公开(公告)号：US20220109883A1

公开(公告)日：2022-04-07

申请号：US17429569

申请日：2020-06-23

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Seunghwan KIM

IPC: H04N19/70 ,  H04N19/176 ,  H04N19/119 ,  H04N19/174 ,  H04N19/132 ,  H04N19/159

Abstract: A decoding method performed by a decoding device according to the present document comprises: a step for determining the prediction mode of a current block on the basis of information on a prediction mode acquired from a bitstream; a step for deriving movement information on the current block on the basis of the prediction mode; a step for generating prediction samples of the current block on the basis of the movement information; and a step for generating reconstructed samples on the basis of the prediction samples, wherein the step for determining the prediction mode may include a step for acquiring a regular merge flag from the bitstream on the basis of a combined inter-picture merge and intra-picture prediction (CIIP) available flag that indicates whether or not a CIIP is available.

公开(公告)号：US20220109879A1

公开(公告)日：2022-04-07

申请号：US17551794

申请日：2021-12-15

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/625 ,  H04N19/132 ,  H04N19/176 ,  H04N19/70

Abstract: Disclosed is a method for encoding/decoding video signals and an apparatus therefor. Specifically, a method for decoding a video signal based on reduced transform comprised the steps of: obtaining, from the video signal, a transform index indicating transform kernels applied to horizontal and vertical directions of a current block; determining a region in which a transform is applied to the current block based on the transform kernels indicated by the transform index and a size of the current block; deriving, as zero, coefficients of a remaining region other than the region to which the transform is applied within the current block; and performing an inverse transform on the region to which the transform is applied using the transform kernels indicated by the transform index.

公开(公告)号：US20220109859A1

公开(公告)日：2022-04-07

申请号：US17423667

申请日：2020-06-17

Applicant: LG Electronics Inc.

Inventor： Jie ZHAO ,  Seunghwan KIM

IPC: H04N19/186 ,  H04N19/132 ,  H04N19/109 ,  H04N19/70

Abstract: According to the disclosure of the present document, a luma mapping with chroma scaling (LMCS) process may be simplified, and a linear LMCS may be applied. Accordingly, the complexity of the LMCS may be reduced and video/image coding efficiency may be increased.

公开(公告)号：US20220109850A1

公开(公告)日：2022-04-07

申请号：US17555052

申请日：2021-12-17

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Seunghwan KIM

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

Abstract: A decoding method performed by a decoding device, according to the present document, may comprise the steps of: acquiring, from a bitstream, at least one of a combined inter-picture merge and intra-picture prediction (CIIP) enable flag and a coding unit (CU) skip flag indicating whether a skip mode is applied to a current block; acquiring, from the bitstream, a regular merge flag on the basis that a condition based on the current block size, and at least one of a condition based on the CIIP enable flag and a condition based on the CU skip flag are satisfied; generating prediction samples of the current block on the basis of the regular merge flag; and generating restoration samples on the basis of the prediction samples.

公开(公告)号：US20220109831A1

公开(公告)日：2022-04-07

申请号：US17555147

申请日：2021-12-17

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Naeri PARK ,  Seunghwan KIM

IPC: H04N19/109 ,  H04N19/52 ,  H04N19/176 ,  H04N19/105 ,  H04N19/159 ,  H04N19/70 ,  H04N19/119

Abstract: The present invention relates to an image decoding and encoding method capable of efficiently performing inter prediction by applying a regular merge mode to a current block, on the basis of a case where an MMVD mode, a merge subblock mode, a CIIP mode, and a partitioning mode, which performs prediction by dividing the current block into two partitions, are not available for the current block.

公开(公告)号：US20220103824A1

公开(公告)日：2022-03-31

申请号：US17344410

申请日：2021-06-10

Applicant: LG Electronics Inc.

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

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

Abstract: A video decoding method according to the present document comprises the steps of: deriving transform coefficients by performing de-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) of the transform coefficients; and 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 an inverse RST using a transform kernel matrix is performed on transform coefficients of an upper-left 4×4 region of an 8×8 region of the target block, and modified transform coefficients of the upper-left 4×4 region, an upper-right 4×4 region, and a lower-left 4×4 region of the 8×8 region are derived through the inverse RST.

公开(公告)号：US20220103821A1

公开(公告)日：2022-03-31

申请号：US17546507

申请日：2021-12-09

Applicant: LG Electronics Inc.

Inventor： Seethal PALURI ,  Seunghwan KIM ,  Jie ZHAO

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/186 ,  H04N19/70

Abstract: An image decoding method performed by a decoding apparatus according to the present document comprises the steps of: obtaining a flag indicating whether quantization parameter data for combined chroma coding is present on the basis of a type of chroma; obtaining the quantization parameter data for the combined chroma coding on the basis of the flag; deriving a chroma quantization parameter table on the basis of the quantization parameter data; deriving a quantization parameter for the combined chroma coding on the basis of the chroma quantization parameter table; deriving residual samples on the basis of the quantization parameter; and generating a reconstructed picture on the basis of the residual samples.

公开(公告)号：US20220078407A1

公开(公告)日：2022-03-10

申请号：US17419549

申请日：2020-01-02

Applicant: LG ELECTRONICS INC.

Inventor： Jane ZHAO ,  Seunghwan KIM

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/52 ,  H04N19/137 ,  H04N19/159

Abstract: The disclosure discloses a method for processing video signals and an apparatus therefor. The method may comprise: configuring a merge list based on a neighboring block of a current block; adding a history-based merge candidate in a history-based merge candidate list to the merge list when a number of merge candidates in the merge list is less than a predefined first specific number; adding a zero motion vector to the merge list when the number of merge candidates in the merge list is less than a maximum number of merge candidates; obtaining a merge index indicating a merge candidate used for the 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 updating the history-based merge candidate list based on the motion information of the merge candidate.

公开(公告)号：US20220060709A1

公开(公告)日：2022-02-24

申请号：US17432875

申请日：2020-02-26

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seunghwan KIM

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

Abstract: According to embodiment(s) disclosed in the present document, forward reshaping can be performed for inter prediction luma blocks averaged in a domain reshaped for luma mapping, and inverse reshaping is performed for intra prediction luma blocks averaged in an original domain or an average luma value of the intra prediction luma blocks inversely mapped in the original domain can be derived. In addition, a chroma residual scaling index can be derived on the basis of a simple bit shifting operation so that the method according to the present document can perform reshaping only for an average luma value (that is, one value) and can reduce the number of operations required for the reshaping.

公开(公告)号：US20210368165A1

公开(公告)日：2021-11-25

申请号：US17390654

申请日：2021-07-30

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Seunghwan KIM ,  Jin HEO

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/82 ,  H04N19/186 ,  H04N19/176

Abstract: A method by which a decoding device performs image decoding, according to the present document, comprises the steps of: deriving an intra prediction mode of the current chroma block in a cross-component linear model (CCLM) mode; deriving downsampled luma samples on the basis of the current luma block; deriving downsampled neighboring luma samples on the basis of neighboring luma samples of the current luma block; and deriving CCLM parameters on the basis of the downsampled neighboring luma samples and neighboring chroma samples of the current neighboring chroma block, wherein when a color format is 4:2:2, the downsampled luma samples are derived by filtering three adjacent current luma samples.