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    Inter-prediction method and apparatus in image coding system
    242.
    发明授权
    Inter-prediction method and apparatus in image coding system 有权

    公开(公告)号：US11800114B2

    公开(公告)日：2023-10-24

    申请号：US17843531

    申请日：2022-06-17

    Applicant: LG Electronics Inc.

    Inventor： Naeri Park ,  Junghak Nam ,  Jaehyun Lim ,  Seunghwan Kim ,  Jungdong Seo ,  Jaeho Lee ,  Hyeongmoon Jang

    IPC: H04N19/139 ,  H04N19/105 ,  H04N19/109 ,  H04N19/176 ,  H04N19/503

    CPC classification number: H04N19/139 ,  H04N19/105 ,  H04N19/109 ,  H04N19/176 ,  H04N19/503

    Abstract: An image decoding method performed by a decoding apparatus includes the operations of: deriving a correspondence block corresponding to the current block of the current picture, the correspondence block being located in a co-located picture; deriving a movement vector of the correspondence block; scaling the movement vector of the correspondence block based on a first temporal distance and second temporal distance, the first temporal distance being the difference between the POC values of the co-located picture and POC values of the reference picture of the correspondence block, and the second temporal distance being the difference between the POC values of the co-located picture and POC values of the current picture containing the current block; deriving the movement vector updated based on the scaled movement vector and location of the current block; and deriving a movement vector of the current block based on the updated movement vector.

    Encoding/decoding method for video signal and device therefor
    244.
    发明授权
    Encoding/decoding method for video signal and device therefor 有权

    公开(公告)号：US11770560B2

    公开(公告)日：2023-09-26

    申请号：US18094047

    申请日：2023-01-06

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/00 ,  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.

    Methods and apparatuses for processing video signal
    249.
    发明授权
    Methods and apparatuses for processing video signal 有权

    公开(公告)号：US11689744B2

    公开(公告)日：2023-06-27

    申请号：US17258973

    申请日：2019-07-08

    Applicant: LG ELECTRONICS INC.

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

    IPC: H04N11/02 ,  H04N19/61 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/91

    CPC classification number: H04N19/61 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/91

    Abstract: Embodiments of the present invention provide video signal processing methods. A video signal encoding method according to an embodiment of the present invention comprises checking a transform block including residual samples except a prediction sample from a picture of the video signal, generating transform coefficients through a transform for the residual samples of the transform block based on a size of the transform block, and performing quantization and entropy coding the transform coefficients, wherein generating the transform coefficients includes, applying a forward primary transform to each of a horizontal direction and vertical direction of the transform block including the residual samples, and not applying a forward non-separable secondary transform to the transform block to which the primary transform has been applied when the size of the transform block is smaller than or equal to 4×4, and applying the forward non-separable secondary transform to the transform block when the size of the transform block is greater than 4×4.

    Method for encoding/decoding video signals and device therefor
    250.
    发明授权
    Method for encoding/decoding video signals and device therefor 有权

    公开(公告)号：US11683511B2

    公开(公告)日：2023-06-20

    申请号：US17232719

    申请日：2021-04-16

    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.

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