公开(公告)号：US20220159294A1

公开(公告)日：2022-05-19

申请号：US17424322

申请日：2020-06-17

Applicant: LG Electronics Inc.

Inventor： Sunmi YOO ,  Junghak NAM ,  Jungah CHOI

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/132 ,  H04N19/11 ,  H04N19/70 ,  H04N19/136

Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring image information including a block-based delta pulse code modulation (BDPCM) constraint flag indicating whether or not BDPCM is constrained with respect to an image; acquiring BDPCM-associated information regarding a current block on the basis of the BDPCM constraint flag; and generating reconstructed samples for the current block on the basis of the BDPCM-associated information.

公开(公告)号：US20220150472A1

公开(公告)日：2022-05-12

申请号：US17550847

申请日：2021-12-14

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

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

Abstract: According to the disclosure of the present document, when the inter-prediction type of the current block indicates biprediction, weight index information for a candidate in a merge candidate list or sub-block merge candidate list can be derived, and coding efficiency can be raised.

公开(公告)号：US20220116652A1

公开(公告)日：2022-04-14

申请号：US17559964

申请日：2021-12-22

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/52 ,  H04N19/107 ,  H04N19/105 ,  H04N19/139 ,  H04N19/132 ,  H04N19/176 ,  H04N19/172 ,  H04N19/573

Abstract: An image decoding method according to the present document may comprise the steps of: deriving an inter prediction mode from encoded information; configuring reference picture lists, deriving motion information comprising reference picture indexes for symmetric motion vector differences (SMVD); and generating prediction samples on the basis of the motion information, wherein the reference picture indexes for SMVD can be derived on the basis of short-term reference pictures included within the reference picture lists.

公开(公告)号：US20220086448A1

公开(公告)日：2022-03-17

申请号：US17535090

申请日：2021-11-24

Applicant: LG Electronics Inc.

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

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/18 ,  H04N19/176

Abstract: An image decoding method, according to the present document, may comprise the steps of: deriving transform coefficients for a current block on the basis of residual information; determining whether a significant coefficient is present in a second region excluding a first region in the top-left end of the current block; parsing a LFNST index from a bitstream if the significant coefficient is not present in the second region; deriving modified transform coefficients by applying a LFNST matrix, derived on the basis of the LFNST index, to transform coefficients of the first region; and deriving residual samples of the current block on the basis of an inverse primary transform of the modified transform coefficients.

公开(公告)号：US20220070440A1

公开(公告)日：2022-03-03

申请号：US17416913

申请日：2020-01-02

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/105 ,  H04N19/137 ,  H04N19/132 ,  H04N19/46 ,  H04N19/176

Abstract: A method for decoding an image by a decoding apparatus according to the present document comprises the steps of: obtaining merge with motion vector difference (MMVD) flag information of a current block from a bit stream; determining whether or not the current block is a current picture referencing (CPR) coding block; if the current block is a CPR coding block, deriving base motion information; deriving motion information of the current block on the basis of the base motion information; generating prediction samples of the current block on the basis of the motion information; and generating reconstruction samples of the current block on the basis of the prediction samples, wherein the MMVD flag information indicates whether or not motion information is derived when the MMVD is applied to the current block, and the CPR coding block is a block coded by using a current picture including the current block as a reference picture.

公开(公告)号：US20220060689A1

公开(公告)日：2022-02-24

申请号：US17414893

申请日：2020-01-02

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/513 ,  H04N19/159 ,  H04N19/132

Abstract: A method by which a decoding device performs image decoding, according to the present document, comprises the steps of: deriving a reference block on the basis of a motion shift; determining whether a subblock temporal motion vector predictor (sbTMVP) candidate is available, on the basis of whether the reference block is a current picture referencing (CPR) block; deriving motion information about a current block on the basis of the sbTMVP candidate when the sbTMVP candidate is available; generating prediction samples on the basis of the motion information; and generating a restored picture on the basis of the prediction samples, wherein the sbTMVP candidate is determined to be unavailable with respect to the reference block which is the CPR block.

公开(公告)号：US20220038744A1

公开(公告)日：2022-02-03

申请号：US17503788

申请日：2021-10-18

Applicant: LG ELECTRONICS INC.

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

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

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：US20220038698A1

公开(公告)日：2022-02-03

申请号：US17501885

申请日：2021-10-14

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/46 ,  H04N19/18 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method according to the present document comprises the steps of: deriving a quantized transform coefficient for a current block on the basis of BDPCM; deriving a transform coefficient by performing dequantization on the quantized transform coefficient; and deriving a residual sample on the basis of the transform coefficient, wherein, when the BDPCM is applied to the current block, inverse non-separable transform is not applied to the transform coefficient.

公开(公告)号：US20210337209A1

公开(公告)日：2021-10-28

申请号：US17366722

申请日：2021-07-02

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/139 ,  H04N19/105 ,  H04N19/46 ,  H04N19/176

Abstract: A method for decoding an image by a decoding apparatus according to the present document comprises the steps of: receiving a bit stream including prediction information of a current block; configuring a merge candidate list with respect to the current block; deriving motion information of the current block on the basis of a merge candidate indicated by a candidate flag of the current block in the merge candidate list; deriving an MVD of the current block on the basis of MVD information of the current block and whether or not integer sample precision or fractional sample precision is used in the motion information; deriving modified motion information of the current block on the basis of the motion information and the MVD; and performing prediction of the current block on the basis of the modified motion information, wherein the prediction information includes the candidate flag and the MVD information.

公开(公告)号：US20210321141A1

公开(公告)日：2021-10-14

申请号：US17356016

申请日：2021-06-23

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/176 ,  H04N19/85

Abstract: A method by which a decoding device decodes an image, according to the present document, comprises the steps of: generating a restoration picture on the basis of prediction samples of a coding block; deriving a boundary strength (BS) for a boundary of the coding block in the restoration picture; performing deblocking filtering on the boundary of the coding block on the basis of the boundary strength; and deriving a modified restoration picture for the restoration picture on the basis of the deblocking filtering, wherein the boundary strength is derived on the basis of a prediction mode of a first block and a second block that are adjacent to the boundary of the coding block, and the prediction mode of the first block or the second block is derived on the basis of whether the prediction mode of the first block or the second block is a current picture referencing (CPR) mode to be coded in reference to a current picture.