公开(公告)号：US11895300B2

公开(公告)日：2024-02-06

申请号：US17967106

申请日：2022-10-17

Applicant: LG Electronics Inc.

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

IPC: H04N19/00 ,  H04N19/124 ,  H04N19/625 ,  H04N19/94 ,  H04N19/39

CPC classification number: H04N19/124 ,  H04N19/625 ,  H04N19/94 ,  H04N19/39

Abstract: An image decoding method according to the present document comprises a step of generating residual samples of a current block on the basis of residual information, wherein the residual information comprises a multiple transform selection (MTS) index and information regarding transform coefficients, the residual samples are generated from transform coefficients according to the information regarding the transform coefficients by using a transform kernel set, the transform kernel set is determined by the MTS index from among transform kernel set candidates, at least one of bins of a bin string of the MTS index is derived on the basis of context coding, the context coding is performed based on a value of a context index with respect to the MTS index.

公开(公告)号：US11882273B2

公开(公告)日：2024-01-23

申请号：US17558086

申请日：2021-12-21

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/60 ,  H04N19/12 ,  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：US11863778B2

公开(公告)日：2024-01-02

申请号：US17716772

申请日：2022-04-08

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/44 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/625 ,  H04N19/70

CPC classification number: H04N19/44 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/625 ,  H04N19/70

Abstract: The present invention relates to a video signal decoding method based on a Multiple Transform Selection (MTS). The method may comprise the steps of: parsing a first syntax element representing whether MTS applies to the inverse transformation of a current block, wherein the MTS represents a transform mode which uses a transform type other than a default transform type predefined for the current block; by performing inverse quantization on the current block, deriving an inverse-quantized transform coefficient array having the width and the height of the current block; determining, on the basis of the first syntax element, a vertical transform type applying to the vertical direction of the current block, and a horizontal transform type applying to the horizontal direction of the current block; and, by performing inverse transformation on the inverse-quantized transform coefficient array by using the vertical transform type and the horizontal transform type, deriving a residual sample array having the width and the height of the current block.

公开(公告)号：US11856224B2

公开(公告)日：2023-12-26

申请号：US17743187

申请日：2022-05-12

Applicant: LG Electronics Inc.

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

IPC: H04N19/61 ,  H04N19/11 ,  H04N19/122 ,  H04N19/124 ,  H04N19/129 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

CPC classification number: H04N19/61 ,  H04N19/11 ,  H04N19/122 ,  H04N19/124 ,  H04N19/129 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

Abstract: An image decoding method according to the present specification comprises the steps of: deriving transform coefficients through inverse quantization on the basis of quantized transform coefficient for a target block; deriving modified transform coefficients on the basis of inverse reduced secondary transform (RST) of the transform coefficients; and 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 step of deriving the modified transform coefficients is characterized in deriving 16 modified transform coefficients by applying a transform kernel matrix to 8 transform coefficients in a 4×4 region of the target block.

公开(公告)号：US11849151B2

公开(公告)日：2023-12-19

申请号：US18085348

申请日：2022-12-20

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Junghak Nam ,  Jaehyun Lim

IPC: H04N19/70 ,  H04N19/176 ,  H04N19/52

CPC classification number: H04N19/70 ,  H04N19/176 ,  H04N19/52

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: decoding, on the basis of a bitstream, an affine flag that indicates whether affine prediction is applicable to a current block and a sub-block TMVP flag that indicates whether a temporal motion vector predictor based on a sub-block of the current block is usable; determining whether to decode a predetermined merge mode flag that indicates whether to apply a predetermined merge mode to the current block, on the basis of the decoded affine flag and the decoded sub-block TMVP flag; deriving prediction samples of the current block on the basis of the determining of whether to decode the predetermined merge mode flag; and generating reconstructed samples of the current block based on the prediction samples of the current block.

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：US20230345033A1

公开(公告)日：2023-10-26

申请号：US18215656

申请日：2023-06-28

Applicant: LG ELECTRONICS INC.

Inventor： Jaehyun Lim ,  Naeri Park ,  Jungdong Seo ,  Junghak Nam

IPC: H04N19/51 ,  H04N19/53 ,  H04N19/70 ,  H04N19/513 ,  H04N19/523 ,  H04N19/176

CPC classification number: H04N19/51 ,  H04N19/53 ,  H04N19/70 ,  H04N19/513 ,  H04N19/523 ,  H04N19/176

Abstract: Disclosed are an inter prediction mode-based image processing method and an apparatus therefor. Particularly, a method for processing an image on the basis of inter prediction may comprise the steps of: determining whether a motion vector scale adaptation is applied to a block; up-scaling a down-scaled MVD(Motion Vector Difference) when the motion vector scale adaptation is applied to the block; deriving a MV(Motion Vector) for the block, using the up-scaled MVD and a MVP(Motion Vector Predictor); and generating a predictive block of the block, using the derived MV.