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    Video or image coding method and device therefor
    1.
    发明授权
    Video or image coding method and device therefor 有权

    公开(公告)号：US12284392B2

    公开(公告)日：2025-04-22

    申请号：US18605477

    申请日：2024-03-14

    Applicant: LG ELECTRONICS INC.

    Inventor： Seethal Paluri ,  Jie Zhao ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/70 ,  H04N19/117 ,  H04N19/159 ,  H04N19/169 ,  H04N19/176 ,  H04N19/82

    Abstract: According to the disclosure of the present document, an image decoding method performed by a decoding device comprises the steps of: acquiring, through a bitstream, image information including prediction mode information and residual information; deriving a prediction mode of a current block on the basis of the prediction mode information; deriving prediction samples on the basis of the prediction mode; deriving residual samples on the basis of the residual information; generating reconstruction samples on the basis of the prediction samples and the residual samples; deriving filter coefficients for an adaptive loop filter (ALF) procedure for the reconstruction samples; and generating modified reconstruction samples on the basis of the reconstruction samples and the filter coefficients, wherein the image information includes a first adaptation parameter set (APS) including an ALF data field, and the ALF data field includes ALF parameters used to derive the filter coefficients.

    Image coding method based on secondary transform, and device therefor
    2.
    发明授权
    Image coding method based on secondary transform, and device therefor 有权

    公开(公告)号：US12273563B2

    公开(公告)日：2025-04-08

    申请号：US18414206

    申请日：2024-01-16

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

    IPC: H04N19/18 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/60 ,  H04N19/70

    Abstract: An image decoding method comprises the steps of: deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) for the transform coefficients; and generating a restoration picture on the basis of residual samples for the target block, on the basis of an inverse primary transform for the modified transform coefficients, wherein the inverse RST is performed on the basis of: transform sets determined by a mapping relation according to an intra prediction mode applied to the target block; and a transform kernel matrix selected from among two transform kernel matrices included in each of the transform sets, and is performed on the basis of: whether the inverse RST is applied; and a transform index for indicating any one of the transform kernel matrices included in the transform sets.

    Intra-prediction method, and encoder and decoder using same
    3.
    发明授权
    Intra-prediction method, and encoder and decoder using same 有权

    公开(公告)号：US12273559B2

    公开(公告)日：2025-04-08

    申请号：US18407955

    申请日：2024-01-09

    Applicant: LG ELECTRONICS INC.

    Inventor： Joonyoung Park ,  Seungwook Park ,  Jaehyun Lim ,  Jungsun Kim ,  Younghee Choi ,  Byeongmoon Jeon ,  Yongjoon Jeon

    IPC: H04N19/176 ,  H04N19/105 ,  H04N19/11 ,  H04N19/117 ,  H04N19/593

    Abstract: The present invention relates to an intra-prediction method and to an encoder and decoder using same. The intra-prediction method according to one embodiment of the present invention comprises the steps of deriving a prediction mode of a current block; and generating a prediction block with respect to the current block on the basis of the prediction mode of the current block. When the prediction mode of the current block is an intra-angular prediction mode, values of boundary samples from among left boundary samples and upper boundary samples of the prediction block, which are not positioned in a prediction direction of the intra-angular prediction mode, are derived on the basis of reference samples positioned in the prediction direction of the intra-angular prediction mode, and on the basis of adjacent reference samples.

    Transform-based image coding method and device therefor
    6.
    发明授权
    Transform-based image coding method and device therefor 有权

    公开(公告)号：US12244813B2

    公开(公告)日：2025-03-04

    申请号：US18611275

    申请日：2024-03-20

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/96

    Abstract: An image decoding method according to the present document can comprise the steps of: acquiring, from a bitstream, intra prediction mode information and an LFNST index; deriving, as a cross-component linear model (CCLM) mode, an intra prediction mode of a chroma block on the basis of the intra prediction mode information; changing the intra prediction mode of the chroma block from the CCLM mode to an intra prediction mode of a luma block corresponding to the chroma block; determining an LFNST set, including LFNST matrices, on the basis of the intra prediction mode of the luma block; selecting one of the LFNST matrices on the basis of the LFNST set and the LFNST index; and deriving transform coefficients for the chroma block on the basis of the selected LFNST matrix.

    Image coding method and apparatus based on intra prediction using MPM list
    8.
    发明授权
    Image coding method and apparatus based on intra prediction using MPM list 有权

    公开(公告)号：US12177420B2

    公开(公告)日：2024-12-24

    申请号：US18131767

    申请日：2023-04-06

    Applicant: LG Electronics Inc.

    Inventor： Ling Li ,  Jaehyun Lim ,  Jin Heo ,  Jangwon Choi ,  Seunghwan Kim

    IPC: H04N11/02 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

    Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure includes receiving intra prediction information including at least one of most probable mode (MPM) flag information representing whether to derive an intra prediction mode for a current block based on MPM candidates for the current block or planar flag information representing whether to determine the intra prediction mode for the current block as a planar mode, deriving the intra prediction mode for the current block based on the MPM flag information and the planar flag information, deriving a predicted block for the current block based on the intra prediction mode for the current block, and generating a reconstructed picture based on the predicted block.

    Inter-prediction method and apparatus in image coding system
    9.
    发明授权
    Inter-prediction method and apparatus in image coding system 有权

    公开(公告)号：US12160583B2

    公开(公告)日：2024-12-03

    申请号：US18368336

    申请日：2023-09-14

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Jaehyun Lim ,  Seunghwan Kim ,  Jungdong Seo ,  Jaeho Lee ,  Hyeongmoon Jang

    IPC: H04N19/139 ,  H04N19/105 ,  H04N19/109 ,  H04N19/176 ,  H04N19/503

    Abstract: An image decoding method performed by a decoding apparatus includes the operations: deriving a correspondence block corresponding to the current block of the current picture, the correspondence block being located in a co-located picture; deriving a movement vector of the correspondence block; scaling the movement vector of the correspondence block based on a first temporal distance and second temporal distance, the first temporal distance being the difference between the POC values of the co-located picture and POC values of the reference picture of the correspondence block, and the second temporal distance being the difference between the POC values of the co-located picture and POC values of the current picture containing the current block; deriving the movement vector updated based on the scaled movement vector and location of the current block; and deriving a movement vector of the current block based on the updated movement vector.

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