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公开(公告)号:US11765389B2
公开(公告)日:2023-09-19
申请号:US17985577
申请日:2022-11-11
申请人: LG ELECTRONICS INC.
发明人: Moonmo Koo , Seunghwan Kim , Jaehyun Lim
IPC分类号: H04N19/122 , H04N19/61 , H04N19/132 , H04N19/176 , H04N19/18 , H04N19/70
CPC分类号: H04N19/61 , H04N19/122 , H04N19/132 , H04N19/176 , H04N19/18 , H04N19/70
摘要: An image decoding method according to the present document may include the steps of: deriving the position of the final significant coefficient in the current block and transform coefficients for the current block on the basis of residual information; determining whether the index of a sub-block including the final significant coefficient is 0 and whether the position of the final significant coefficient in the sub-block is greater than 0; determining whether a significant coefficient exists in a second area excluding a first area at the upper left end of the current block; and parsing an LFNST index from a bitstream when the position of the final significant coefficient is determined to be greater than 0 in the sub-block in which the index is 0, and the significant coefficient does not exist in the second area.
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公开(公告)号:US20230239563A1
公开(公告)日:2023-07-27
申请号:US18128132
申请日:2023-03-29
申请人: LG Electronics Inc.
发明人: Moonmo Koo , Seunghwan Kim , Jaehyun Lim
CPC分类号: H04N23/60 , G06F9/4812 , G06F9/4881
摘要: An image decoding method according to the present document comprises a step of deriving a corrected transform coefficient, wherein the step of deriving the corrected transform coefficient comprises the steps of: determining whether LFNST can be applied to the height and width of a divided sub-partition block when an ISP is applied to a current block; parsing a LFNST index when the LFNST can be applied; and deriving the corrected transform coefficient on the basis of the LFNST index and a LFNST matrix.
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公开(公告)号:US11711533B2
公开(公告)日:2023-07-25
申请号:US17671946
申请日:2022-02-15
申请人: LG ELECTRONICS INC.
发明人: Seunghwan Kim , Mehdi Salehifar , Moonmo Koo , Jaehyun Lim
IPC分类号: H04N19/44 , H04N19/176 , H04N19/46 , H04N19/625 , H04N19/11 , H04N19/119 , H04N19/159 , H04N19/105
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.
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公开(公告)号:US11700377B2
公开(公告)日:2023-07-11
申请号:US17535095
申请日:2021-11-24
申请人: LG Electronics Inc.
发明人: Moonmo Koo , Jaehyun Lim , Junghak Nam , Seunghwan Kim
IPC分类号: H04N19/132 , H04N19/176 , H04N19/18 , H04N19/186
CPC分类号: H04N19/132 , H04N19/176 , H04N19/18 , H04N19/186
摘要: An image decoding method according to the present document is characterized by including: a step for receiving a bitstream including residual information; a step for deriving transform coefficients for a target block on the basis of the residual information; a step for deriving corrected transform coefficients on the basis of an inverse non-separable transform of the transform coefficients; and a step for deriving residual samples for the target block on the basis of an inverse primary transform of the corrected transform coefficients, wherein the inverse non-separable transform is performed when the size of the target block is equal to or smaller than the size of a prescribed maximum transform application block.
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公开(公告)号:US11689745B2
公开(公告)日:2023-06-27
申请号:US17592301
申请日:2022-02-03
申请人: LG Electronics Inc.
发明人: Moonmo Koo , Seunghwan Kim , Jaehyun Lim
IPC分类号: G06V10/00 , H04N19/61 , H04N19/11 , H04N19/124 , H04N19/132 , H04N19/159 , H04N19/176 , H04N19/18
CPC分类号: H04N19/61 , H04N19/11 , H04N19/124 , H04N19/132 , H04N19/159 , H04N19/176 , H04N19/18
摘要: An image decoding method according to the present document comprises the steps of: deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) for the transform coefficients; and generating, on the basis of an inverse primary transform for the modified transform coefficients, a restoration picture based on residual samples for the target block, wherein the modified transform coefficients derived according to the inverse RST are two-dimensionally arranged according to the order of a row priority direction or a column priority direction according to an intra prediction mode to be applied to the target block.
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公开(公告)号:US11659186B2
公开(公告)日:2023-05-23
申请号:US17854540
申请日:2022-06-30
申请人: LG ELECTRONICS INC.
发明人: Moonmo Koo , Seunghwan Kim , 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 may comprise the steps of: receiving flag information, which indicates whether a scaling list is available while an LFNST is being performed, and an LFNST index and residual information for the current block; determining, on the basis of the flag information, the LFNST index, and the tree type of the current block, whether the scaling list is applicable to the current block; deriving transform coefficients for the current block from the residual information on the basis of the determination result; and applying the LFNST to the transform coefficients to derive corrected transform coefficients.
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公开(公告)号:US11647199B2
公开(公告)日:2023-05-09
申请号:US17385628
申请日:2021-07-26
申请人: LG ELECTRONICS INC.
发明人: Mehdi Salehifar , Seunghwan Kim , Moonmo Koo , Jaehyun Lim , Seethal Paluri
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: A method for decoding an image by a decoding device according to the present invention comprises the steps of: deriving, from a bit stream, transform coefficients of a block to be decoded; deriving residual samples of the block to be decoded, on the basis of a selective transform of the transform coefficients; and generating a reconstructed picture on the basis of the residual samples of the block to be decoded and prediction samples of the block to be decoded, wherein the selective transform is performed on the basis of a modified transform matrix, the modified transform matrix comprises a matrix including a modified basis vector, and the modified basis vector contains a certain number of elements selected from N elements.
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公开(公告)号:US11611776B2
公开(公告)日:2023-03-21
申请号:US17572282
申请日:2022-01-10
申请人: LG ELECTRONICS INC.
发明人: Moonmo Koo , Seunghwan Kim , Jaehyun Lim
IPC分类号: H04N19/60 , H04N19/122 , H04N19/124 , H04N19/132 , H04N19/176 , H04N19/18 , H04N19/70
摘要: An image decoding method according to the present document may comprise the steps of: deriving a first variable indicating whether there is a valid coefficient in a region excluding a DC region from a current block; deriving a second variable indicating whether there is a valid coefficient in a second region excluding a first region formed at the upper left end of the current block; when the first variable indicates that the valid coefficient exists in the region excluding the DC region, and the second variable indicates that the valid coefficient does not exist in the second region, parsing an LFNST index from the bitstream; and applying an LFNST matrix derived on the basis of the LFNST index to transform coefficients in the first region, to derive the modified transform coefficients.
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公开(公告)号:US11601679B2
公开(公告)日:2023-03-07
申请号:US17507446
申请日:2021-10-21
申请人: LG Electronics Inc.
发明人: Mehdi Salehifar , Seunghwan Kim , Moonmo Koo , Jaehyun Lim
IPC分类号: H04N19/00 , H04N19/60 , H04N19/105 , H04N19/124 , H04N19/176 , H04N19/18 , H04N19/70
摘要: An image decoding method performed by means of a decoding device according to the present invention comprises the steps of: deriving quantized transform coefficients with respect to a target block from a bitstream; performing inverse quantization with respect to the quantized transform coefficients with respect to the target block and deriving transform coefficients; deriving residual samples with respect to the target block on the basis of reduced inverse transform with respect to the transform coefficients; and generating a reconstructed picture on the basis of the residual samples with respect to the target block and prediction samples with respect to the target block. The reduced inverse transform is performed on the basis of a reduced inverse transform matrix. The reduced inverse transform matrix is a non-square matrix of which the number of columns is smaller than the number of rows.
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公开(公告)号:US11595691B2
公开(公告)日:2023-02-28
申请号:US17727516
申请日:2022-04-22
申请人: LG Electronics Inc.
发明人: Moonmo Koo , Hyeongmoon Jang , Seunghwan Kim , Jaehyun Lim
IPC分类号: H04N19/61 , H04N19/159 , H04N19/167 , H04N19/176 , H04N19/186
摘要: An image decoding method according to the present document comprises the steps of: updating an intra-prediction mode of a chroma block on the basis of an intra-prediction mode of a luma block corresponding to the chroma block on the basis of the intra-prediction mode of the chroma block being a cross-component linear model (CCLM) mode; and determining a LFNST set including LFNST matrixes 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 updated intra-prediction mode is updated as an intra-DC mode on the basis of the intra-prediction mode, that corresponds to the specific position, being an intra-block copy (IBC) mode.
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