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    IMAGE CODING METHOD AND APPARATUS THEREFOR
    431.
    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.

    IMAGE ENCODING/DECODING METHOD, METHOD FOR TRANSMITTING BITSTREAM, AND RECORDING MEDIUM STORING BITSTREAM
    433.
    发明公开
    IMAGE ENCODING/DECODING METHOD, METHOD FOR TRANSMITTING BITSTREAM, AND RECORDING MEDIUM STORING BITSTREAM 审中-公开

    公开(公告)号：US20240283936A1

    公开(公告)日：2024-08-22

    申请号：US18569068

    申请日：2022-07-01

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/132 ,  H04N19/136 ,  H04N19/186 ,  H04N19/70

    CPC classification number: H04N19/132 ,  H04N19/136 ,  H04N19/186 ,  H04N19/70

    Abstract: Provided are an image encoding/decoding method, a bitstream transmission method, and a computer-readable recording medium which stores a bitstream. An image decoding method according to the present disclosure may be an image decoding method performed by an image decoding device, the method comprising the steps of: determining whether a cross component sample adaptive offset (CC-SAO) is activated, on the basis of a value of a first syntax element; deriving collocated luma samples and collocated chroma samples corresponding to each other from reconstructed samples on the basis of a chroma format of the reconstructed samples, on the basis of the value of the first syntax element specifying that the CC-SAO is activated; and determining an offset to be applied to the reconstructed samples on the basis of the collocated luma samples and the collocated chroma samples.

    VIDEO CODING METHOD ON BASIS OF SECONDARY TRANSFORM, AND DEVICE FOR SAME
    434.
    发明公开
    VIDEO CODING METHOD ON BASIS OF SECONDARY TRANSFORM, AND DEVICE FOR SAME 审中-公开

    公开(公告)号：US20240244262A1

    公开(公告)日：2024-07-18

    申请号：US18611214

    申请日：2024-03-20

    Applicant: LG Electronics Inc.

    Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

    IPC: H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

    CPC classification number: H04N19/619 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

    Abstract: A video decoding method according to the present document is characterized by comprising: a step for deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; a step for deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) of the transform coefficients; and a step for generating a reconstructed picture on the basis of residual samples for the target block on the basis of an inverse primary transform of the modified transform coefficients, wherein the inverse RST using a transform kernel matrix is performed on transform coefficients of the upper-left 4×4 region of an 8×8 region of the target block, and the modified transform coefficients of the upper-left 4×4 region, upper-right 4×4 region, and lower-left 4×4 region of the 8×8 region are derived through the inverse RST.

    IMAGE CODING METHOD BASED ON SECONDARY TRANSFORM, AND DEVICE THEREFOR
    438.
    发明公开
    IMAGE CODING METHOD BASED ON SECONDARY TRANSFORM, AND DEVICE THEREFOR 审中-公开

    公开(公告)号：US20240171776A1

    公开(公告)日：2024-05-23

    申请号：US18414206

    申请日：2024-01-16

    Applicant: LG Electronics Inc.

    Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM

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

    CPC classification number: H04N19/60 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  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.

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