公开(公告)号：US20240406383A1

公开(公告)日：2024-12-05

申请号：US18804497

申请日：2024-08-14

Applicant: LG Electronics Inc.

Inventor： Jangwon CHOI ,  Jin HEO ,  Seunghwan KIM ,  Jaehyun LIM ,  Ling LI

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

Abstract: A method for decoding an image by a decoding device according to the present document comprises the steps of receiving prediction-related information of a current block; deriving an intra prediction type of the current block on the basis of the prediction-related information; forming an intra prediction mode candidate list of the current block on the basis of intra prediction modes of blocks neighboring the current block; deriving an intra prediction mode of the current block on the basis of the intra prediction mode candidate list; and deriving reference samples of the current block on the basis of the intra prediction type and the intra prediction mode, and deriving a prediction sample on the basis of the reference samples.

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：US20240323387A1

公开(公告)日：2024-09-26

申请号：US18735704

申请日：2024-06-06

Applicant: LG Electronics Inc.

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

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

CPC classification number: H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46

Abstract: An image decoding method according to the present document comprises the steps of: determining whether or not an effective coefficient is present in a second area not including an upper-left first area of a current block; parsing an MTS index from a bitstream on the basis that the effective coefficient is not present in the second area; and deriving residual samples for the current block by applying a transform kernel, which is derived on the basis of the MTS index, to transform coefficients in the first area, wherein the MTS index can be parsed on the basis that the effective coefficient, which is present in a scan sub-block which is scanned for the effective coefficient, is not present in the second area.

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：US20240267566A1

公开(公告)日：2024-08-08

申请号：US18635952

申请日：2024-04-15

Applicant: LG ELECTRONICS INC.

Inventor： Hendry HENDRY ,  Seethal PALURI ,  Seunghwan KIM

IPC: H04N19/70 ,  H04N19/107 ,  H04N19/119 ,  H04N19/136 ,  H04N19/172 ,  H04N19/174 ,  H04N19/503 ,  H04N19/593

CPC classification number: H04N19/70 ,  H04N19/107 ,  H04N19/119 ,  H04N19/136 ,  H04N19/172 ,  H04N19/174 ,  H04N19/503 ,  H04N19/593

Abstract: A video decoding method performed by a video decoding apparatus according to the present document comprises: parsing number information about the number of slices for which height is explicitly signaled in a tile of a current picture from a bitstream; parsing height information about the height of the slices for which height is explicitly signaled from the bitstream based on the number information; and decoding the current picture based on the number information and the height information.

公开(公告)号：US20240244262A1

公开(公告)日：2024-07-18

申请号：US18611214

申请日：2024-03-20

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

CPC classification number: H04N19/619 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

Abstract: A video decoding method according to the present document is characterized by comprising: a step for deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; a step for deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) of the transform coefficients; and a step for generating a reconstructed picture on the basis of residual samples for the target block on the basis of an inverse primary transform of the modified transform coefficients, wherein the inverse RST using a transform kernel matrix is performed on transform coefficients of the upper-left 4×4 region of an 8×8 region of the target block, and the modified transform coefficients of the upper-left 4×4 region, upper-right 4×4 region, and lower-left 4×4 region of the 8×8 region are derived through the inverse RST.

公开(公告)号：US20240205455A1

公开(公告)日：2024-06-20

申请号：US18592113

申请日：2024-02-29

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KIM ,  Jaehyun LIM ,  Seunghwan KIM

IPC: H04N19/593 ,  H04N19/11 ,  H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/196 ,  H04N19/61

CPC classification number: H04N19/593 ,  H04N19/11 ,  H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/197 ,  H04N19/61

Abstract: Embodiments in the present specification provide a video signal processing method and device. A method of processing a video signal according to an embodiment in the present specification comprises the steps of: acquiring an intra-prediction mode for a current block from the video signal; determining a modified intra-prediction mode from the intra-prediction mode for the current block on the basis of the width and height of and the intra-prediction mode for the current block; and applying a transform determined on the basis of the modified intra-prediction mode. The accuracy of prediction can be further improved by deriving a modified intra-prediction mode according to a wide-angle intra-prediction mode according to the shape of and an intra-prediction mode for a current block.

公开(公告)号：US20240205444A1

公开(公告)日：2024-06-20

申请号：US18593762

申请日：2024-03-01

Applicant: LG ELECTRONICS INC.

Inventor： Jungah CHOI ,  Sunmi YOO ,  Jaehyun LIM ,  Jangwon CHOI ,  Seunghwan KIM

IPC: H04N19/46 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

CPC classification number: H04N19/46 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: An image decoding method performed by a decoding device according to the present document is characterized by comprising the steps of: acquiring image information including a Block-based Delta Pulse Code Modulation (BDPCM) available flag; and generating a reconstructed picture on the basis of the image information, wherein the BDPCM available flag relates to whether BDPCM is available for chroma and luma blocks.