公开(公告)号：US20230113358A1

公开(公告)日：2023-04-13

申请号：US17791062

申请日：2021-05-24

Applicant: LG Electronics Inc.

Inventor： Hendry HENDRY ,  Hyeongmoon JANG ,  Junghak NAM ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/503 ,  H04N19/172 ,  H04N19/46 ,  H04N19/169

Abstract: According to the disclosure of the present document, image information acquired via a bitstream includes POC information, and a non-reference picture flag related to whether a picture is not used as a reference picture. A POC value of a current picture is derived on the basis of the POC information, and the POC information includes POC information of a previous picture in decoding order for the current picture. The previous picture in the decoding order for deriving the POC value of the current picture may be limited to a picture where a value of the non-reference picture flag is 0. Accordingly, an incorrect POC value can be prevented from being derived in video/image coding.

公开(公告)号：US20230080150A1

公开(公告)日：2023-03-16

申请号：US17988611

申请日：2022-11-16

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Hyeongmoon JANG ,  Seunghwan KIM ,  Jaehyun LIM

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

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：US20230053262A1

公开(公告)日：2023-02-16

申请号：US17962077

申请日：2022-10-07

Applicant: LG Electronics Inc.

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

IPC: H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

Abstract: A video transform method includes: receiving a quantized transform coefficient for a target block and a transform index for a non-separated secondary transform; inverse-quantizing the quantized transform coefficient; deriving an input transform coefficient size indicating the length of the inverse-quantized transform coefficient to which the non-separated secondary transform has been applied, an output transform coefficient size indicating the length of a modified transform coefficient to which the non-separated secondary transform has been applied, and a transform set mapped to the intra mode of the target block, when the transform index does not indicate that the non-separated secondary transform is not performed; and deriving the modified transform coefficient on the basis of a matrix operation on a transform kernel matrix in the transform set indicated by the transform index, and a transform coefficient list corresponding to the input transform coefficient size.

公开(公告)号：US20230036126A1

公开(公告)日：2023-02-02

申请号：US17790907

申请日：2021-01-11

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

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

Abstract: An image decoding method according to the present document comprises the steps of: applying an LFNST to transform coefficients so as to derive modified transform coefficients; and deriving residual samples for a target block on the basis of an inverse primary transform for the modified transform coefficients, wherein the step of deriving the transform coefficients comprises: determining whether a scaling list is applied to a current block on the basis of a tree type of the current block and whether the LFNST is applied; and deriving transform coefficients for the current block from residual information on the basis of the determination result, and when the tree type of the current block is a single tree and a chroma component, the scaling list can be applied.

公开(公告)号：US20230015210A1

公开(公告)日：2023-01-19

申请号：US17790928

申请日：2021-01-11

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

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

Abstract: An image decoding method according to the present document comprises the steps of: receiving residual information from a bitstream; deriving transform coefficients for a current block by performing inverse quantization on the basis of the residual information; and deriving modified transform coefficients by applying LFNST to the transform coefficients, wherein the inverse quantization is performed on the basis of a predetermined scaling list, and wherein whether to apply the scaling list can be derived on the basis of whether the LFNST is applied and a tree type of the current block.

公开(公告)号：US20230007264A1

公开(公告)日：2023-01-05

申请号：US17775682

申请日：2020-11-09

Applicant: LG Electronics Inc.

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

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

Abstract: An image decoding method according to the present document comprises a step of applying an inverse primary transform to a transform coefficient so as to derive residual samples for a current block, wherein: the inverse primary transform is performed on the basis of an MTS index received from a bitstream; the MTS index is parsed on the basis of an effective coefficient not existing in a second area that excludes the left top first area of the current block; and the first area is a left top 16×16 area of the current block.

公开(公告)号：US20230007258A1

公开(公告)日：2023-01-05

申请号：US17944068

申请日：2022-09-13

Applicant: LG ELECTRONICS INC.

Inventor： Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: According to an embodiment of the present invention, a picture decoding method performed by a decoding apparatus is provided. The method comprises: decoding image information comprising information on a quantization parameter (QP), deriving an expected average luma value of a current block from neighboring available samples, deriving a quantization parameter offset (QP offset) for deriving a luma quantization parameter (luma QP) based on the expected average luma value and the information on the QP, deriving the luma QP based on the QP offset, performing an inverse quantization for a quantization group comprising the current block based on the derived luma QP, generating residual samples for the current block based on the inverse quantization, generating prediction samples for the current block based on the image information and generating reconstructed samples for the current block based on the residual samples for the current block and the prediction samples for the current block.

公开(公告)号：US20220408095A1

公开(公告)日：2022-12-22

申请号：US17894026

申请日：2022-08-23

Applicant: LG ELECTRONICS INC.

Inventor： Jungah CHOI ,  Sunmi YOO ,  Jaehyun LIM ,  Jin HEO ,  Jangwon CHOI ,  Seunghwan KIM

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

Abstract: An image decoding method performed by a decoding apparatus, according to the present document, comprises the steps of: acquiring a transform skip available flag; acquiring a TSRC available flag on the basis of the transform skip available flag; acquiring prediction-related information regarding a current block; deriving a prediction sample of the current block on the basis of the prediction-related information; acquiring residual information of a residual coding syntax for the current block, derived on the basis of the TSRC available flag; deriving a residual sample of the current block on the basis of the residual information; and generating a reconstructed picture on the basis of the prediction sample and the residual sample.

公开(公告)号：US20220394290A1

公开(公告)日：2022-12-08

申请号：US17887911

申请日：2022-08-15

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Jaehyun LIM

IPC: H04N19/52 ,  H04N19/132 ,  H04N19/176 ,  H04N19/31

Abstract: A method for image decoding performed by a decoding apparatus according to the present disclosure comprises the steps of: deriving an ATMVP candidate for a current block; deriving merge candidates for the current block; deriving prediction samples for the current block on the basis of the merge candidates and the ATMVP candidate; and deriving reconstruction samples for the current block on the basis of the prediction samples, wherein the ATMVP candidate is a spatial neighboring block spatially adjacent to the current block.

公开(公告)号：US20220385912A1

公开(公告)日：2022-12-01

申请号：US17773234

申请日：2020-11-02

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/132 ,  H04N19/176 ,  H04N19/96 ,  H04N19/186 ,  H04N19/18

Abstract: An image decoding method according to the present document comprises the steps of: applying LFNST to transform coefficients to derive modified transform coefficients; deriving residual samples for a target block on the basis of an inverse primary transform for the modified transform coefficients; and generating a reconstructed picture on the basis of the residual samples, wherein the step of deriving the modified transform coefficients can comprise the steps of parsing an LFNST index on the basis of the current block tree type being a dual tree chroma, and deriving the modified transform coefficients on the basis of the LFNST index and an LFNST matrix.