided into a plurality of sub-partition blocks, the LFNST index can be parsed without deriving the first variable.

    CCLM PREDICTION-BASED IMAGE DECODING METHOD AND APPARATUS IN IMAGE CODING SYSTEM
    85.
    发明申请
    CCLM PREDICTION-BASED IMAGE DECODING METHOD AND APPARATUS IN IMAGE CODING SYSTEM 有权

    公开(公告)号：US20220150538A1

    公开(公告)日：2022-05-12

    申请号：US17432372

    申请日：2020-02-21

    Applicant: LG ELECTRONICS INC.

    Inventor： Jangwon CHOI ,  Jin HEO ,  Seunghwan KIM ,  Sunmi YOO ,  Jungah CHOI ,  Ling LI

    IPC: H04N19/593 ,  H04N19/196 ,  H04N19/132 ,  H04N19/11 ,  H04N19/186 ,  H04N19/176

    Abstract: An image decoding method executed by a decoding apparatus according to the present document comprises the steps of: deriving an intra prediction mode of the current chroma block by means of cross-component linear model (CCLM) mode; deriving downsampled luma samples on the basis of the current luma block; deriving downsampled neighboring luma samples on the basis of neighboring luma samples of the current luma block; and deriving the CCLM parameter on the basis of the downsampled neighboring luma samples and neighboring chroma samples of the current neighboring chroma block, wherein the number of downsampled neighboring luma samples and number of neighboring chroma samples are equal to the previously set thresh-hold value, and the thresh-hold value is derived on the basis of the width and height of the current chroma block.

    IMAGE CODING METHOD AND DEVICE ON BASIS OF WIDE-ANGLE INTRA PREDICTION AND TRANSFORM
    86.
    发明申请
    IMAGE CODING METHOD AND DEVICE ON BASIS OF WIDE-ANGLE INTRA PREDICTION AND TRANSFORM 有权

    公开(公告)号：US20220150504A1

    公开(公告)日：2022-05-12

    申请号：US17610985

    申请日：2020-05-27

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo KOO ,  Jaehyun LIM ,  Junghak NAM ,  Seunghwan KIM

    IPC: H04N19/132 ,  H04N19/159 ,  H04N19/18 ,  H04N19/176

    Abstract: An image decoding method according to the present document comprises the steps of: obtaining intra prediction mode information and an LFNST index; deriving an intra prediction mode of a current block on the basis of intra prediction mode information; when wide-angle intra prediction is applied to the current block, deriving a modified intra prediction mode by means of intra prediction mode remapping; deciding an LFNST set comprising LFNST matrices on the basis of the modified intra prediction mode; selecting one of the LFNST matrices on the basis of the LFNST set and LFNST index; and deriving transform coefficients for the current block on the basis of the selected LFNST matrix.

    IMAGE CODING METHOD BASED ON TRANSFORM, AND DEVICE FOR SAME
    87.
    发明申请
    IMAGE CODING METHOD BASED ON TRANSFORM, AND DEVICE FOR SAME 有权

    公开(公告)号：US20220141491A1

    公开(公告)日：2022-05-05

    申请号：US17573487

    申请日：2022-01-11

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

    IPC: H04N19/61 ,  H04N19/122 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

    Abstract: An image decoding method according to the present document may include the steps of: deriving the position of the final significant coefficient in the current block and transform coefficients for the current block on the basis of residual information; determining whether the index of a sub-block including the final significant coefficient is 0 and whether the position of the final significant coefficient in the sub-block is greater than 0; determining whether a significant coefficient exists in a second area excluding a first area at the upper left end of the current block; and parsing an LFNST index from a bitstream when the position of the final significant coefficient is determined to be greater than 0 in the sub-block in which the index is 0, and the significant coefficient does not exist in the second area.

    IMAGE DECODING METHOD FOR RESIDUAL CODING AND APPARATUS THEREFOR
    89.
    发明申请
    IMAGE DECODING METHOD FOR RESIDUAL CODING AND APPARATUS THEREFOR 有权

    公开(公告)号：US20220132132A1

    公开(公告)日：2022-04-28

    申请号：US17569346

    申请日：2022-01-05

    Applicant: LG ELECTRONICS INC.

    Inventor： Jungah CHOI ,  Jaehyun LIM ,  Sunmi YOO ,  Jangwon CHOI ,  Seunghwan KIM

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

    Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring image information including prediction mode information and a residual coding flag; deriving a prediction sample of a current block on the basis of the prediction mode information; on the basis of the residual coding flag, determining whether or not a transform skip residual coding syntax structure is available for the current block within a current slice; deriving a residual sample of the current block by parsing syntax elements for the current block on the basis of a result of the determination; and generating a reconstructed picture on the basis of the prediction sample and the residual sample.

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