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    IMAGE CODING METHOD ON BASIS OF SECONDARY TRANSFORM AND DEVICE THEREFOR
    2.
    发明申请
    IMAGE CODING METHOD ON BASIS OF SECONDARY TRANSFORM AND DEVICE THEREFOR 有权

    公开(公告)号：US20240414357A1

    公开(公告)日：2024-12-12

    申请号：US18813296

    申请日：2024-08-23

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/18 ,  H04N19/176 ,  H04N19/184 ,  H04N19/46 ,  H04N19/60 ,  H04N19/91

    Abstract: An image information decoding method performed by means of a decoding device according to the present invention comprises the steps of: decoding a non-separable secondary transform (NSST) index from a bitstream if NSST is applied to a target block; decoding information relating to transform coefficients with respect to the target block from the bitstream on the basis of the decoded NSST index; and deriving the transform coefficients with respect to the target block on the basis of the decoded information relating to the transform coefficients, wherein the NSST index is decoded prior to the information relating to the transform coefficients with respect to the target block.

    METHOD FOR ENCODING/DECODING VIDEO SIGNAL, AND APPARATUS THEREFOR
    3.
    发明公开
    METHOD FOR ENCODING/DECODING VIDEO SIGNAL, AND APPARATUS THEREFOR 审中-公开

    公开(公告)号：US20240214559A1

    公开(公告)日：2024-06-27

    申请号：US18518829

    申请日：2023-11-24

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N19/11 ,  H04N19/176 ,  H04N19/61 ,  H04N19/70

    CPC classification number: H04N19/11 ,  H04N19/176 ,  H04N19/61 ,  H04N19/70

    Abstract: Embodiments of the disclosure provide a method and apparatus for processing a video signal. Particularly, a method for decoding a video signal according to an embodiment of the disclosure may include: determining, among predefined secondary transform sets based on intra-prediction modes of a current block, a secondary transform set applied to the current block; obtaining a first syntax element indicating a secondary transform matrix applied to the current block in the determined secondary transform set; deriving a secondary inverse-transformed block by performing a secondary inverse transform on a left top region of the current block by using the secondary transform matrix specified by the first syntax element; and deriving a residual block of the current block by performing a primary inverse transform on the secondary inverse-transformed block using a primary transform matrix of the current block.

    ENCODING/DECODING METHOD FOR VIDEO SIGNAL AND DEVICE THEREFOR
    5.
    发明公开
    ENCODING/DECODING METHOD FOR VIDEO SIGNAL AND DEVICE THEREFOR 审中-公开

    公开(公告)号：US20230388547A1

    公开(公告)日：2023-11-30

    申请号：US18231662

    申请日：2023-08-08

    Applicant: LG Electronics Inc.

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

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

    CPC classification number: H04N19/625 ,  H04N19/129 ,  H04N19/176 ,  H04N19/70

    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.

    METHOD FOR ENCODING/DECODING VIDEO SIGNALS AND DEVICE THEREFOR
    7.
    发明公开
    METHOD FOR ENCODING/DECODING VIDEO SIGNALS AND DEVICE THEREFOR 审中-公开

    公开(公告)号：US20230308670A1

    公开(公告)日：2023-09-28

    申请号：US18143950

    申请日：2023-05-05

    Applicant: LG ELECTRONICS INC.

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

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

    CPC classification number: H04N19/44 ,  H04N19/159 ,  H04N19/176 ,  H04N19/625 ,  H04N19/70

    Abstract: A method and a device for processing a video signal are disclosed. In particular, a method for decoding a video signal includes parsing a first syntax element indicating a primary transform kernel applied to a primary transform of a current block; determining whether a secondary transform is applicable to the current block based on the first syntax element; if the secondary transform is applicable to the current block, parsing a second syntax element indicating a secondary transform kernel applied to a secondary transform of the current block; deriving a secondary inverse-transformed block, by performing a secondary inverse-transform for a top-left specific region of the current block using a secondary transform kernel indicated by the second syntax element; and deriving a residual block of the current block, by performing a primary inverse-transform for the secondary inverse-transformed block using a primary transform kernel indicated by the first syntax element.

    METHOD AND APPARATUS FOR PROCESSING IMAGE SIGNAL
    8.
    发明公开
    METHOD AND APPARATUS FOR PROCESSING IMAGE SIGNAL 审中-公开

    公开(公告)号：US20230164319A1

    公开(公告)日：2023-05-25

    申请号：US18097775

    申请日：2023-01-17

    Applicant: LG ELECTRONICS INC

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

    IPC: H04N19/122 ,  H04N19/167 ,  H04N19/176 ,  H04N19/61

    CPC classification number: H04N19/122 ,  H04N19/167 ,  H04N19/176 ,  H04N19/61

    Abstract: The embodiments of the present disclosure provides a method and apparatus for video signal processing. A method for decoding an image signal according to an embodiment of the present disclosure may include determining an input length and an output length of a non-separable transform based on a height and a width of a current block; determining a non-separable transform matrix corresponding to the input length and the output length of a non-separable transform; and applying the non-separable transform matrix to coefficients by a number of the input length in the current block, wherein the height and the width of a current block is greater than or equal to 8, wherein, if each of the height and the width of a current block is equal to 8, the input length of the non-separable transform is determined as 8.

    IMAGE CODING METHOD ON BASIS OF TRANSFORMATION AND DEVICE THEREFOR
    9.
    发明公开
    IMAGE CODING METHOD ON BASIS OF TRANSFORMATION AND DEVICE THEREFOR 审中-公开

    公开(公告)号：US20230156223A1

    公开(公告)日：2023-05-18

    申请号：US18097625

    申请日：2023-01-17

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/60 ,  H04N19/105 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

    CPC classification number: H04N19/60 ,  H04N19/105 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

    Abstract: An image decoding method performed by means of a decoding device according to the present invention comprises the steps of: deriving quantized transform coefficients with respect to a target block from a bitstream; performing inverse quantization with respect to the quantized transform coefficients with respect to the target block and deriving transform coefficients; deriving residual samples with respect to the target block on the basis of reduced inverse transform with respect to the transform coefficients; and generating a reconstructed picture on the basis of the residual samples with respect to the target block and prediction samples with respect to the target block. The reduced inverse transform is performed on the basis of a reduced inverse transform matrix. The reduced inverse transform matrix is a non-square matrix of which the number of columns is smaller than the number of rows.

    VIDEO CODING METHOD ON BASIS OF SECONDARY TRANSFORM, AND DEVICE THEREFOR
    10.
    发明申请
    VIDEO CODING METHOD ON BASIS OF SECONDARY TRANSFORM, AND DEVICE THEREFOR 有权

    公开(公告)号：US20230053262A1

    公开(公告)日：2023-02-16

    申请号：US17962077

    申请日：2022-10-07

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

    Abstract: A video transform method includes: receiving a quantized transform coefficient for a target block and a transform index for a non-separated secondary transform; inverse-quantizing the quantized transform coefficient; deriving an input transform coefficient size indicating the length of the inverse-quantized transform coefficient to which the non-separated secondary transform has been applied, an output transform coefficient size indicating the length of a modified transform coefficient to which the non-separated secondary transform has been applied, and a transform set mapped to the intra mode of the target block, when the transform index does not indicate that the non-separated secondary transform is not performed; and deriving the modified transform coefficient on the basis of a matrix operation on a transform kernel matrix in the transform set indicated by the transform index, and a transform coefficient list corresponding to the input transform coefficient size.

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