公开(公告)号：US20220264105A1

公开(公告)日：2022-08-18

申请号：US17732126

申请日：2022-04-28

Applicant: LG Electronics Inc.

Inventor： Moonmo Koo ,  Hyeongmoon Jang ,  Seunghwan Kim ,  Jaehyun Lim

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

Abstract: An image decoding method 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 on the basis of intra prediction mode information; 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; when the chroma block is not square, remapping the updated intra prediction mode to a wide-angle intra prediction mode; and determining an LFNST set including LFNST matrices on the basis of the remapped intra prediction mode.

公开(公告)号：US20220232214A1

公开(公告)日：2022-07-21

申请号：US17675716

申请日：2022-02-18

Applicant: LG ELECTRONICS INC.

Inventor： Jungah CHOI ,  Jin Heo ,  Sunmi Yoo ,  Jaehyun Lim ,  Jangwon Choi ,  Seunghwan Kim

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/18 ,  H04N19/176 ,  H04N19/70 ,  H04N19/46

Abstract: An image decoding method carried out by a decoding apparatus according to the present document comprises the steps of: acquiring, via a bitstream, image data comprising residual data, and prediction mode data for the current block; deriving the prediction mode of the current block on the basis of the prediction mode data; deriving prediction samples for the current block on the basis of the prediction mode; deriving residual samples for the current block on the basis of the residual data; and generating reconstructed samples for the current block on the basis of the prediction samples and residual samples.

公开(公告)号：US20220217401A1

公开(公告)日：2022-07-07

申请号：US17700139

申请日：2022-03-21

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

IPC: H04N19/61 ,  H04N19/18 ,  H04N19/176 ,  H04N19/132 ,  H04N19/122 ,  H04N19/186 ,  H04N19/169 ,  H04N19/105 ,  H04N19/159 ,  H04N19/127

Abstract: A video decoding method according to the present document comprises a step of deriving a modified transform coefficient, and the step of deriving the transform coefficient may comprise the steps of: determining whether an LFNST can be applied to the height and width of a current block on the basis of the tree type and color format of the current block; parsing an LFNST index if the LFNST can be applied; and deriving the modified transform coefficient on the basis of the LFNST index and an LFNST matrix.

公开(公告)号：US11381829B2

公开(公告)日：2022-07-05

申请号：US16325091

申请日：2016-08-19

Applicant: LG ELECTRONICS INC.

Inventor： Naeri Park ,  Junghak Nam ,  Jaehyun Lim

IPC: H04N19/44 ,  H04N19/137 ,  H04N19/119 ,  H04N19/105 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method may include: deriving motion information of a first prediction unit determined by a first partitioning mode of a current block and motion information of a second prediction unit determined by a second partitioning mode of the current block; generating a prediction block of the first prediction unit by using the motion information of the first prediction unit and generating a prediction block of the second prediction unit by using the motion information of the second prediction unit; and generating a prediction block of the current block in units of sub-prediction unit determined by combining the first prediction unit and the second prediction unit by using the first prediction block and the second prediction block.

公开(公告)号：US11368691B2

公开(公告)日：2022-06-21

申请号：US17043494

申请日：2019-03-29

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/122 ,  H04N19/14 ,  H04N19/176 ,  H04N19/625 ,  H04N19/105 ,  H04N19/513 ,  H04N19/51 ,  H04N19/103 ,  H04N19/70 ,  H04N19/423 ,  H04N19/55

Abstract: Reconstructing a video signal based on low-complexity DST7 design including obtaining a transform index of a current block from the video signal and deriving a transform combination corresponding to the transform index. The transform index corresponds to any one of a plurality of transform combinations including a combination of DST7 and/or DCT8, and the transform combination includes horizontal and vertical transforms that correspond to at least one of the DST7 or the DCT8. The reconstruction also includes performing an inverse transform in a vertical direction by using the DST7, performing an inverse transform in a horizontal direction by using the DCT8, and reconstructing the video signal by using the current block on which the inverse transform is performed. The DST7 includes Discrete Fourier Transform (DFT) and has a different type of DFT structure based on a size of the current block.

公开(公告)号：US11363289B2

公开(公告)日：2022-06-14

申请号：US16985118

申请日：2020-08-04

Applicant: LG ELECTRONICS INC.

Inventor： Jungdong Seo ,  Jaehyun Lim

IPC: H04N11/02 ,  H04N19/513 ,  H04N19/105 ,  H04N19/119 ,  H04N19/176 ,  H04N19/44 ,  H04N19/109 ,  H04N19/139 ,  H04N19/13 ,  H04N19/172 ,  H04N19/91

Abstract: An image decoding method performed by a decoding device according to the present invention comprises the steps of: acquiring information on inter prediction of a target block through a bit stream; deriving motion information of the target block on the basis of the information on inter prediction; deriving a prediction sample by performing inter prediction for the target block on the basis of the motion information; generating a reconstruction block on the basis of the prediction sample; deriving modified motion information of the target block on the basis of the reconstruction block; and updating the motion information of the target block on the basis of the modified motion information. According to the present invention, modified motion information of the target block can be calculated, and the motion information of the target block can be updated on the basis of the modified motion information, so that the overall coding efficiency can be improved.

公开(公告)号：US20220182620A1

公开(公告)日：2022-06-09

申请号：US17600012

申请日：2020-03-19

Applicant: LG ELECTRONICS INC.

Inventor： Seethal Paluri ,  Jaehyun Lim ,  Seunghwan Kim ,  Jie Zhao

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/184

Abstract: According to the disclosure of the present document, ALF parameters and/or LMCS parameters may be hierarchically signaled, thereby enabling a reduction in data volume to be signaled for video/image coding and an increase in coding efficiency.

公开(公告)号：US11356686B2

公开(公告)日：2022-06-07

申请号：US17266407

申请日：2019-08-08

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

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：US20220159299A1

公开(公告)日：2022-05-19

申请号：US17591431

申请日：2022-02-02

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Jaehyun Lim ,  Seunghwan Kim

IPC: H04N19/60 ,  H04N19/18 ,  H04N19/176 ,  H04N19/172 ,  H04N19/132 ,  H04N19/12

Abstract: An image decoding method according to the present document comprises a step of deriving a residual sample for a current block on the basis of a transform coefficient, wherein the step of deriving the transform coefficient can comprise the steps of: determining whether a sub block transform for performing a transform by dividing a coding unit is applied to the current block; determining whether a multiple transform selection (MTS), for which a plurality of transform kernels are used, is applied to the current block; and setting the size of a transform block to which the transform is to be applied, on the basis of whether the sub block transform is applied to the current block and whether the multiple transform selection is applied to the current block.

公开(公告)号：US20220150513A1

公开(公告)日：2022-05-12

申请号：US17581154

申请日：2022-01-21

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Jaehyun Lim ,  Seunghwan Kim

IPC: H04N19/18 ,  H04N19/176 ,  H04N19/70 ,  H04N19/186 ,  H04N19/96 ,  H04N19/124 ,  H04N19/60

Abstract: An image decoding method according to the present document comprises the steps of: deriving a transform coefficient for a current block on the basis of residual information; deriving a residual sample by applying, to the transform coefficient, at least one of LFNST and MTS; and 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, and the LFNST index may be parsed before the MTS index.