公开(公告)号：US12137216B2

公开(公告)日：2024-11-05

申请号：US18519996

申请日：2023-11-27

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

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

Abstract: Embodiments of the present invention provide a method and apparatus for processing a video signal. A method for decoding an image signal according to an embodiment of the present invention comprises the steps of: for a current block having a width and a height different from each other, determining a modified intra prediction mode from an intra prediction mode, on the basis of a ratio between the width and the height of the current block and the intra prediction mode; determining an inverse non-separable transform set on the basis of the modified intra prediction mode; and applying an inverse non-separable transform matrix selected from the inverse non-separable transform set with respect to the top-left region of the current block, which is determined according to the width and the height of the current block.

公开(公告)号：US12108078B2

公开(公告)日：2024-10-01

申请号：US17790001

申请日：2021-01-07

Applicant: LG Electronics Inc.

Inventor： Moonmo Koo ,  Seunghwan Kim ,  Mehdi Salehifar ,  Jaehyun Lim

IPC: H04N19/11 ,  H04N19/119 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/593 ,  H04N19/61 ,  H04N19/70

CPC classification number: H04N19/593 ,  H04N19/11 ,  H04N19/119 ,  H04N19/132 ,  H04N19/136 ,  H04N19/176 ,  H04N19/61 ,  H04N19/70

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：US12095992B2

公开(公告)日：2024-09-17

申请号：US17766364

申请日：2020-10-05

Applicant: LG Electronics Inc.

Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim ,  Mehdi Salehifar

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

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

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.

公开(公告)号：US20240305794A1

公开(公告)日：2024-09-12

申请号：US18662814

申请日：2024-05-13

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim ,  Mehdi Salehifar

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

CPC classification number: H04N19/18 ,  H04N19/122 ,  H04N19/14 ,  H04N19/176 ,  H04N19/70

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：US12063366B2

公开(公告)日：2024-08-13

申请号：US17637516

申请日：2020-09-15

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Seunghwan Kim ,  Mehdi Salehifar ,  Jaehyun Lim

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

CPC classification number: H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

Abstract: An image decoding method according to the present document may comprise the steps of: if a current block is partitioned into sub-partition transform blocks, deriving a prediction sample of the current block on the basis of intra prediction mode information; determining an LFNST set including LFNST matrices on the basis of an intra prediction mode derived from the intra prediction mode information; selecting one of the LFNST matrices on the basis of the LFNST set and the LFNST index; deriving transform coefficients for the sub-partition transform blocks on the basis of the selected LFNST matrix; and deriving residual samples for the current block on the basis of the transform coefficients.

公开(公告)号：US20240195977A1

公开(公告)日：2024-06-13

申请号：US18584548

申请日：2024-02-22

Applicant: LG Electronics Inc.

Inventor： Moonmo Koo ,  Jie Zhao ,  Hyeongmoon Jang ,  Seunghwan Kim ,  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 may comprise the steps of: receiving image information including residual information and an LFNST index from a bitstream; deriving a transform coefficient on the basis of the residual information; deriving a flag variable related to whether LFNST is applied to a current block on the basis of the LFNST index; and performing the LFNST on the basis of the flag variable and the transform coefficient, wherein the flag variable is derived for each color component of the current block.

公开(公告)号：US11973963B2

公开(公告)日：2024-04-30

申请号：US18089100

申请日：2022-12-27

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

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：US11962779B2

公开(公告)日：2024-04-16

申请号：US17775683

申请日：2020-11-09

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: deriving flag information indicating whether valid coefficients are present in a second area excluding a first area of the upper left corner of the current block; parsing an MTS index from a bitstream on the basis of the flag information indicating the absence of valid coefficients in the second area; and deriving residual samples for the current block by applying a conversion kernel derived on the basis of the MTS index to conversion coefficients of the first area, wherein the flag information may be derived by determining, for each scan sub-block in which the valid coefficients are scanned, whether the valid coefficients are present in the second area.

公开(公告)号：US11909972B2

公开(公告)日：2024-02-20

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

CPC classification number: 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：US11889080B2

公开(公告)日：2024-01-30

申请号：US17840181

申请日：2022-06-14

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

IPC: H04N19/122 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/91

CPC classification number: H04N19/122 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/91

Abstract: Techniques and systems for reconstructing a video signal, which include: obtaining a transform coefficient block by performing an entropy decoding and a dequantization for a current block; deriving a secondary transform corresponding to a specific area in the transform coefficient block, wherein the specific area represents an area including a top-left block of the transform coefficient block; performing an inverse secondary transform for each of subblocks within the specific area using the secondary transform; performing an inverse primary transform for a block which the inverse secondary transform is applied to; and reconstructing the current block using a block which the primary inverse transform is applied to.