公开(公告)号：US20210258604A1

公开(公告)日：2021-08-19

申请号：US17283926

申请日：2019-10-08

Applicant: LG Electronics Inc.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Jaehyun LIM

IPC: H04N19/52 ,  H04N19/176 ,  H04N19/132 ,  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：US20210258593A1

公开(公告)日：2021-08-19

申请号：US17232719

申请日：2021-04-16

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/44 ,  H04N19/159 ,  H04N19/176 ,  H04N19/625 ,  H04N19/70

Abstract: A method and a device for processing a video signal are disclosed. In particular, a method for decoding a video signal includes parsing a first syntax element indicating a primary transform kernel applied to a primary transform of a current block; determining whether a secondary transform is applicable to the current block based on the first syntax element; if the secondary transform is applicable to the current block, parsing a second syntax element indicating a secondary transform kernel applied to a secondary transform of the current block; deriving a secondary inverse-transformed block, by performing a secondary inverse-transform for a top-left specific region of the current block using a secondary transform kernel indicated by the second syntax element; and deriving a residual block of the current block, by performing a primary inverse-transform for the secondary inverse-transformed block using a primary transform kernel indicated by the first syntax element.

公开(公告)号：US20210243461A1

公开(公告)日：2021-08-05

申请号：US16325091

申请日：2016-08-19

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Junghak NAM ,  Jaehyun LIM

IPC: H04N19/44 ,  H04N19/137 ,  H04N19/119 ,  H04N19/105 ,  H04N19/159 ,  H04N19/186 ,  H04N19/176

Abstract: The present invention discloses an image processing method and an apparatus therefor. Specifically, an image decoding method may include: deriving motion information of a first prediction unit determined by a first partitioning mode of a current block and motion information of a second prediction unit determined by a second partitioning mode of the current block; generating a prediction block of the first prediction unit by using the motion information of the first prediction unit and generating a prediction block of the second prediction unit by using the motion information of the second prediction unit; and generating a prediction block of the current block in units of sub-prediction unit determined by combining the first prediction unit and the second prediction unit by using the first prediction block and the second prediction block, in which a most probable mode (MPM) list for the second partitioning mode may be configured according to the first partitioning mode, and the second partitioning mode may be determined within the MPM list.

公开(公告)号：US20210241018A1

公开(公告)日：2021-08-05

申请号：US17234340

申请日：2021-04-19

Applicant: LG Electronics Inc.

Inventor： Jaehyun LIM ,  Byeongmoon JEON ,  Seungwook PARK ,  Jaewon SUNG ,  Jungsun KIM ,  Yongjoon JEON ,  Joonyoung PARK ,  Younghee CHOI

IPC: G06K9/36 ,  H04N19/50 ,  H04N19/593 ,  H04N19/11 ,  H04N19/14 ,  H04N19/157 ,  H04N19/182 ,  H04N19/44 ,  H04N19/80 ,  H04N19/82

Abstract: New intra planar modes are introduced for predicting digital video data. As part of the new intra planar modes, various methods are offered for predicting a first sample within a prediction unit, where the first sample is needed for referencing to when processing the new intra planar modes. And once the first sample is successfully predicted, the new intra planar modes are able to predict a sample of video data within the prediction unit by processing a bi-linear interpolation of four previously reconstructed reference samples.

公开(公告)号：US20210235121A1

公开(公告)日：2021-07-29

申请号：US17058873

申请日：2019-05-31

Applicant: LG ELECTRONICS INC.

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

IPC: H04N19/625 ,  H04N19/62

Abstract: The present disclosure provides a method for reconstructing a video signal through a low-complexity Discrete Sine Transform-7 (DST7) design, including: obtaining a transform index of a current block from the video signal, wherein the transform index corresponds to any one of a plurality of transform combinations including combinations of DST7 and/or a Discrete Cosine Transform-8 (DCT8); deriving a transform combination corresponding to the transform index, wherein the transform combination includes a horizontal transform and a vertical transform, and wherein the horizontal transform and the vertical transform correspond to any one of the DST7 and the DCT8; performing an inverse transform on the current block in a vertical or horizontal direction using the DST7 or the DCT8; and reconstructing the video signal using the inverse transformed current block, wherein a 33-point Discrete Fourier Transform (DFT) is applied to the DST7 when the DST7 is 16×16 and a 65-point DFT is applied to the DST7 when the DST7 is 32×32.

公开(公告)号：US20210219001A1

公开(公告)日：2021-07-15

申请号：US17219184

申请日：2021-03-31

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon JANG ,  Junghak NAM ,  Jaehyun LIM

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

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure comprises the steps of: decoding, on the basis of a bitstream, an affine flag that indicates whether affine prediction is applicable to a current block and a sub-block TMVP flag that indicates whether a temporal motion vector predictor based on a sub-block of the current block is usable; determining whether to decode a predetermined merge mode flag that indicates whether to apply a predetermined merge mode to the current block, on the basis of the decoded affine flag and the decoded sub-block TMVP flag; deriving prediction samples of the current block on the basis of the determining of whether to decode the predetermined merge mode flag; and generating reconstructed samples of the current block based on the prediction samples of the current block.

公开(公告)号：US20210211729A1

公开(公告)日：2021-07-08

申请号：US17209854

申请日：2021-03-23

Applicant: LG ELECTRONICS INC.

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

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

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：US20210120252A1

公开(公告)日：2021-04-22

申请号：US17138662

申请日：2020-12-30

Applicant: LG ELECTRONICS INC.

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

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

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：US20210112252A1

公开(公告)日：2021-04-15

申请号：US16496288

申请日：2017-09-28

Applicant: LG ELECTRONICS INC.

Inventor： Jin HEO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/105 ,  H04N19/124

Abstract: An intra prediction method performed by a decoding device, according to the present disclosure, comprises the steps of: deriving an intra prediction mode for a current block; deriving neighboring samples of the current block; deriving reference samples for a target sample of the current block among the neighboring samples on the basis of the intra prediction mode; deriving weighted values of the reference samples for the target sample; and deriving a prediction sample of the target sample on the basis of the reference samples and the weighted values.

公开(公告)号：US20210021871A1

公开(公告)日：2021-01-21

申请号：US17042722

申请日：2019-05-01

Applicant: LG Electronics Inc.

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

IPC: H04N19/61 ,  H04N19/625 ,  H04N19/159 ,  H04N19/176

Abstract: The present disclosure provides a method for reconstructing a video signal based on low-complexity transform implementation including obtaining a transform index of a current block from the video signal, wherein the transform index corresponds to any one of a plurality of transform combinations including a combination of DST4 and/or DCT4; deriving a transform combination corresponding to the transform index, wherein the transform combination includes a horizontal transform and a vertical transform, and wherein the horizontal transform and the vertical transform correspond to at least one of the DST4 or the DCT4; performing an inverse transform in a vertical direction with respect to the current block by using the DST4; performing an inverse transform in a horizontal direction with respect to the current block by using the DCT4; and reconstructing the video signal by using the current block which the inverse transform is performed.