公开(公告)号：US11632570B2

公开(公告)日：2023-04-18

申请号：US17473078

申请日：2021-09-13

申请人： LG ELECTRONICS INC.

发明人： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

IPC分类号： H04N19/593 ,  H04N19/122 ,  H04N19/176

摘要： Embodiments of the present disclosure provide a method and device for processing a video signal. A method for decoding an image signal according to an embodiment of the present disclosure comprises the steps of: determining a non-separable transform set index indicating a non-separable transform set used for a non-separable transform of a current block from among non-separable transform sets predefined on the basis of an intra-prediction mode of the current block; determining. as a non-separable transform matrix, a transform kernel indicated by a non-separable transform index for the current block from among transform kernels included in the non-separable transform set indicated by the non-separable transform set index; and applying the non-separable transform matrix to an upper left region which of the current block, which is determined according to the width and height of the current block, wherein each of the predefined non-separable transform sets includes two transform kernels.

公开(公告)号：US11589057B2

公开(公告)日：2023-02-21

申请号：US17527951

申请日：2021-11-16

申请人： LG ELECTRONICS INC.

发明人： Mehdi Salehifar ,  Seunghwan Kim

IPC分类号： H04N19/159 ,  H04N19/176 ,  H04N19/70 ,  H04N19/593 ,  H04N19/132

摘要： An image decoding method according to the present document can comprise the steps of: on the basis of first flag information indicating whether or not matrix-based intra prediction (MIP) can be applied to a current block, receiving second flag information indicating whether or not the MIP is used for the current block; receiving matrix-based intra prediction (MIP) mode information on the basis of the second flag information; generating intra prediction samples for the current block on the basis of the MIP mode information; and generating reconstructed samples for the current block on the basis of the intra prediction samples.

公开(公告)号：US11575919B2

公开(公告)日：2023-02-07

申请号：US17748847

申请日：2022-05-19

申请人： LG ELECTRONICS INC.

发明人： Jie Zhao ,  Seung Hwan Kim ,  Mehdi Salehifar

IPC分类号： H04N11/02 ,  H04N19/186 ,  H04N19/124 ,  H04N19/176 ,  H04N19/463 ,  H04N19/18 ,  H04N19/12 ,  H04N19/132

摘要： Provided are an image encoding/decoding method and device. The image decoding method performed by the image decoding device, according to the present disclosure, may comprise the steps of: determining a residual sample of a current block; and resetting the value of the residual sample on the basis of whether a color space transform is applied. The step for resetting the value of the residual block may be performed on the basis of a half value of a chroma residual sample value.

公开(公告)号：US11570475B2

公开(公告)日：2023-01-31

申请号：US17349311

申请日：2021-06-16

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Jaehyun Lim ,  Junghak Nam ,  Seunghwan Kim ,  Mehdi Salehifar

IPC分类号： H04N11/02 ,  H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

摘要： A video transform method includes: receiving a quantized transform coefficient for a target block and a transform index for a non-separated secondary transform; inverse-quantizing the quantized transform coefficient; deriving an input transform coefficient size indicating the length of the inverse-quantized transform coefficient to which the non-separated secondary transform has been applied, an output transform coefficient size indicating the length of a modified transform coefficient to which the non-separated secondary transform has been applied, and a transform set mapped to the intra mode of the target block, when the transform index does not indicate that the non-separated secondary transform is not performed; and deriving the modified transform coefficient on the basis of a matrix operation on a transform kernel matrix in the transform set indicated by the transform index, and a transform coefficient list corresponding to the input transform coefficient size.

公开(公告)号：US11570452B2

公开(公告)日：2023-01-31

申请号：US17568322

申请日：2022-01-04

申请人： LG ELECTRONICS INC.

发明人： Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim ,  Moonmo Koo

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

摘要： 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：US11457221B2

公开(公告)日：2022-09-27

申请号：US17526940

申请日：2021-11-15

申请人： LG ELECTRONICS INC.

发明人： Mehdi Salehifar ,  Seunghwan Kim

IPC分类号： H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

摘要： An image decoding method according to the present document can comprise the steps of: receiving flag information indicating whether a matrix-based intra prediction (MIP) is used with respect to a current block; receiving matrix-based intra prediction (MIP) mode information on the basis of the flag information; generating an intra prediction sample for the current block on the basis of the MIP mode information; and generating restoration samples for the current block on the basis of the intra prediction samples.

公开(公告)号：US11425421B1

公开(公告)日：2022-08-23

申请号：US17337148

申请日：2021-06-02

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim ,  Mehdi Salehifar

IPC分类号： H04N19/00 ,  H04N19/61 ,  H04N19/18 ,  H04N19/124 ,  H04N19/132 ,  H04N19/129 ,  H04N19/159 ,  H04N19/11 ,  H04N19/122 ,  H04N19/176

摘要： 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：US11412242B2

公开(公告)日：2022-08-09

申请号：US17266407

申请日：2019-08-08

申请人： LG ELECTRONICS INC.

发明人： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

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

摘要： 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：US11356702B2

公开(公告)日：2022-06-07

申请号：US15734806

申请日：2019-06-07

申请人： LG ELECTRONICS INC.

发明人： Seunghwan Kim ,  Mehdi Salehifar ,  Moonmo Koo ,  Jaehyun Lim

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

摘要： 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：US20220132146A1

公开(公告)日：2022-04-28

申请号：US17568322

申请日：2022-01-04

申请人： LG ELECTRONICS INC.

发明人： Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim ,  Moonmo Koo

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

摘要： 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.