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    CCLM-based intra-prediction method and device
    182.
    发明授权
    CCLM-based intra-prediction method and device 有权

    公开(公告)号：US11973954B2

    公开(公告)日：2024-04-30

    申请号：US17739468

    申请日：2022-05-09

    Applicant: LG ELECTRONICS INC.

    Inventor： Jangwon Choi ,  Jin Heo ,  Sunmi Yoo ,  Ling Li

    IPC: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/196

    CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/196

    Abstract: A method for decoding a picture based on a cross-component linear model (CCLM) mode includes deriving neighboring luma reference samples of a luma block, deriving down-sampled neighboring luma reference samples, deriving a linear model parameter based on the down-sampled neighboring luma reference samples and the neighboring chroma reference samples, where the neighboring luma reference samples includes top neighboring luma reference samples, and left neighboring luma reference samples, and where when the top boundary of the luma block overlaps with a boundary of a coding tree unit (CTU), the number of the top neighboring luma reference samples used for deriving the down-sampled neighboring luma reference samples among the neighboring luma reference samples is less than that of the left neighboring luma reference samples used for deriving the down-sampled neighboring luma reference samples.

    Method and apparatus for decoding image by using transform according to block size in image coding system
    184.
    发明授权
    Method and apparatus for decoding image by using transform according to block size in image coding system 有权

    公开(公告)号：US11949875B2

    公开(公告)日：2024-04-02

    申请号：US18127192

    申请日：2023-03-28

    Applicant: LG ELECTRONICS INC.

    Inventor： Sunmi Yoo ,  Jangwon Choi ,  Jin Heo

    IPC: H04N19/132 ,  H04N19/122 ,  H04N19/176 ,  H04N19/61

    CPC classification number: H04N19/132 ,  H04N19/122 ,  H04N19/176 ,  H04N19/61

    Abstract: A method for decoding an image by a decoding apparatus according to the present invention comprises the steps of: deriving predicted samples by performing prediction on a current block; determining whether the current block is to be divided, on the basis of a size and a maximum transform size of the current block; when the current block is determined to be divided, dividing the current block into transform blocks; deriving transform coefficients of the transform blocks; deriving residual samples by performing an inverse transform procedure for the transform coefficients; and generating a reconstructed picture on the basis of the residual samples and the predicted samples, wherein, when the size of the current block is larger than the maximum transform size, the current block is determined to be divided.

    Intra prediction-based image coding method using MPM list and apparatus therefor
    185.
    发明授权
    Intra prediction-based image coding method using MPM list and apparatus therefor 有权

    公开(公告)号：US11889063B2

    公开(公告)日：2024-01-30

    申请号：US18109656

    申请日：2023-02-14

    Applicant: LG ELECTRONICS INC.

    Inventor： Jin Heo ,  Seunghwan Kim ,  Ling Li

    IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

    CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

    Abstract: An image decoding method according to the present disclosure comprises deriving a first candidate intra prediction mode based on a first neighboring block of a current block; deriving a second candidate intra prediction mode based on a second neighboring block of the current block; constructing MPM (Most Probable Mode) list of the current block based on the first candidate intra prediction mode and the second candidate intra prediction mode; deriving an intra prediction mode for the current block based on the MPM list; and generating a prediction sample for the current block based on the intra prediction mode, wherein the first neighboring block is a left neighboring block located at the lowermost side among neighboring blocks adjacent to a left boundary of the current block, and wherein the second neighboring block is an upper neighboring block located at the rightmost side among neighboring blocks adjacent to an upper boundary of the current block.

    Image decoding method for residual coding, and device therefor
    186.
    发明授权
    Image decoding method for residual coding, and device therefor 有权

    公开(公告)号：US11882296B2

    公开(公告)日：2024-01-23

    申请号：US17957986

    申请日：2022-09-30

    Applicant: LG Electronics Inc.

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

    IPC: H04N19/18 ,  H04N19/184 ,  H04N19/70

    CPC classification number: H04N19/18 ,  H04N19/184 ,  H04N19/70

    Abstract: An image decoding method carried out by a decoding device, according to the present document, comprises the steps of: acquiring a sign data hiding enable flag; acquiring a transform skip residual coding (TSRC) enable flag on the basis of the sign data hiding enable flag; acquiring residual information for a current block, on the basis of the TSRC enable flag; 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 sign data hiding enable flag is a flag indicating whether sign data hiding is enabled, the TSRC enable flag is a flag indicating whether TSRC is enabled, and the TSRC enable flag is acquired on the basis of the sign data hiding enable flag having a value of zero.

    Image prediction method and apparatus for performing intra prediction
    188.
    发明授权
    Image prediction method and apparatus for performing intra prediction 有权

    公开(公告)号：US11843801B2

    公开(公告)日：2023-12-12

    申请号：US17876402

    申请日：2022-07-28

    Applicant: LG Electronics Inc.

    Inventor： Sunmi Yoo ,  Jin Heo

    IPC: H04N19/593 ,  H04N19/11 ,  H04N19/117 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176

    CPC classification number: H04N19/593 ,  H04N19/11 ,  H04N19/117 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176

    Abstract: An image decoding method according to the present document may comprise the steps of: deriving an intra prediction mode for a current block; deriving reference samples located around the current block; generating a prediction sample for the current block on the basis of the intra prediction mode and the reference samples; and generating residual samples for the current block on the basis of the prediction sample, wherein the step of generating the prediction sample for the current block may comprise the steps of: deriving an interpolation filter, which is to be applied to the reference sample, on the basis of the prediction mode of the current block or the size of the current block; and generating the prediction sample by applying the derived interpolation filter to the reference sample.

    Image decoding method and apparatus relying on intra prediction in image coding system
    189.
    发明授权
    Image decoding method and apparatus relying on intra prediction in image coding system 有权

    公开(公告)号：US11838546B2

    公开(公告)日：2023-12-05

    申请号：US17896512

    申请日：2022-08-26

    Applicant: LG ELECTRONICS INC.

    Inventor： Jin Heo

    IPC: H04N19/132 ,  H04N19/176 ,  H04N19/593 ,  H04N19/59

    CPC classification number: H04N19/593 ,  H04N19/132 ,  H04N19/176 ,  H04N19/59

    Abstract: An image decoding method performed by a decoding apparatus according to the present invention comprises: a step of deriving an intra prediction mode for a current block; a step of deriving upper neighboring samples of a plurality of rows for the current block, and left neighboring samples of a plurality of columns; a step of deriving one row of upper reference samples on the basis of the upper neighboring samples; a step of deriving one column of left reference samples on the basis of the left neighboring samples; and a step of generating a prediction sample for the current block by using at least one of the upper reference samples and the left reference samples in accordance with the intra prediction mode.

    Image coding method and device for carrying out MRL-based intra prediction
    190.
    发明授权
    Image coding method and device for carrying out MRL-based intra prediction 有权

    公开(公告)号：US11716461B2

    公开(公告)日：2023-08-01

    申请号：US17374274

    申请日：2021-07-13

    Applicant: LG Electronics Inc.

    Inventor： Jin Heo ,  Sunmi Yoo ,  Ling Li ,  Jangwon Choi ,  Jungah Choi

    IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176

    CPC classification number: H04N19/105 ,  H04N19/159 ,  H04N19/176

    Abstract: An image decoding method includes: configuring a MPM list including candidate intra prediction modes for a current block; deriving an intra prediction mode of the current block from the MPM list on the basis of MPM index information indicating an intra prediction mode, among the candidate intra prediction modes included in the MPM list, for the current block; generating prediction samples for the current block on the basis of the intra prediction mode; and generating a reconstructed picture for the current block on the basis of the prediction samples, wherein the step for configuring the MPM list comprises, on the basis of the case where the value of reference line index information, representing a reference line used for the intra prediction of the current block, is not zero, deriving a DC mode as one mode among the candidate intra prediction modes, and including same in the MPM list.

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