公开(公告)号：US20240373011A1

公开(公告)日：2024-11-07

申请号：US18571622

申请日：2022-06-16

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/122 ,  H04N19/11 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/184 ,  H04N19/61

Abstract: An image decoding method according to the present document comprises a step of deriving a corrected transform coefficient by applying low-frequency non-separable transform (LFNST) to a transform coefficient, wherein an LFNST set for applying the LFNST may be derived on the basis of an intra-prediction mode applied to the current block, and an LFNST matrix may be derived on the basis of the size of the current block and the LFNST set, the LFNST matrix derived as a 16×16 dimensional matrix if the width or the height of the current block is 4 and the width and the height are both 4 or greater, and the LFNST matrix derived as a 64×32 dimensional matrix if the width or the height of the current block is 8 and the width and the height are both 8 or greater. Therefore, coding performance capable of being brought by the LFNST can be maximized within the implementation complexity permitted in forthcoming standards.

公开(公告)号：US20240357110A1

公开(公告)日：2024-10-24

申请号：US18571385

申请日：2022-06-16

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/122 ,  H04N19/14 ,  H04N19/176 ,  H04N19/61

CPC classification number: H04N19/122 ,  H04N19/14 ,  H04N19/176 ,  H04N19/61

Abstract: An image decoding method according to this document comprises a step for deriving, for transform coefficients, modified transform coefficients on the basis of inverse secondary transformation, wherein the step for deriving the modified transform coefficients comprises a step for deriving a transform kernel to be applied to the inverse secondary transformation, the transform kernel may be derived as a 16×16 matrix on the basis of horizontal and vertical lengths of a target block being both greater than or equal to 4 and the horizontal or vertical length being 4, and the transform kernel may be derived as a 48×16 matrix on the basis of the horizontal and vertical lengths of the target block being both greater than or equal to 8 and the horizontal or vertical length being 8.

公开(公告)号：US20240275975A1

公开(公告)日：2024-08-15

申请号：US18638960

申请日：2024-04-18

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/132 ,  H04N19/172 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

CPC classification number: H04N19/132 ,  H04N19/172 ,  H04N19/186 ,  H04N19/46 ,  H04N19/70

Abstract: An image decoding method performed by a decoding device according to the present document is characterized by including the steps of acquiring chroma quantization parameter data of at least one chroma quantization parameter (QP) mapping table for chroma components; deriving the chroma QP mapping table on the basis of the chroma quantization parameter data; deriving chroma quantization parameters for the chroma components on the basis of the chroma QP mapping table; deriving residual samples for the chroma components on the basis of the chroma quantization parameters; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US20240275972A1

公开(公告)日：2024-08-15

申请号：US18592116

申请日：2024-02-29

Applicant: LG Electronics Inc.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/132 ,  H04N19/186 ,  H04N19/30 ,  H04N19/46 ,  H04N19/70

CPC classification number: H04N19/132 ,  H04N19/186 ,  H04N19/30 ,  H04N19/46 ,  H04N19/70

Abstract: According to the disclosure of the present document, the index derivation process for the inverse luma mapping and/or the chroma residual scaling may be simplified, and the linear LMCS may be applied. Accordingly, the complexity of the LMCS may be reduced and video/image coding efficiency may be increased.

公开(公告)号：US20240196008A1

公开(公告)日：2024-06-13

申请号：US18286417

申请日：2022-04-11

Applicant: LG Electronics Inc.

Inventor： Jie ZHAO ,  Seunghwan KIM ,  Seethal PALURI

IPC: H04N19/593 ,  H04N19/11 ,  H04N19/115 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/184

CPC classification number: H04N19/593 ,  H04N19/11 ,  H04N19/115 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/184

Abstract: According to one embodiment of the present specification, provided is an image decoding method performed by a decoding device. The method comprises the steps of: acquiring, from a bitstream, image information comprising information related to decoder-side intra mode derivation (DIMD); determining, on the basis of the information related to DIMD, whether DIMD is applied to a current block; deriving DIMD modes for the current block on the basis that DIMD is applied to the current block; and generating a prediction sample for the current block on the basis of the DIMD modes.

公开(公告)号：US20240195970A1

公开(公告)日：2024-06-13

申请号：US18583100

申请日：2024-02-21

Applicant: LG ELECTRONICS INC.

Inventor： Hendry HENDRY ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

CPC classification number: H04N19/124 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: According to the disclosure of the present document, chroma quantization parameter offset-related information may be signaled via a palette coding syntax, and index information about a chroma quantization parameter offset list may be efficiently parsed/signaled on the basis of information about the number of entries within the chroma quantization parameter offset list. Accordingly, bits that need to be signaled for video/image coding can be reduced, and coding efficiency can be improved.

公开(公告)号：US20240155138A1

公开(公告)日：2024-05-09

申请号：US18410371

申请日：2024-01-11

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/186 ,  H04N19/157 ,  H04N19/176 ,  H04N19/46

CPC classification number: H04N19/186 ,  H04N19/157 ,  H04N19/176 ,  H04N19/46

Abstract: According to the disclosure of the present document, by explicitly signaling information relating to a value(s) of a chroma residual scaling factor, accuracy in an LMCS procedure can be increased, and therefore a subjective/objective image quality of a coded image/video can be further improved.

公开(公告)号：US20240146966A1

公开(公告)日：2024-05-02

申请号：US18286648

申请日：2022-04-12

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/61 ,  H04N19/11 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/593

CPC classification number: H04N19/61 ,  H04N19/11 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/593

Abstract: According to the disclosure of the present disclosure: an LFNST set index for a current block may be derived on the basis of an intra prediction mode on the basis of the intra prediction mode for the current block being a WAIP mode, the LFNST set index may be derived as predetermined one value; and on the basis of the intra prediction mode for the current block being an NAIP mode, the LFNST set index may be derived as one of predetermined N values. Accordingly, it is possible to maximize the coding performance that can be brought about by LFNST within the implementation complexity allowed by a next standard.

公开(公告)号：US20240137560A1

公开(公告)日：2024-04-25

申请号：US18278758

申请日：2022-02-24

Applicant: LG Electronics Inc.

Inventor： Seunghwan KIM ,  Seethal PALURI ,  Jie ZHAO

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

CPC classification number: H04N19/593 ,  H04N19/11 ,  H04N19/119 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176

Abstract: According to one embodiment of the present document, a method by which a decoding device decodes an image is provided. The method comprises the steps of: acquiring, from a bitstream, image information including decoder side intra mode derivation (DIMD)-related information; determining whether a DIMD mode is applied to the current block on the basis of the DIMD-related information; deriving an intra prediction mode for the current block on the basis of the determined result; and generating prediction samples for the current block on the basis of the intra prediction mode.

公开(公告)号：US20240129456A1

公开(公告)日：2024-04-18

申请号：US18532578

申请日：2023-12-07

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/105 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/82

CPC classification number: H04N19/105 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/82

Abstract: According to the disclosure of the present document, scaling list data transmitted from an adaptation parameter set (APS) can be signaled through a hierarchical structure. In addition, by setting a limit on the scaling list data transmitted from the APS, it is possible to reduce the amount of data which has to be signaled for video/image coding, and facilitate implementation.