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    Transform-based image coding method and device therefor
    1.
    发明授权
    Transform-based image coding method and device therefor 有权

    公开(公告)号：US12301844B2

    公开(公告)日：2025-05-13

    申请号：US18753511

    申请日：2024-06-25

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/186 ,  H04N19/12 ,  H04N19/136 ,  H04N19/176 ,  H04N19/18 ,  H04N19/61

    Abstract: An image decoding method according to the present document comprises the step of deriving modified transform coefficients, wherein the step of deriving the modified transform coefficients comprises the step of parsing an LFNST index on the basis of a variable indicating whether an ISP is applied to a current block or whether an effective coefficient is present in a DC component of the current block, according to the tree type of the current block, wherein the variable may be derived on the basis of an individual transform skip flag value for a color component of the current block.

    Image decoding method for chroma component and apparatus therefor
    2.
    发明授权
    Image decoding method for chroma component and apparatus therefor 有权

    公开(公告)号：US12301822B2

    公开(公告)日：2025-05-13

    申请号：US18637712

    申请日：2024-04-17

    Applicant: LG Electronics Inc.

    Inventor： Seethal Paluri ,  Seunghwan Kim ,  Jie Zhao

    IPC: H04N19/00 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

    Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring image information including chroma quantization parameter data of at least one chroma QP mapping table for chroma components, and prediction information and residual information regarding the chroma components; deriving the chroma QP mapping table on the basis of the chroma quantization parameter data; deriving a chroma quantization parameter for the chroma components on the basis of the chroma QP mapping table; deriving prediction samples for the chroma components on the basis of the prediction information; deriving residual samples on the basis of the residual information and the chroma quantization parameter; and generating a reconstructed picture on the basis of the prediction samples and the residual samples.

    Video or image coding method and device therefor
    3.
    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
    5.
    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.

    Image/video encoding/decoding method and device
    9.
    发明授权
    Image/video encoding/decoding method and device 有权

    公开(公告)号：US12256106B2

    公开(公告)日：2025-03-18

    申请号：US17780812

    申请日：2020-11-26

    Applicant: LG ELECTRONICS INC.

    Inventor： Hendry Hendry ,  Seethal Paluri ,  Seunghwan Kim

    IPC: H04N19/107 ,  H04N19/119 ,  H04N19/124 ,  H04N19/136 ,  H04N19/174 ,  H04N19/70

    Abstract: A video decoding method performed by a video decoding device according to the present document may comprise: parsing, from a bitstream, number information relating to explicitly signaled height for slices in a tile of a current picture; based on the number information, parsing, from the bitstream, height information relating to explicitly signaled height for the slices, deriving heights of 0-th to (n−1)-th slices in the tile based on the height information; deriving the height of the n-th slice in the tile based on the height of the (n−1)-th slice; deriving a height of a last slice in the tile based on a remaining height.

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