公开(公告)号：US12132922B2

公开(公告)日：2024-10-29

申请号：US18205501

申请日：2023-06-03

申请人： LG ELECTRONICS INC.

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

IPC分类号： H04N19/44 ,  H04N19/105 ,  H04N19/11 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/625

CPC分类号： H04N19/44 ,  H04N19/105 ,  H04N19/11 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46 ,  H04N19/625

摘要： Provided is a method for decoding a video signal based on a reduced transform, which includes: checking whether a transform skip is applied to a current block; obtaining a transform index indicating a transform kernel of the current block from the video signal when the transform skip is not applied to the current block; determining a region where a primary transform is applied to the current block based on the transform kernel indicated by the transform index and a size of the current block; and performing an inverse primary transform on the region to which the primary transform is applied by using the transform kernel indicated by the transform index.

公开(公告)号：US12132903B2

公开(公告)日：2024-10-29

申请号：US18369493

申请日：2023-09-18

申请人： LG ELECTRONICS INC

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

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

CPC分类号： H04N19/122 ,  H04N19/167 ,  H04N19/176 ,  H04N19/61

摘要： 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：US12088830B2

公开(公告)日：2024-09-10

申请号：US18100781

申请日：2023-01-24

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

CPC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：US12081777B2

公开(公告)日：2024-09-03

申请号：US18090871

申请日：2022-12-29

申请人： LG ELECTRONICS INC.

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

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

CPC分类号： H04N19/186 ,  H04N19/12 ,  H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/463

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：US12003757B2

公开(公告)日：2024-06-04

申请号：US17438276

申请日：2020-03-10

申请人： LG ELECTRONICS INC.

发明人： Mehdi Salehifar ,  Seunghwan Kim

IPC分类号： H04N7/12 ,  H04N19/109 ,  H04N19/139 ,  H04N19/176 ,  H04N19/52

CPC分类号： H04N19/52 ,  H04N19/109 ,  H04N19/139 ,  H04N19/176

摘要： Embodiments of the present specification provide a method and a device for processing motion vector difference (MVD) information for inter prediction in a video signal. A method for decoding MVD information comprises the steps of: acquiring a first flag indicating whether a MVD for predicting the current block is greater than a first value; on the basis of the first flag, acquiring a second flag indicating whether the MVD is greater than a second value; and decoding size information of the MVD on the basis of the second flag, wherein a step for acquiring the size information of the MVD comprises a step for, if the MVD is equal to or smaller than the second value, decoding the size information of the MVD on the basis of a first difference value which corresponds to the difference between the second value and the first value.

公开(公告)号：US11949873B2

公开(公告)日：2024-04-02

申请号：US17775682

申请日：2020-11-09

申请人： LG Electronics Inc.

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

IPC分类号： H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46

CPC分类号： H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/46

摘要： An image decoding method according to the present document comprises a step of applying an inverse primary transform to a transform coefficient so as to derive residual samples for a current block, wherein: the inverse primary transform is performed on the basis of an MTS index received from a bitstream; the MTS index is parsed on the basis of an effective coefficient not existing in a second area that excludes the left top first area of the current block; and the first area is a left top 16×16 area of the current block.

公开(公告)号：US11792430B2

公开(公告)日：2023-10-17

申请号：US17671788

申请日：2022-02-15

申请人： LG Electronics Inc.

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

IPC分类号： H04N19/60 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/96

CPC分类号： H04N19/60 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/96

摘要： An image decoding method according to the present document comprises a step of deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) regarding transform coefficients regarding a target block. The inverse RST is performed on the basis of transform sets determined on the basis of a mapping relation following an intra prediction mode applied to the target block, and a transform kernel matrix selected from two transform kernel matrices included in the transform sets, respectively, and and is performed on the basis of whether or not the inverse RST is applied, and a transform index indicating one of the transform kernel matrices included in the transform sets. A syntax element bin string regarding the transform index is decoded on the basis of a different context set according to the tree type regarding the division structure of the target block.

公开(公告)号：US11528484B2

公开(公告)日：2022-12-13

申请号：US17296154

申请日：2019-12-06

申请人： LG ELECTRONICS INC.

发明人： Seethal Paluri ,  Seunghwan Kim ,  Mehdi Salehifar

IPC分类号： H04N19/137 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70

摘要： A method and device derive a motion vector difference of a current block based on layer information and index information, where the layer information indicates a current layer to which a motion vector difference used in inter prediction of the current block belongs and index information indicates a specific combination in the current layer, and thereby the MVD coding efficiency may be significantly increased by coding the horizontal and vertical components of the MVD together based on layer information and index information.

公开(公告)号：US11516484B2

公开(公告)日：2022-11-29

申请号：US17707000

申请日：2022-03-29

申请人： LG Electronics Inc.

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

IPC分类号： H04N19/18 ,  H04N19/119 ,  H04N19/129 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/60 ,  H04N19/70 ,  H04N19/96

摘要： An image decoding method according to the present document comprises: a residual coding step for parsing residual information received in a residual coding level and arranging transform coefficients for a current block according to a predetermined scanning order; a step for deriving residual samples by applying at least one of LFNST or MTS to the transform coefficients; and a step for generating a reconstructed picture on the basis of the residual samples, wherein the LFNST is performed on the basis of an LFNST index indicating an LFNST kernel, the MTS is performed on the basis of an MTS index indicating an MTS kernel, the LFNST index and the MTS index are signaled in a coding unit level, and the MTS index is signaled immediately after the signaling of the LFNST index.

公开(公告)号：US11445204B2

公开(公告)日：2022-09-13

申请号：US17526930

申请日：2021-11-15

申请人： LG ELECTRONICS INC.

发明人： Mehdi Salehifar ,  Seunghwan Kim

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

摘要： An image decoding method according to the present document may comprise the steps of: receiving flag information indicating whether or not matrix-based intra prediction (MIP) is to be used for a current block; receiving matrix-based intra prediction (MIP) mode information on the basis of the 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, wherein a syntax element bin string for the MIP mode information is binarized by using a truncated binarization method.