公开(公告)号：US20220124351A1

公开(公告)日：2022-04-21

申请号：US17562923

申请日：2021-12-27

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/18 ,  H04N19/11 ,  H04N19/122 ,  H04N19/124 ,  H04N19/129 ,  H04N19/159 ,  H04N19/176 ,  H04N19/184 ,  H04N19/593 ,  H04N19/61 ,  H04N19/91

Abstract: An image decoding method according to the present disclosure includes deriving transform coefficients through dequantization based on the quantized transform coefficients for the target block; deriving modified transform coefficients based on an inverse reduced secondary transform (RST) for the transform coefficients; deriving residual samples for the target block based on an inverse primary transform for the modified transform coefficients; and generating a reconstructed samples based on the residual samples, and prediction samples derived based on an intra prediction mode for the target block, wherein the inverse RST is performed based on a transform kernel matrix selected from a transform set including a plurality of transform kernel matrices, the transform set is determined based on a mapping relationship according to the intra prediction mode applied to the target block, and a plurality of intra prediction modes including the intra prediction mode of the target block are mapped to one transform set.

公开(公告)号：US20220116587A1

公开(公告)日：2022-04-14

申请号：US17311044

申请日：2019-12-06

Applicant: LG Electronics Inc.

Inventor： Jane ZHAO ,  Seunghwan KIM

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/159 ,  H04N19/513

Abstract: The present invention provides a method of processing a video signal based on inter prediction, the method comprises constructing a merge list based on a neighboring block of a current block; adding a history-based merge candidate representing motion information of a previously coded block of the current block to the merge list; obtaining a merge index indicating a merge candidate used for inter prediction of the current block within the merge list; generating a prediction block of the current block based on motion information of the merge candidate indicated by the merge index; and adding a residual block of the current block to the prediction block to reconstruct the current block, wherein when the history-based merge candidate has motion information that is not redundant with a pre-defined merge candidate among merge candidates included in the merge list, the history-based merge candidate is added to the merge list.

公开(公告)号：US20220103849A1

公开(公告)日：2022-03-31

申请号：US17546599

申请日：2021-12-09

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/46 ,  H04N19/70 ,  H04N19/132 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method performed by a decoding device, according to the present document, comprises the steps of: deriving a chroma quantization parameter table on the basis of quantization parameter data; deriving a quantization parameter for combined chroma coding on the basis of the chroma quantization parameter table; deriving prediction samples of a current chroma block on the basis of prediction information; deriving transform coefficients of the current chroma block on the basis of residual information; deriving residual samples by dequantizing the transform coefficients on the basis of the quantization parameter; and generating a reconstructed picture on the basis of the prediction samples and the residual samples.

公开(公告)号：US20220086448A1

公开(公告)日：2022-03-17

申请号：US17535090

申请日：2021-11-24

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Junghak NAM ,  Seunghwan KIM

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

Abstract: 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：US20220078475A1

公开(公告)日：2022-03-10

申请号：US17419869

申请日：2019-12-31

Applicant: LG ELECTRONICS INC.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Mehdi SALEHIFAR

IPC: H04N19/52 ,  H04N19/137 ,  H04N19/70 ,  H04N19/176

Abstract: A method and device for processing a video signal are disclosed. More specifically, a method of processing a video signal based on inter prediction may comprise: deriving a motion vector predictor based on motion information of a neighboring block of a current block; deriving a motion vector difference of the current block based on layer information and index information; deriving a motion vector of the current block based on the motion vector predictor and the motion vector difference; generating a prediction block of the current block based on the motion vector of the current block; and generating a reconstructed block of the current block based on the prediction block and a residual block of the current block, wherein the layer information includes at least one syntax element indicating a layer group to which the current layer belongs.

公开(公告)号：US20220078450A1

公开(公告)日：2022-03-10

申请号：US17527951

申请日：2021-11-16

Applicant: LG ELECTRONICS INC.

Inventor： Mehdi SALEHIFAR ,  Seunghwan KIM

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

Abstract: 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：US20220038744A1

公开(公告)日：2022-02-03

申请号：US17503788

申请日：2021-10-18

Applicant: LG ELECTRONICS INC.

Inventor： Junghak NAM ,  Jaehyun LIM ,  Moonmo KOO ,  Seunghwan KIM

IPC: H04N19/60 ,  H04N19/176 ,  H04N19/159 ,  H04N19/18 ,  H04N19/122

Abstract: An image decoding method according to the present document comprises the steps of: acquiring prediction-related information and residual-related information for a current block; deriving transform coefficients for the current block on the basis of the residual-related information; and generating residual samples of the current block on the basis of the transform coefficients, wherein the residual-related information includes low-frequency non-separable transform (LFNST) index information indicating information relating to non-separable transform for a low-frequency transform coefficient of the current block on the basis of a matrix-based intra prediction (MIP) flag.

公开(公告)号：US20220038698A1

公开(公告)日：2022-02-03

申请号：US17501885

申请日：2021-10-14

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Jaehyun LIM ,  Junghak NAM ,  Seunghwan KIM

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/46 ,  H04N19/18 ,  H04N19/186 ,  H04N19/176

Abstract: An image decoding method according to the present document comprises the steps of: deriving a quantized transform coefficient for a current block on the basis of BDPCM; deriving a transform coefficient by performing dequantization on the quantized transform coefficient; and deriving a residual sample on the basis of the transform coefficient, wherein, when the BDPCM is applied to the current block, inverse non-separable transform is not applied to the transform coefficient.

公开(公告)号：US20220038691A1

公开(公告)日：2022-02-03

申请号：US17279459

申请日：2019-09-03

Applicant: LG ELECTRONICS INC.

Inventor： Ling LI ,  Seunghwan KIM ,  Jin HEO

IPC: H04N19/11 ,  H04N19/176 ,  H04N19/159 ,  H04N19/105 ,  H04N19/46

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: obtaining a reference sample line index of a current block and most probable mode (MPM)-related information; constructing an alternative MPM list on the basis of the reference sample line index; deriving an intra prediction mode of the current block on the basis of the alternative MPM list and the MPM-related information; and generating a predicted block of the current block on the basis of the intra prediction mode, wherein the alternative MPM list is constructed on the basis of an intra prediction mode of an upper adjacent block of the current block and an intra prediction mode of a left adjacent block of the current block.

公开(公告)号：US20220030237A1

公开(公告)日：2022-01-27

申请号：US17495718

申请日：2021-10-06

Applicant: LG ELECTRONICS INC.

Inventor： Seethal PALURI ,  Seunghwan KIM

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/50

Abstract: An image decoding method performed by a decoding device according to the present disclosure comprises the steps of: receiving a bitstream containing at least one of segmentation information of a current picture and prediction information for a current block included in the current picture; deriving a first segmentation structure of the current picture, which is based on multiple tiles, on the basis of the segmentation information of the current picture including at least one of information of the number of width-parsing columns, information of the last width, information of the number of height-parsing rows, and information of the last height; deriving a block predicted for the current block, on the basis of the prediction information for the current block contained in one of the multiple tiles; and generating reconstruction samples for the current block on the basis of the predicted block.