公开(公告)号：US11831918B2

公开(公告)日：2023-11-28

申请号：US17503792

申请日：2021-10-18

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: receiving image information including residual information for a current block; and generating residual samples of the current block on the basis of the residual information, wherein the residual information includes information on transform coefficients of the current block, and the residual samples are generated from the information on the transform coefficients on the basis of low-frequency non-separable transform (LFNST) index information.

公开(公告)号：US11812059B2

公开(公告)日：2023-11-07

申请号：US17892740

申请日：2022-08-22

Applicant: LG Electronics Inc.

Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

IPC: H04N11/02 ,  H04N19/61 ,  H04N19/12 ,  H04N19/124 ,  H04N19/132 ,  H04N19/157 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/169 ,  H04N19/70

CPC classification number: H04N19/61 ,  H04N19/12 ,  H04N19/124 ,  H04N19/132 ,  H04N19/157 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/1883 ,  H04N19/70

Abstract: An image decoding method according to the present document comprises a step of deriving modified transform coefficients, wherein the step of deriving the modified transform coefficients comprises a step of setting an LFNST apply variable about whether to apply an LFNST on the basis of the tree type of the current block, a transform coefficient coding flag for each component of the current block, or a transform skip flag for each component of the current block, and can comprise a step of parsing an LFNST index on the basis of the value of the LFNST apply variable.

公开(公告)号：US11805263B2

公开(公告)日：2023-10-31

申请号：US17589215

申请日：2022-01-31

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

IPC: H04N19/176 ,  H04N19/18

CPC classification number: H04N19/176 ,  H04N19/18

Abstract: A video decoding method according to the present document comprises a step of deriving transform coefficients for a current block on the basis of residual information, wherein the step of deriving the transform coefficients comprises a step of deriving a zero-out block indicating a region in which effective transform coefficients may exist in the current block, wherein the zero-out block is derived on the basis of flag information indicating whether multiple transform selection (MTS), in which a plurality of transform kernels are used, can be applied to the current block.

公开(公告)号：US11805257B2

公开(公告)日：2023-10-31

申请号：US17699411

申请日：2022-03-21

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

IPC: H04N11/02 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60

CPC classification number: H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60

Abstract: An image decoding method includes a step of deriving a modified transform coefficient, wherein the step of deriving the modified transform coefficient includes the steps of: deriving a first variable indicating whether the transform coefficient exists in an area excluding a DC location of the current block; parsing an LFNST index based on the derivation result; and deriving the modified transform coefficient based on the LFNST index and an LFNST matrix, and based on the fact that the current block is divided into a plurality of sub-partition blocks, the LFNST index can be parsed without deriving the first variable.

公开(公告)号：US20230319311A1

公开(公告)日：2023-10-05

申请号：US18133799

申请日：2023-04-12

Applicant: LG ELECTRONICS INC.

Inventor： Seunghwan KIM ,  Medhi Salehifar ,  Moonmo Koo ,  Jaehyun Lim

IPC: H04N19/61 ,  H04N19/176 ,  H04N19/11 ,  H04N19/593

CPC classification number: H04N19/61 ,  H04N19/11 ,  H04N19/176 ,  H04N19/593

Abstract: The present disclosure, in a method of decoding a video signal, provides a method including checking whether a transform skip is applied to a current block; acquiring a transform index indicating transform types applied to a horizontal direction and a vertical direction of the current block from among a plurality of predefined transform types from the video signal when the transform skip is not applied to the current block; and performing an inverse primary transform on the current block using the transform types indicated by the transform index, wherein the transform types applied to the horizontal direction and the vertical direction of the current block are determined from among transform types defined according to an intra prediction mode of the current block based on the transform index.

公开(公告)号：US11616985B2

公开(公告)日：2023-03-28

申请号：US17034949

申请日：2020-09-28

Applicant: LG Electronics Inc.

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

IPC: H04N19/625 ,  H04N19/129 ,  H04N19/176 ,  H04N19/18

Abstract: The present disclosure provides a method of reconstructing a video signal based on a reduced secondary transform, which includes: obtaining a secondary transform index from the video signal; deriving a secondary transform corresponding to the secondary transform index, wherein the secondary transform represents a reduced secondary transform, and the reduced secondary transform represents a transform outputting L (L

公开(公告)号：US20230078291A1

公开(公告)日：2023-03-16

申请号：US17985577

申请日：2022-11-11

Applicant: LG Electronics Inc.

Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

IPC: H04N19/61 ,  H04N19/122 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

Abstract: An image decoding method according to the present document may include the steps of: deriving the position of the final significant coefficient in the current block and transform coefficients for the current block on the basis of residual information; determining whether the index of a sub-block including the final significant coefficient is 0 and whether the position of the final significant coefficient in the sub-block is greater than 0; determining whether a significant coefficient exists in a second area excluding a first area at the upper left end of the current block; and parsing an LFNST index from a bitstream when the position of the final significant coefficient is determined to be greater than 0 in the sub-block in which the index is 0, and the significant coefficient does not exist in the second area.

公开(公告)号：US11606557B2

公开(公告)日：2023-03-14

申请号：US17343274

申请日：2021-06-09

Applicant: LG ELECTRONICS INC.

Inventor： Bumshik Lee ,  Moonmo Koo ,  Jaehyun Lim

IPC: H04N19/176 ,  H04N19/61 ,  H04N19/625 ,  H04N19/12

Abstract: The present disclosure relates to a method for processing a video signal by using a linear relationship between transform types, comprising the steps of: determining a transform group on the basis of a prediction mode of a current block; parsing a transform combination index from a video signal, wherein the transform combination index indicates anyone of a plurality of transform combinations in the transform group; deriving a transform combination corresponding to the transform combination index, wherein the transform combination consists of a horizontal transform and a vertical transform, and includes DST-7 or DCT-8; performing inverse transform on the current block on the basis of the transform combination; and restoring the video signal by using the inverse transformed current block.

公开(公告)号：US11589075B2

公开(公告)日：2023-02-21

申请号：US17282120

申请日：2019-10-01

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/00 ,  H04N19/625 ,  H04N19/176 ,  H04N19/70 ,  H04N19/129

Abstract: Embodiments of the present invention provide a video signal processing method and device. Particularly, a method for decoding a video signal, may comprise the steps of: checking whether a transfer skip is applied to a current block; obtaining, from a video signal, a transform index for indicating a transform type set applied to the current block when the transform skip is not applied to the current block, wherein the transform type set includes transform types applied to the current block in horizontal and vertical directions; checking whether the transform type set includes DCT2; determining a region to which a primary transform is applied based on a checking result; and performing an inverse transform on the region to which the primary transform is applied in the horizontal and vertical directions using the transform types included in the transform type set.

公开(公告)号：US11589051B2

公开(公告)日：2023-02-21

申请号：US17360164

申请日：2021-06-28

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/122 ,  H04N19/167 ,  H04N19/176 ,  H04N19/61

Abstract: The embodiments of the present disclosure provides a method and apparatus for video signal processing. A method for decoding an image signal according to an embodiment of the present disclosure may include determining an input length and an output length of a non-separable transform based on a height and a width of a current block; determining a non-separable transform matrix corresponding to the input length and the output length of a non-separable transform; and applying the non-separable transform matrix to coefficients by a number of the input length in the current block, wherein the height and the width of a current block is greater than or equal to 8, wherein, if each of the height and the width of a current block is equal to 8, the input length of the non-separable transform is determined as 8.