公开(公告)号：US11831912B2

公开(公告)日：2023-11-28

申请号：US17963446

申请日：2022-10-11

Applicant: LG Electronics Inc.

Inventor： Junghak Nam ,  Jaehyun Lim ,  Moonmo Koo ,  Seunghwan Kim

IPC: H04N19/593 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/61 ,  H04N19/70

CPC classification number: H04N19/593 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/61 ,  H04N19/70

Abstract: An image coding method according to the present document comprises the steps of: deriving transform coefficients for a current block on the basis of residual-related information; and generating residual samples of the current block on the basis of the transform coefficients. The residual-related information comprises low frequency non-separable transform (LFNST) index information, showing information relating to non-separable transform for low-frequency transform coefficients of the current block, on the basis of a matrix-based intra-prediction (MIP) flag showing whether or not MIP is applied to the current block. The residual samples are generated from the transform coefficients on the basis of the LFNST index information.

公开(公告)号：US11825119B2

公开(公告)日：2023-11-21

申请号：US17668934

申请日：2022-02-10

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo

IPC: H04N19/625 ,  H04N19/122 ,  H04N19/176 ,  H04N19/61

CPC classification number: H04N19/625 ,  H04N19/122 ,  H04N19/176 ,  H04N19/61

Abstract: The present disclosure relates to a method for decoding a video signal based on adaptive multiple transforms (AMT). The method includes: obtaining an AMT index from the video signal, where the AMT index indicates any one of a plurality of transform combinations in a transform configuration group, and the transform configuration group includes discrete sine transform type 7 (DST7) and discrete cosine transform type 8 (DCT8); deriving a transform combination corresponding to the AMT index, where the transform combination includes a horizontal transform and a vertical transform, and at least one of the DST-7 or the DCT-8; performing an inverse transform on a current block on the basis of the transform combination; and restoring the video signal by using the inversely transformed current block. The AMT represents a transform scheme that is performed based on a transform combination adaptively selected from a plurality of transform combinations.

公开(公告)号：US11818352B2

公开(公告)日：2023-11-14

申请号：US18097775

申请日：2023-01-17

Applicant: LG ELECTRONICS INC.

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

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

CPC classification number: 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.

公开(公告)号：US11812022B2

公开(公告)日：2023-11-07

申请号：US17890991

申请日：2022-08-18

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Jaehyun Lim ,  Junghak Nam ,  Seunghwan Kim

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46

CPC classification number: H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46

Abstract: An image decoding method according to the present document comprises the steps of: deriving a quantized transform coefficient for a current block on the basis of BDPCM; deriving a transform coefficient by performing dequantization on the quantized transform coefficient; and deriving a residual sample on the basis of the transform coefficient, wherein, when the BDPCM is applied to the current block, inverse non-separable transform is not applied to the transform coefficient.

公开(公告)号：US11677986B2

公开(公告)日：2023-06-13

申请号：US17729597

申请日：2022-04-26

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/11 ,  H04N19/61 ,  H04N19/176 ,  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：US20230164332A1

公开(公告)日：2023-05-25

申请号：US18100781

申请日：2023-01-24

Applicant: LG ELECTRONICS INC.

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

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

CPC classification number: H04N19/18 ,  H04N19/91 ,  H04N19/176 ,  H04N19/60 ,  H04N19/46 ,  H04N19/184

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：US11647201B2

公开(公告)日：2023-05-09

申请号：US17699731

申请日：2022-03-21

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

IPC: H04N11/02 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/169 ,  H04N19/60

CPC classification number: H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/1883 ,  H04N19/60

Abstract: An image decoding method according to the present document comprises a step of deriving a corrected transform coefficient, wherein the step of deriving the corrected transform coefficient comprises the steps of: determining whether LFNST can be applied to the height and width of a divided sub-partition block when an ISP is applied to a current block; parsing a LFNST index when the LFNST can be applied; and deriving the corrected transform coefficient on the basis of the LFNST index and a LFNST matrix.

公开(公告)号：US11627320B2

公开(公告)日：2023-04-11

申请号：US17316049

申请日：2021-05-10

Applicant: LG Electronics Inc.

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

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

Abstract: An image decoding method performed by means of a decoding device according to the present disclosure comprises the steps of: deriving transform coefficients of a target block from a bitstream; deriving a non-separable secondary transform (NSST) index with respect to the target block; performing inverse transform with respect to the transform coefficients of the target block on the basis of the NSST index and thus deriving residual samples of the target block; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US11622114B2

公开(公告)日：2023-04-04

申请号：US17555837

申请日：2021-12-20

Applicant: LG Electronics Inc.

Inventor： Junghak Nam ,  Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

IPC: H04N11/02 ,  H04N19/132 ,  H04N19/13 ,  H04N19/176 ,  H04N19/18

Abstract: An image decoding method, according to the present document, comprises a step of generating residual samples for a current block on the basis of residual information, wherein the residual samples are generated on the basis of information on a transform kernel set and transform coefficients for the current block, the transform coefficients are derived on the basis of the residual information, and the information on the transform kernel set represents a transform kernel set to be applied to the current block from among transform kernel set candidates. At least one bin from among bins of a bin string of the information on the transform kernel set is derived on the basis of context coding, and the context coding is performed on the basis of at least one context model.

公开(公告)号：US11563937B2

公开(公告)日：2023-01-24

申请号：US17476696

申请日：2021-09-16

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.