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    Inter prediction method and device in video coding system
    41.
    发明授权
    Inter prediction method and device in video coding system 有权

    公开(公告)号：US10728571B2

    公开(公告)日：2020-07-28

    申请号：US15750093

    申请日：2016-07-15

    Applicant: LG Electronics Inc.

    Inventor： Eunyong Son ,  Moonmo Koo ,  Hyeongmoon Jang ,  Seungwook Park ,  Yongjoon Jeon

    IPC: H04N19/513 ,  H04N19/176 ,  H04N19/105 ,  H04N19/517 ,  H04N19/503 ,  H04N19/182 ,  H04N19/159 ,  H04N19/44

    Abstract: A video decoding method performed by a decoding device includes: deriving control points (CPs) for a current block; acquiring motion vectors for the CPs; deriving a sample-unit motion vector in the current block based on the acquired motion vectors; deriving a prediction sample for the current block based on the sample-unit motion vector; and generating a restoration sample based on the prediction sample, wherein coordinates of a bottom-right sample position of the current block are (0, 0), and coordinates of CPO among the CPs are (0, 0). Inter prediction is effectively performed through sample-unit motion vectors even when an image in a current block is planarly moved and variously changed, and since motion vectors for CPs are derived based on already-decoded neighboring blocks, an amount of information for the motion vectors for the CPs and for a residual signal for the current block is reduced, improving overall coding efficiency.

    Method and device for chroma sample intra prediction in video coding system
    42.
    发明授权
    Method and device for chroma sample intra prediction in video coding system 有权

    公开(公告)号：US10602138B2

    公开(公告)日：2020-03-24

    申请号：US15755037

    申请日：2016-08-25

    Applicant: LG ELECTRONICS INC.

    Inventor： Eunyong Son ,  Jin Heo ,  Seungwook Park ,  Yongjoon Jeon ,  Moonmo Koo

    IPC: H04N19/11 ,  H04N19/186 ,  H04N19/159 ,  H04N19/176 ,  H04N19/593

    Abstract: An intra prediction method according to the present invention comprises the steps of: acquiring information on a luma prediction mode of a current block and information on a chroma prediction mode of the current block from a bit stream; deriving a luma intra prediction mode of the current block on the basis of the information on the luma prediction mode; determining a chroma intra prediction mode of the current block on the basis of information on the luma intra prediction mode and the information on the chroma prediction mode; and generating a chroma prediction sample of the current block on the basis of the chroma intra prediction mode. According to the present invention, it is possible to reflect the difference between the ratio of the width to the height of a luma component and the ratio of the width to the height of a chroma component, and thus to more accurately perform intra prediction in units of samples and improve intra prediction performance.

    Method and apparatus for encoding and decoding video signal
    43.
    发明授权
    Method and apparatus for encoding and decoding video signal 有权

    公开(公告)号：US10587873B2

    公开(公告)日：2020-03-10

    申请号：US15768326

    申请日：2016-10-13

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Sehoon Yea ,  Kyuwoon Kim ,  Bumshik Lee

    IPC: H04N19/11 ,  H04N19/147 ,  H04N19/593 ,  H04N19/176

    Abstract: The present invention provides a method for processing a video signal, comprising generating a prediction block for a neighbor block using a reconstructed reference pixel of the neighbor block when the neighbor block adjacent to a current block is intra-coded; determining a refined intra prediction mode of the neighbor block based on the prediction block, where the refined intra prediction mode represents a mode which minimizes an error between the prediction block and a reconstructed neighbor block; generating a prediction mode candidate list for the current block based on the refined intra prediction mode; selecting an intra prediction mode for the current block from the prediction mode candidate list; and performing a prediction for the current block based on the intra prediction mode.

    Transform-based image coding method and device therefor
    47.
    发明授权
    Transform-based image coding method and device therefor 有权

    公开(公告)号：US12301844B2

    公开(公告)日：2025-05-13

    申请号：US18753511

    申请日：2024-06-25

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/186 ,  H04N19/12 ,  H04N19/136 ,  H04N19/176 ,  H04N19/18 ,  H04N19/61

    Abstract: An image decoding method according to the present document comprises the step of deriving modified transform coefficients, wherein the step of deriving the modified transform coefficients comprises the step of parsing an LFNST index on the basis of a variable indicating whether an ISP is applied to a current block or whether an effective coefficient is present in a DC component of the current block, according to the tree type of the current block, wherein the variable may be derived on the basis of an individual transform skip flag value for a color component of the current block.

    Image coding method based on secondary transform, and device therefor
    48.
    发明授权
    Image coding method based on secondary transform, and device therefor 有权

    公开(公告)号：US12273563B2

    公开(公告)日：2025-04-08

    申请号：US18414206

    申请日：2024-01-16

    Applicant: LG Electronics Inc.

    Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

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

    Transform-based image coding method and device therefor
    50.
    发明授权
    Transform-based image coding method and device therefor 有权

    公开(公告)号：US12244813B2

    公开(公告)日：2025-03-04

    申请号：US18611275

    申请日：2024-03-20

    Applicant: LG ELECTRONICS INC.

    Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

    IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/96

    Abstract: An image decoding method according to the present document can comprise the steps of: acquiring, from a bitstream, intra prediction mode information and an LFNST index; deriving, as a cross-component linear model (CCLM) mode, an intra prediction mode of a chroma block on the basis of the intra prediction mode information; changing the intra prediction mode of the chroma block from the CCLM mode to an intra prediction mode of a luma block corresponding to the chroma block; determining an LFNST set, including LFNST matrices, on the basis of the intra prediction mode of the luma block; selecting one of the LFNST matrices on the basis of the LFNST set and the LFNST index; and deriving transform coefficients for the chroma block on the basis of the selected LFNST matrix.

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