公开(公告)号：US20230142928A1

公开(公告)日：2023-05-11

申请号：US17916459

申请日：2021-04-02

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/60 ,  H04N19/46 ,  H04N19/176

CPC classification number: H04N19/60 ,  H04N19/46 ,  H04N19/176

Abstract: An image decoding method according to the present document may comprise the steps of: receiving, at a general restriction information level, a restriction flag for restricting whether to perform a non-separable inverse transform in a low frequency area of a transform block; receiving, at a sequence parameter set level, an activation flag indicating whether to activate the non-separable inverse transform; parsing a transform index used for the non-separable inverse transform, on the basis of the restriction flag and the activation flag; and performing the non-separable inverse transform on the transform block on the basis of the transform index.

公开(公告)号：US20230134294A1

公开(公告)日：2023-05-04

申请号：US18092828

申请日：2023-01-03

Applicant: LG Electronics Inc.

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

IPC: H04N19/12 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18

Abstract: An image decoding method includes: acquiring a multiple transform selection (MTS) index and residual information from a bitstream; deriving transform coefficients for the current block on the basis of the residual information; and generating residual samples of the current block on the basis of the MTS index and the transform coefficients, wherein the MTS index indicates a transform kernel set to be applied to the current block among transform kernel set candidates, at least one bin among bins of a bin string of the MTS index is derived on the basis of context coding, the context coding is performed on the basis of values of increase and decrease in a context index pertaining to the MTS index, and a single value of increase and decrease in the context index can be used for the context coding of the first bin among the bins of the bin string.

公开(公告)号：US20230091433A1

公开(公告)日：2023-03-23

申请号：US18072395

申请日：2022-11-30

Applicant: LG Electronics Inc.

Inventor： Jaehyun LIM ,  Byeongmoon JEON ,  Seungwook PARK ,  Jaewon SUNG ,  Jungsun KIM ,  Yongjoon JEON ,  Joonyoung PARK ,  Younghee CHOI

IPC: G06V10/20 ,  H04N19/50 ,  H04N19/593 ,  H04N19/11 ,  H04N19/14 ,  H04N19/157 ,  H04N19/182 ,  H04N19/44 ,  H04N19/80 ,  H04N19/82

Abstract: New intra planar modes are introduced for predicting digital video data. As part of the new intra planar modes, various methods are offered for predicting a first sample within a prediction unit, where the first sample is needed for referencing to when processing the new intra planar modes. And once the first sample is successfully predicted, the new intra planar modes are able to predict a sample of video data within the prediction unit by processing a bi-linear interpolation of four previously reconstructed reference samples.

公开(公告)号：US20230078566A1

公开(公告)日：2023-03-16

申请号：US17790001

申请日：2021-01-07

Applicant: LG Electronics Inc.

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

IPC: H04N19/593 ,  H04N19/11 ,  H04N19/176 ,  H04N19/132 ,  H04N19/119 ,  H04N19/136 ,  H04N19/61

Abstract: An image decoding method according to the present document may comprise the steps of: when an ISP mode is applied to a current block, remapping an intra prediction mode of the current block to a wide-angle intra prediction mode on the basis of the width and height of a first block or the width and height of a second block; performing prediction on the current block on the basis of the wide-angle intra prediction mode; and remapping the intra prediction mode of the current block to a wide-angle intra prediction mode on the basis of the width and height of the first block or the width and height of the second block, and determining an LFNST set including LFNST matrices on the basis of the wide-angle intra prediction mode, wherein the first block includes a coding block, and the second block includes a partition block.

公开(公告)号：US20230059802A1

公开(公告)日：2023-02-23

申请号：US17967106

申请日：2022-10-17

Applicant: LG Electronics Inc.

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

IPC: H04N19/124 ,  H04N19/625 ,  H04N19/94 ,  H04N19/39

Abstract: An image decoding method according to the present document comprises a step of generating residual samples of a current block on the basis of residual information, wherein the residual information comprises a multiple transform selection (MTS) index and information regarding transform coefficients, the residual samples are generated from transform coefficients according to the information regarding the transform coefficients by using a transform kernel set, the transform kernel set is determined by the MTS index from among transform kernel set candidates, at least one of bins of a bin string of the MTS index is derived on the basis of context coding, the context coding is performed based on a value of a context index with respect to the MTS index.

公开(公告)号：US20230054265A1

公开(公告)日：2023-02-23

申请号：US17970027

申请日：2022-10-20

Applicant: LG Electronics Inc.

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

IPC: H04N19/60 ,  H04N19/122 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

Abstract: An image decoding method according to the present document comprises the steps of: acquiring prediction-related information and residual-related information for a current block; deriving transform coefficients for the current block on the basis of the residual-related information; and generating residual samples of the current block on the basis of the transform coefficients, wherein the residual-related information includes low-frequency non-separable transform (LFNST) index information indicating information relating to non-separable transform for a low-frequency transform coefficient of the current block on the basis of a matrix-based intra prediction (MIP) flag.

公开(公告)号：US20230007268A1

公开(公告)日：2023-01-05

申请号：US17899834

申请日：2022-08-31

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Jaehyun LIM ,  Junghak NAM

IPC: H04N19/132 ,  H04N19/117 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

Abstract: A method for decoding an image, according to the present document, comprises: receiving a bitstream including BDPCM information; deriving residual samples for a current block on the basis of the BDPCM information; deriving prediction samples for the current block on the basis of the BDPCM information; generating a reconstructed picture on the basis of the residual samples and the prediction samples; and performing deblocking filtering on the reconstructed picture, wherein when BDPCM is applied to the current block, the deblocking filtering is not performed.

公开(公告)号：US20220394278A1

公开(公告)日：2022-12-08

申请号：US17764465

申请日：2020-10-08

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/18 ,  H04N19/70 ,  H04N19/176 ,  H04N19/122 ,  H04N19/14

Abstract: An image decoding method according to the present document may be characterized by including a step for deriving residual samples by applying at least one of an LFNST or MTS to a transform coefficient, wherein whether to parse an LFNST index indicating an LFNST kernel is determined on the basis of whether zeroing-out has been performed on the LFNST, whether to parse an MTS index indicating an MTS kernel is determined on the basis of whether zeroing-out has been performed on the MTS, the MTS index is parsed on the basis of a color index of the current block being a luma component, and the LFNST index is parsed regardless of the color index of the current block.

公开(公告)号：US20220353504A1

公开(公告)日：2022-11-03

申请号：US17762634

申请日：2020-09-23

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM

IPC: H04N19/132 ,  H04N19/60 ,  H04N19/18 ,  H04N19/176

Abstract: An image decoding method according to the present document comprises the steps of: when an ISP is applied to a current block and the width or height of a sub-partition block is less than or equal to 2, applying LFNST to the transform coefficients to derive modified transform coefficients; deriving residual samples for the objective block on the basis of an inverse primary transform for the modified transform coefficients; and generating a reconstructed picture on the basis of the residual samples for the objective block, wherein when the sub-partition block is an N×2 block or a 2×N block, (M×2) or (2×M) number of modified transform coefficients are derived by applying an LFNST matrix to a predetermined number of transform coefficients in an upper left M×2 area or 2×M (M≤N) area of the sub-partition block.

公开(公告)号：US20220353503A1

公开(公告)日：2022-11-03

申请号：US17851953

申请日：2022-06-28

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/13 ,  H04N19/119 ,  H04N19/124 ,  H04N19/176 ,  H04N19/61

Abstract: The present invention discloses a method for encoding/decoding a video signal and an apparatus for the method. More specifically, a method for decoding a video signal comprises generating a residual block of a current block by performing entropy decoding on the video signal; if size of the current block is smaller than a predetermined first size, parsing a transform skip flag which indicates whether a transform skip is applied to the current block; determining whether to parse a primary transform flag which indicates whether a primary transform is applied to the current block; if it is determined to parse the primary transform flag, parsing the primary transform flag; and if the primary transform flag indicates that a primary transform is applied to the current block, generating a primary inverse transformed transform block of the current block by performing a primary inverse transform to the residual block.