公开(公告)号：US20250071286A1

公开(公告)日：2025-02-27

申请号：US18945021

申请日：2024-11-12

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/96

Abstract: An image decoding method according to the present document comprises the steps of: applying LFNST to transform coefficients to derive modified transform coefficients; deriving residual samples for a target 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, wherein the step of deriving the modified transform coefficients can comprise the steps of parsing an LFNST index on the basis of the current block tree type being a dual tree chroma, and deriving the modified transform coefficients on the basis of the LFNST index and an LFNST matrix.

公开(公告)号：US20250039450A1

公开(公告)日：2025-01-30

申请号：US18899178

申请日：2024-09-27

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Jaehyun KIM ,  Seunghwan KIM

IPC: H04N19/61 ,  H04N19/119 ,  H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46

Abstract: An image decoding method according to the present document comprises the steps of: receiving a quantized transform coefficient for a target block and a transform index for non-separable quadratic transform; deriving transform coefficients by inversely quantizing the quantized transform coefficient; deriving corrected transform coefficients on the basis of a transform kernel matrix in a predetermined transform set indicated by the transform index; and deriving residual samples for the target block on the basis of inverse linear transform for the corrected transform coefficients, wherein when the target block is divided into a predetermined number of sub-blocks and is coded by intra prediction, the corrected transform coefficients are derived in units of the sub-blocks, and the transform index is received for the target block.

公开(公告)号：US20240414374A1

公开(公告)日：2024-12-12

申请号：US18703597

申请日：2022-10-20

Applicant: LG Electronics Inc.

Inventor： Jungah CHOI ,  Seunghwan KIM ,  Moonmo KOO ,  Jie ZHAO ,  Jaehyun LIM ,  Jangwon CHOI

IPC: H04N19/60 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

Abstract: According to the disclosure of the present document, by configuring a primary transform to include a non-separable transform, higher encoding efficiency may be expected compared to the existing primary transform including only a separable transform. Also, by efficiently signaling information related to a primary transform including a separable transform and a non-separable transform, the effect of reducing the number of bits and improving coding performance may be expected. In addition, by efficiently applying a primary transform and a secondary transform, computational complexity and power consumption may be reduced, and latency required for additionally generated transform coefficient processing may be minimized.

公开(公告)号：US20240414357A1

公开(公告)日：2024-12-12

申请号：US18813296

申请日：2024-08-23

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/18 ,  H04N19/176 ,  H04N19/184 ,  H04N19/46 ,  H04N19/60 ,  H04N19/91

Abstract: An image information decoding method performed by means of a decoding device according to the present invention comprises the steps of: decoding a non-separable secondary transform (NSST) index from a bitstream if NSST is applied to a target block; decoding information relating to transform coefficients with respect to the target block from the bitstream on the basis of the decoded NSST index; and deriving the transform coefficients with respect to the target block on the basis of the decoded information relating to the transform coefficients, wherein the NSST index is decoded prior to the information relating to the transform coefficients with respect to the target block.

公开(公告)号：US20240314322A1

公开(公告)日：2024-09-19

申请号：US18278790

申请日：2022-02-21

Applicant: LG Electronics Inc.

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

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

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

Abstract: An image decoding method according to the present document comprises the steps of: deriving corrected transform coefficients on the basis of secondary inverse transformation with respect to transform coefficients; and deriving residual samples for a target block on the basis of primary inverse transformation with respect to the corrected transform coefficients, wherein, on the basis of which the size of the target block is M×N (M≥16, N≥16), L (48

公开(公告)号：US20240244233A1

公开(公告)日：2024-07-18

申请号：US18614112

申请日：2024-03-22

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO

IPC: H04N19/18 ,  H04N19/11 ,  H04N19/122 ,  H04N19/124 ,  H04N19/129 ,  H04N19/159 ,  H04N19/176 ,  H04N19/184 ,  H04N19/593 ,  H04N19/61 ,  H04N19/91

CPC classification number: H04N19/18 ,  H04N19/11 ,  H04N19/122 ,  H04N19/124 ,  H04N19/129 ,  H04N19/159 ,  H04N19/176 ,  H04N19/184 ,  H04N19/593 ,  H04N19/61 ,  H04N19/91

Abstract: An image decoding method according to the present disclosure includes deriving transform coefficients through dequantization based on the quantized transform coefficients for the target block; deriving modified transform coefficients based on an inverse reduced secondary transform (RST) for the transform coefficients; deriving residual samples for the target block based on an inverse primary transform for the modified transform coefficients; and generating a reconstructed samples based on the residual samples, and prediction samples derived based on an intra prediction mode for the target block, wherein the inverse RST is performed based on a transform kernel matrix selected from a transform set including a plurality of transform kernel matrices, the transform set is determined based on a mapping relationship according to the intra prediction mode applied to the target block, and a plurality of intra prediction modes including the intra prediction mode of the target block are mapped to one transform set.

公开(公告)号：US20240214559A1

公开(公告)日：2024-06-27

申请号：US18518829

申请日：2023-11-24

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/11 ,  H04N19/176 ,  H04N19/61 ,  H04N19/70

CPC classification number: H04N19/11 ,  H04N19/176 ,  H04N19/61 ,  H04N19/70

Abstract: Embodiments of the disclosure provide a method and apparatus for processing a video signal. Particularly, a method for decoding a video signal according to an embodiment of the disclosure may include: determining, among predefined secondary transform sets based on intra-prediction modes of a current block, a secondary transform set applied to the current block; obtaining a first syntax element indicating a secondary transform matrix applied to the current block in the determined secondary transform set; deriving a secondary inverse-transformed block by performing a secondary inverse transform on a left top region of the current block by using the secondary transform matrix specified by the first syntax element; and deriving a residual block of the current block by performing a primary inverse transform on the secondary inverse-transformed block using a primary transform matrix of the current block.

公开(公告)号：US20240129476A1

公开(公告)日：2024-04-18

申请号：US18532387

申请日：2023-12-07

Applicant: LG Electronics Inc.

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

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

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18

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：US20240064333A1

公开(公告)日：2024-02-22

申请号：US18383732

申请日：2023-10-25

Applicant: LG Electronics Inc.

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

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

CPC classification number: 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：US20240048702A1

公开(公告)日：2024-02-08

申请号：US17766364

申请日：2020-10-05

Applicant: LG Electronics Inc.

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

IPC: H04N19/122 ,  H04N19/124 ,  H04N19/184 ,  H04N19/176 ,  H04N19/18 ,  H04N19/132 ,  H04N19/136 ,  H04N19/96 ,  H04N19/61

CPC classification number: H04N19/122 ,  H04N19/124 ,  H04N19/184 ,  H04N19/176 ,  H04N19/18 ,  H04N19/132 ,  H04N19/136 ,  H04N19/96 ,  H04N19/61

Abstract: An image decoding method according to the present document can comprise the steps of: deriving a transform coefficient for a current block on the basis of residual information; determining whether an effective coefficient is in a second area that excludes the upper left first area of the current block; parsing an MTS index from a bitstream if the effective coefficient is not in the second area; and deriving a residual sample by applying, to transform coefficients of the first area, an MTS kernel derived on the basis of the MTS index.