公开(公告)号：US11882289B2

公开(公告)日：2024-01-23

申请号：US17894745

申请日：2022-08-24

申请人： LG Electronics Inc.

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

IPC分类号： H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18

CPC分类号： H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/18

摘要： An image decoding method, according to the present document, may comprise the steps of: deriving transform coefficients for a current block on the basis of residual information; determining whether a significant coefficient is present in a second region excluding a first region in the top-left end of the current block; parsing a LFNST index from a bitstream if the significant coefficient is not present in the second region; deriving modified transform coefficients by applying a LFNST matrix, derived on the basis of the LFNST index, to transform coefficients of the first region; and deriving residual samples of the current block on the basis of an inverse primary transform of the modified transform coefficients.

公开(公告)号：US11871035B2

公开(公告)日：2024-01-09

申请号：US18081297

申请日：2022-12-14

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

IPC分类号： H04N19/61 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

CPC分类号： H04N19/61 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

摘要： An image decoding method according to the present document comprises a step for deriving a modified transform coefficient, wherein the step for deriving the modified transform coefficient comprises a step for determining whether or not to parse an LFNST index on the basis of whether or not the width and height of a current block satisfy a condition about whether the LFNST can be applied, and whether or not the condition about whether the LFNST can be applied is satisfied is determined on the basis of a tree type and a color format of the current block and whether or not an ISP is applied to 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：US11758142B2

公开(公告)日：2023-09-12

申请号：US17729400

申请日：2022-04-26

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Hyeongmoon Jang ,  Seunghwan Kim ,  Jaehyun Lim

IPC分类号： H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

CPC分类号： H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

摘要： A method for image decoding, according to the present document, may comprise the steps of: deriving an intra prediction mode of a chroma block as a cross-component linear model (CCLM) mode; updating the intra prediction mode of the chroma block on the basis of an intra prediction mode of a luma block corresponding to the chroma block; and determining an LFNST set including LFNST matrices on the basis of the updated intra prediction mode, wherein the updated intra prediction mode is derived as an intra prediction mode corresponding to a specific position in the luma block, and the specific position is set on the basis of a color format of the chroma block.

公开(公告)号：US11729390B2

公开(公告)日：2023-08-15

申请号：US16605094

申请日：2018-03-13

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Seunghwan Kim

IPC分类号： H04N19/129 ,  H04N19/119 ,  H04N19/13 ,  H04N19/176 ,  H04N19/30

CPC分类号： H04N19/129 ,  H04N19/119 ,  H04N19/13 ,  H04N19/176 ,  H04N19/30

摘要： An image decoding method includes splitting a current block into a plurality of coefficient groups based on the current block is the non-square block, wherein the plurality of coefficient groups include a non-square coefficient group, obtaining coefficients corresponding to the plurality of coefficient groups based on a first scan order and a second scan order, wherein the first scan order represents a scan order among coefficients of the non-square coefficient group and wherein the second scan order represents a scan order among the plurality of coefficient groups, and reconstructing the image based on the coefficients.

公开(公告)号：US11641471B2

公开(公告)日：2023-05-02

申请号：US17610985

申请日：2020-05-27

申请人： LG ELECTRONICS INC.

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

IPC分类号： H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

摘要： An image decoding method according to the present document comprises the steps of: obtaining intra prediction mode information and an LFNST index; deriving an intra prediction mode of a current block on the basis of intra prediction mode information; when wide-angle intra prediction is applied to the current block, deriving a modified intra prediction mode by means of intra prediction mode remapping; deciding an LFNST set comprising LFNST matrices on the basis of the modified intra prediction mode; selecting one of the LFNST matrices on the basis of the LFNST set and LFNST index; and deriving transform coefficients for the current block on the basis of the selected LFNST matrix.

公开(公告)号：US11582486B2

公开(公告)日：2023-02-14

申请号：US17592768

申请日：2022-02-04

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

IPC分类号： H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

摘要： A video decoding method according to the present document is characterized by comprising: a step for deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; a step for deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) of the transform coefficients; and a step for 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 inverse RST using a transform kernel matrix is performed on transform coefficients of the upper-left 4×4 region of an 8×8 region of the target block, and the modified transform coefficients of the upper-left 4×4 region, upper-right 4×4 region, and lower-left 4×4 region of the 8×8 region are derived through the inverse RST.

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：US11503298B2

公开(公告)日：2022-11-15

申请号：US17555881

申请日：2021-12-20

申请人： LG Electronics Inc.

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

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

摘要： 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：US11483589B2

公开(公告)日：2022-10-25

申请号：US17394734

申请日：2021-08-05

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

IPC分类号： H04N11/02 ,  H04N19/61 ,  H04N19/119 ,  H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46

摘要： An image decoding method according to the present document comprises the steps of: receiving a quantized transform coefficient for a target block and a transform index for non-separable quadratic transform; deriving transform coefficients by inversely quantizing the quantized transform coefficient; deriving corrected transform coefficients on the basis of a transform kernel matrix in a predetermined transform set indicated by the transform index; and deriving residual samples for the target block on the basis of inverse linear transform for the corrected transform coefficients, wherein when the target block is divided into a predetermined number of sub-blocks and is coded by intra prediction, the corrected transform coefficients are derived in units of the sub-blocks, and the transform index is received for the target block.