公开(公告)号：US20240205456A1

公开(公告)日：2024-06-20

申请号：US18286706

申请日：2022-04-12

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/122 ,  H04N19/129 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18

CPC classification number: H04N19/61 ,  H04N19/122 ,  H04N19/129 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18

Abstract: An image decoding method according to this document comprises a step of deriving, for transform coefficients, modified transform coefficients on the basis of inverse secondary transform, wherein: the step of deriving the modified transform coefficients may comprise a step of deriving a transform kernel to be applied to the inverse secondary transform; on the basis of both the horizontal and vertical lengths of a target block being greater than or equal to 8 and the horizontal or vertical length being 8, the transform kernel may be set to a 64×32 matrix; and on the basis of both the horizontal and vertical lengths of the target block being 8, a 64×16 matrix sampled from the 64×32 matrix may be applied to the inverse secondary transform of the target block.

公开(公告)号：US20240187599A1

公开(公告)日：2024-06-06

申请号：US18286007

申请日：2022-04-06

Applicant: LG Electronics Inc.

Inventor： Sunmi YOO ,  Junghak NAM ,  Jaehyun LIM ,  Naeri PARK ,  Jangwon CHOI

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/33

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/33

Abstract: An image decoding method performed by a decoding apparatus according to the present document comprises the steps of: deriving an intra prediction mode of a current block; scaling neighboring samples for the current block so as to derive modified neighboring reference samples for the current block; deriving prediction samples for the current block on the basis of the intra prediction mode and the modified neighboring reference samples; deriving a reconstructed block for the current block on the basis of the prediction samples; and upscaling the reconstructed block so as to derive a modified reconstructed block.

公开(公告)号：US20240146965A1

公开(公告)日：2024-05-02

申请号：US18545642

申请日：2023-12-19

Applicant: LG Electronics Inc.

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

IPC: H04N19/60 ,  H04N19/105 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

CPC classification number: H04N19/60 ,  H04N19/105 ,  H04N19/124 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70

Abstract: 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.

公开(公告)号：US20240121394A1

公开(公告)日：2024-04-11

申请号：US17767380

申请日：2020-10-08

Applicant: LG ELECTRONICS INC.

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

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

CPC classification number: H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46

Abstract: An image decoding method according to the present document may be characterized by including the steps of: determining whether to parse an MTS index for applying MTS to the current block; and applying the MTS to the current block on the basis of the MTS index to derive residual samples for the current block, wherein whether to parse the MTS index is determined on the basis of a flag value indicating whether a transform coefficient for a luma component of the current block is present, and the MTS index is not parsed when the flag value is 0.

公开(公告)号：US20240121393A1

公开(公告)日：2024-04-11

申请号：US18542173

申请日：2023-12-15

Applicant: LG Electronics Inc.

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

IPC: H04N19/13 ,  H04N19/119 ,  H04N19/124 ,  H04N19/176 ,  H04N19/61

CPC classification number: H04N19/13 ,  H04N19/119 ,  H04N19/124 ,  H04N19/176 ,  H04N19/61

Abstract: The present invention discloses a method for encoding/decoding a video signal and an apparatus for the method. More specifically, a method for decoding a video signal comprises generating a residual block of a current block by performing entropy decoding on the video signal; if size of the current block is smaller than a predetermined first size, parsing a transform skip flag which indicates whether a transform skip is applied to the current block; determining whether to parse a primary transform flag which indicates whether a primary transform is applied to the current block; if it is determined to parse the primary transform flag, parsing the primary transform flag; and if the primary transform flag indicates that a primary transform is applied to the current block, generating a primary inverse transformed transform block of the current block by performing a primary inverse transform to the residual block.

公开(公告)号：US20240121386A1

公开(公告)日：2024-04-11

申请号：US18542090

申请日：2023-12-15

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Jaehyun LIM ,  Jin HEO

IPC: H04N19/11 ,  H04N19/105 ,  H04N19/119 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

CPC classification number: H04N19/11 ,  H04N19/105 ,  H04N19/119 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

Abstract: Disclosed are an intra-prediction mode-based image processing method and a device therefor. Particularly, a method for processing an image on the basis of an intra-prediction mode may comprise the steps of: configuring a reference sample to be used for prediction of a current block on the basis of width information and height information of the current block when the current block is a non-square block; deriving an intra-prediction mode of the current block; and generating a prediction sample of the current block by using the reference sample on the basis of the intra-prediction mode of the current block.

公开(公告)号：US20240107056A1

公开(公告)日：2024-03-28

申请号：US18525164

申请日：2023-11-30

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Jaehyun LIM

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

CPC classification number: H04N19/52 ,  H04N19/132 ,  H04N19/176 ,  H04N19/31 ,  H04N19/55

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：US20230396788A1

公开(公告)日：2023-12-07

申请号：US18205501

申请日：2023-06-03

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/44 ,  H04N19/176 ,  H04N19/46 ,  H04N19/625 ,  H04N19/11 ,  H04N19/119 ,  H04N19/159 ,  H04N19/105

CPC classification number: H04N19/44 ,  H04N19/176 ,  H04N19/46 ,  H04N19/625 ,  H04N19/11 ,  H04N19/119 ,  H04N19/159 ,  H04N19/105

Abstract: 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.

公开(公告)号：US20230379501A1

公开(公告)日：2023-11-23

申请号：US18197529

申请日：2023-05-15

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/61 ,  H04N19/91 ,  H04N19/124 ,  H04N19/18 ,  H04N19/176

CPC classification number: H04N19/61 ,  H04N19/91 ,  H04N19/124 ,  H04N19/18 ,  H04N19/176

Abstract: Embodiments of the present invention provide video signal processing methods. A video signal encoding method according to an embodiment of the present invention comprises checking a transform block including residual samples except a prediction sample from a picture of the video signal, generating transform coefficients through a transform for the residual samples of the transform block based on a size of the transform block, and performing quantization and entropy coding the transform coefficients, wherein generating the transform coefficients includes, applying a forward primary transform to each of a horizontal direction and vertical direction of the transform block including the residual samples, and not applying a forward non-separable secondary transform to the transform block to which the primary transform has been applied when the size of the transform block is smaller than or equal to 4×4, and applying the forward non-separable secondary transform to the transform block when the size of the transform block is greater than 4×4.

公开(公告)号：US20230379489A1

公开(公告)日：2023-11-23

申请号：US18224852

申请日：2023-07-21

Applicant: LG Electronics Inc.

Inventor： Naeri PARK ,  Jaehyun LIM ,  Junghak NAM

IPC: H04N19/513 ,  H04N19/103 ,  H04N19/44 ,  H04N21/235 ,  H04N19/537 ,  H04N19/119 ,  H04N19/176

CPC classification number: H04N19/513 ,  H04N19/103 ,  H04N19/44 ,  H04N21/235 ,  H04N19/537 ,  H04N19/119 ,  H04N19/176

Abstract: A video decoding method performed by a decoding apparatus comprises deriving control points (CPs) for the current block; obtaining motion vectors for the CPs; deriving a motion vector of a sub-block or a sample unit in the current block on the basis of the obtained motion vectors; deriving a prediction sample for the current block on the basis of the derived motion vector; and generating a reconstruction sample on the basis of the prediction sample. The method enables effective performance of inter prediction through the motion vectors (transformation prediction), not only when an image in the current block is moved in a plane, but also when the image in the current block is rotated, zoomed in, zoomed out, or transformed into a parallelogram. Accordingly, the amount of data for the residual signal for the current block can be eliminated or reduced, and the overall coding efficiency can be improved.