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    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR
    303.
    发明申请
    TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR 有权

    公开(公告)号：US20230012486A1

    公开(公告)日：2023-01-19

    申请号：US17894745

    申请日：2022-08-24

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18

    Abstract: An image decoding method, according to the present document, may comprise the steps of: deriving transform coefficients for a current block on the basis of residual information; determining whether a significant coefficient is present in a second region excluding a first region in the top-left end of the current block; parsing a LFNST index from a bitstream if the significant coefficient is not present in the second region; deriving modified transform coefficients by applying a LFNST matrix, derived on the basis of the LFNST index, to transform coefficients of the first region; and deriving residual samples of the current block on the basis of an inverse primary transform of the modified transform coefficients.

    IMAGE CODING METHOD BASED ON CONVERSION, AND DEVICE FOR SAME
    307.
    发明申请
    IMAGE CODING METHOD BASED ON CONVERSION, AND DEVICE FOR SAME 有权

    公开(公告)号：US20220408094A1

    公开(公告)日：2022-12-22

    申请号：US17775683

    申请日：2020-11-09

    Applicant: LG Electronics Inc.

    Inventor： Moonmo KOO ,  Seunghwan KIM ,  Mehdi SALEHIFAR ,  Jaehyun LIM

    IPC: H04N19/132 ,  H04N19/186 ,  H04N19/18 ,  H04N19/176 ,  H04N19/46

    Abstract: An image decoding method according to the present document comprises the steps of: deriving flag information indicating whether valid coefficients are present in a second area excluding a first area of the upper left corner of the current block; parsing an MTS index from a bitstream on the basis of the flag information indicating the absence of valid coefficients in the second area; and deriving residual samples for the current block by applying a conversion kernel derived on the basis of the MTS index to conversion coefficients of the first area, wherein the flag information may be derived by determining, for each scan sub-block in which the valid coefficients are scanned, whether the valid coefficients are present in the second area.

    ENCODING/DECODING METHOD FOR VIDEO SIGNAL AND DEVICE THEREFOR
    309.
    发明申请
    ENCODING/DECODING METHOD FOR VIDEO SIGNAL AND DEVICE THEREFOR 有权

    公开(公告)号：US20220394300A1

    公开(公告)日：2022-12-08

    申请号：US17282120

    申请日：2019-10-01

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

    IPC: H04N19/625 ,  H04N19/129 ,  H04N19/70 ,  H04N19/176

    Abstract: Embodiments of the present invention provide a video signal processing method and device. Particularly, a method for decoding a video signal, may comprise the steps of: checking whether a transfer skip is applied to a current block; obtaining, from a video signal, a transform index for indicating a transform type set applied to the current block when the transform skip is not applied to the current block, wherein the transform type set includes transform types applied to the current block in horizontal and vertical directions; checking whether the transform type set includes DCT2; determining a region to which a primary transform is applied based on a checking result; and performing an inverse transform on the region to which the primary transform is applied in the horizontal and vertical directions using the transform types included in the transform type set.

    Image Decoding Method Using Chroma Quantization Parameter Table, And Device Therefor
    310.
    发明申请
    Image Decoding Method Using Chroma Quantization Parameter Table, And Device Therefor 有权

    公开(公告)号：US20220368917A1

    公开(公告)日：2022-11-17

    申请号：US17623367

    申请日：2020-06-24

    Applicant: LG Electronics Inc.

    Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

    IPC: H04N19/132 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

    Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: obtaining a flag indicating whether one chroma quantization parameter table is applied to chroma components; obtaining chroma quantization parameter data on the basis of the flag; deriving the chroma quantization parameter 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 quantization parameter table; deriving residual samples for the chroma components on the basis of the chroma quantization parameter; and generating a reconstructed picture on the basis of the residual samples.

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