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    Transform-based image coding method, and apparatus therefor
    252.
    发明授权
    Transform-based image coding method, and apparatus therefor 有权

    公开(公告)号：US12262025B2

    公开(公告)日：2025-03-25

    申请号：US17963449

    申请日：2022-10-11

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim ,  Mehdi Salehifar

    IPC: H04N19/18 ,  H04N19/119 ,  H04N19/129 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/60 ,  H04N19/70 ,  H04N19/96

    Abstract: An image decoding method according to the present document comprises: a residual coding step for parsing residual information received in a residual coding level and arranging transform coefficients for a current block according to a predetermined scanning order; a step for deriving residual samples by applying at least one of LFNST or MTS to the transform coefficients; and a step for generating a reconstructed picture on the basis of the residual samples, wherein the LFNST is performed on the basis of an LFNST index indicating an LFNST kernel, the MTS is performed on the basis of an MTS index indicating an MTS kernel, the LFNST index and the MTS index are signaled in a coding unit level, and the MTS index is signaled immediately after the signaling of the LFNST index.

    Method and apparatus for processing high level syntax in image/video coding system
    253.
    发明授权
    Method and apparatus for processing high level syntax in image/video coding system 有权

    公开(公告)号：US12250412B2

    公开(公告)日：2025-03-11

    申请号：US18509983

    申请日：2023-11-15

    Applicant: LG Electronics Inc.

    Inventor： Hendry Hendry ,  Junghak Nam ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/172 ,  H04N19/176 ,  H04N19/503 ,  H04N19/593 ,  H04N19/70

    Abstract: A video decoding method performed by a video decoding apparatus, according to the present document, comprises the steps of: acquiring general constraint information from a bitstream; parsing, from the bitstream, a flag indicating whether or not the general constraint information includes information about constraints to which output layer sets conform; parsing the information about the constraints in the general constraint information on the basis of the flag; and decoding a current picture on the basis of the information about the constraints, wherein the general constraint information includes number information and alignment information about the constraints, and, within the general constraint information, the alignment information may be present after the number information.

    Image encoding/decoding method and device therefor
    254.
    发明授权
    Image encoding/decoding method and device therefor 有权

    公开(公告)号：US12250393B2

    公开(公告)日：2025-03-11

    申请号：US18386135

    申请日：2023-11-01

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/44 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/625 ,  H04N19/70

    Abstract: The present invention relates to a video signal decoding method based on a Multiple Transform Selection (MTS). The method may comprise the steps of: parsing a first syntax element representing whether MTS applies to the inverse transformation of a current block, wherein the MTS represents a transform mode which uses a transform type other than a default transform type predefined for the current block; by performing inverse quantization on the current block, deriving an inverse-quantized transform coefficient array having the width and the height of the current block; determining, on the basis of the first syntax element, a vertical transform type applying to the vertical direction of the current block, and a horizontal transform type applying to the horizontal direction of the current block; and, by performing inverse transformation on the inverse-quantized transform coefficient array by using the vertical transform type and the horizontal transform type, deriving a residual sample array having the width and the height of the current block.

    Image decoding method for residual coding based on transform-skip-related flag in image coding system, and apparatus therefor
    255.
    发明授权
    Image decoding method for residual coding based on transform-skip-related flag in image coding system, and apparatus therefor 有权

    公开(公告)号：US12238287B2

    公开(公告)日：2025-02-25

    申请号：US18375004

    申请日：2023-09-29

    Applicant: LG Electronics Inc.

    Inventor： Jungah Choi ,  Sunmi Yoo ,  Jin Heo ,  Jangwon Choi ,  Seunghwan Kim

    IPC: H04N11/02 ,  H04N19/12 ,  H04N19/124 ,  H04N19/167 ,  H04N19/176 ,  H04N19/70

    Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: obtaining a dependent quantization available flag; obtaining a TSRC available flag, on the basis of the dependent quantization available flag; determining a residual coding syntax for a current block, on the basis of the TSRC available flag; obtaining residual information of the determined residual coding syntax for the current block; deriving a residual sample of the current block, on the basis of the residual information; and generating a reconstructed picture, on the basis of the residual sample, wherein the dependent quantization available flag is a flag regarding whether dependent quantization is available, the TSRC available flag is a flag regarding whether TSRC is available, and the TSRC available flag is obtained on the basis of the dependent quantization available flag having a value of 0.

    Image decoding method and device therefor
    259.
    发明授权
    Image decoding method and device therefor 有权

    公开(公告)号：US12212766B2

    公开(公告)日：2025-01-28

    申请号：US17925983

    申请日：2021-05-04

    Applicant: LG Electronics Inc.

    Inventor： Hendry Hendry ,  Seunghwan Kim ,  Seethal Paluri

    IPC: H04N19/423 ,  H04N19/172 ,  H04N19/46 ,  H04N19/70

    Abstract: An image decoding method performed by a decoding device according to the present document comprises the steps of: deriving a value of a variable on the basis of whether a current picture is a first picture of a current access unit (AU) that is a coded video sequence start access unit (CVSS) AU instead of AU 0, wherein the variable indicates whether all picture storage buffers within a decoded picture buffer (DPB) are emptied without being output; updating the DPB on the basis of the variable; and decoding the current picture on the basis of the updated DPB.

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