公开(公告)号：US20220264107A1

公开(公告)日：2022-08-18

申请号：US17737573

申请日：2022-05-05

Applicant: LG ELECTRONICS INC.

Inventor： Seethal PALURI ,  Hendry Hendry ,  Seunghwan Kim ,  Jie Zhao

IPC: H04N19/132 ,  H04N19/159 ,  H04N19/174 ,  H04N19/46 ,  H04N19/70

Abstract: A video decoding method performed by a video decoding device according to the present document may comprise the steps of: acquiring image information from a bitstream, the image information including a picture header associated with the current picture including a plurality of slices; parsing, from the picture header, at least one of a first flag indicating whether information necessary for an inter-prediction operation for a decoding process is present in the picture header, or a second flag indicating whether information necessary for an intra-prediction operation for the decoding process is present in the picture header; generating prediction samples by performing at least one of intra-prediction or inter-prediction for the slices in the current picture on the basis of at least one of the first flag or the second flag; and generating reconstructed samples on the basis of the prediction samples.

公开(公告)号：US11418799B2

公开(公告)日：2022-08-16

申请号：US17560461

申请日：2021-12-23

Applicant: LG Electronics Inc.

Inventor： Jie Zhao ,  Seunghwan Kim

IPC: H04N19/186 ,  H04N19/132 ,  H04N19/176 ,  H04N19/169 ,  H04N19/70 ,  H04N19/96 ,  H04N19/117

Abstract: According to the disclosure of the present document, the resources necessary for an LMCS process may be reduced by limiting the range that an LMCS APS occupies in all APSs. Thus, the degree of complexity in LMCS may be reduced, and video/image coding efficiency may be increased.

公开(公告)号：US20220248036A1

公开(公告)日：2022-08-04

申请号：US17719090

申请日：2022-04-12

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Jin Heo ,  Seunghwan Kim ,  Sunmi Yoo ,  Ling Li ,  Jungah Choi

IPC: H04N19/186 ,  H04N19/105 ,  H04N19/136 ,  H04N19/176

Abstract: A video decoding method performed by a decoding apparatus according to the present disclosure includes deriving one of a plurality of cross-component linear model (CCLM) prediction mode as a CCLM prediction mode of the current chroma block, deriving a sample number of neighboring chroma samples of the current chroma block based on the CCLM prediction mode of the current chroma block, a size of the current chroma block, and a specific value; deriving the neighboring chroma samples of the sample number, calculating CCLM parameters based on the neighboring chroma samples and the down sampled neighboring luma samples, deriving prediction samples for the current chroma block based on the CCLM parameters and the down sampled luma samples and generating reconstructed samples for the current chroma block based on the prediction samples, wherein the specific value is derived as 2.

公开(公告)号：US11405614B2

公开(公告)日：2022-08-02

申请号：US17031089

申请日：2020-09-24

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

IPC: H04N19/122 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/91

Abstract: Systems and techniques for reconstructing a video signal include: obtaining a transform coefficient block by performing an entropy decoding and a dequantization for a current block; deriving a secondary transform corresponding to a specific area in the transform coefficient block, wherein the specific area represents an area including a top-left block of the transform coefficient block; performing an inverse secondary transform for each of subblocks within the specific area using the secondary transform; performing an inverse primary transform for a block which the inverse secondary transform is applied to; and reconstructing the current block using a block which the primary inverse transform is applied to.

公开(公告)号：US20220217361A1

公开(公告)日：2022-07-07

申请号：US17579108

申请日：2022-01-19

Applicant: LG ELECTRONICS INC.

Inventor： Jane ZHAO ,  Seethal Paluri ,  Seunghwan Kim

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

Abstract: The disclosure discloses a method for processing a video signal and an apparatus therefor. Specifically, a method of processing a video signal based on inter prediction includes constructing a first merge candidate list of a current block using a spatial merge candidate and temporal merge candidate of the current block, constructing a second merge candidate list by adding a history-based merge candidate indicating motion information of a block coded prior to the current block to the first merge candidate list, obtaining a merge index indicating a merge candidate applied to the current block within the second merge candidate list, and generating a prediction block of the current block using motion information of a merge candidate indicated by the merge index. The history-based merge candidate may be added to the first merge candidate list if the history-based merge candidate has motion information not overlapping motion information of a pre-defined merge candidate among merge candidates included in the first merge candidate list.

公开(公告)号：US11330261B2

公开(公告)日：2022-05-10

申请号：US17476190

申请日：2021-09-15

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo Koo ,  Jaehyun Lim ,  Junghak Nam ,  Seunghwan Kim

IPC: H04N19/12 ,  H04N19/96 ,  H04N19/159 ,  H04N19/70 ,  H04N19/61 ,  H04N19/132

Abstract: An image decoding method according to the present document comprises a step for performing inverse first-order transform and inverse non-separable transform on a residual sample. The inverse non-separable transform is performed on the basis of a transform index indicating a predetermined transform kernel matrix, the inverse first-order transform is performed on the basis of a multiple transform selection (MTS) index indicating MTS for a horizontal transform kernel and a vertical transform kernel, and a syntax element bin string for the transform index is derived on the basis of first context information when a tree type for a split structure of a target block is not a single tree type and is derived on the basis of second context information when the tree type is the single tree type.

公开(公告)号：US20220132171A1

公开(公告)日：2022-04-28

申请号：US17569337

申请日：2022-01-05

Applicant: LG ELECTRONICS INC.

Inventor： Jungah Choi ,  Jaehyun Lim ,  Sunmi Yoo ,  Jangwon Choi ,  Seunghwan Kim

IPC: H04N19/70 ,  H04N19/12 ,  H04N19/176 ,  H04N19/61

Abstract: A method for decoding an image by a decoding device, according to the present document, comprises the steps of: acquiring image information; and generating a reconstructed picture on the basis of the image information.

公开(公告)号：US20220116629A1

公开(公告)日：2022-04-14

申请号：US17556095

申请日：2021-12-20

Applicant: LG Electronics Inc.

Inventor： Jie Zhao ,  Seunghwan Kim

IPC: H04N19/186 ,  H04N19/132 ,  H04N19/176 ,  H04N19/136 ,  H04N19/44

Abstract: According to the disclosure of the present document, LMCS may also be applied to a block having a dual tree sturcture. In addition, the number of LMCS APS may be limited. Therefore, an LMCS procedure may be efficiently performed, and the complexity of LMCS may be reduced. As the performance of LMCS is improved, the video/image coding efficiency may be increased.

公开(公告)号：US20220116590A1

公开(公告)日：2022-04-14

申请号：US17555249

申请日：2021-12-17

Applicant: LG ELECTRONICS INC.

Inventor： Hyeongmoon Jang ,  Naeri Park ,  Seunghwan Kim

IPC: H04N19/105 ,  H04N19/50 ,  H04N19/132 ,  H04N19/176 ,  H04N19/119

Abstract: A decoding method performed by a decoding device, according to the present document, may comprise the steps of: acquiring a sequence parameter set from a bitstream; acquiring a combined inter-picture merge and intra-picture prediction (CIIP) enable flag from the sequence parameter set; determining, on the basis of the CIIP enable flag and the size of a current block, whether a regular merge flag is included in the bitstream; parsing the regular merge flag in the bitstream on the basis that a condition based on the CIIP enable flag and a condition based on the size of the current block are satisfied; generating prediction samples of the current block on the basis of the regular merge flag; and generating a restoration picture on the basis of the prediction samples.

公开(公告)号：US11303929B2

公开(公告)日：2022-04-12

申请号：US17044590

申请日：2019-03-22

Applicant: LG Electronics Inc.

Inventor： Mehdi Salehifar ,  Seunghwan Kim

IPC: H04N19/593 ,  H04N19/11 ,  H04N19/132 ,  H04N19/174 ,  H04N19/176

Abstract: A method for decoding an image by a decoding apparatus according to the present disclosure comprises the steps of: acquiring intra prediction mode information of a current block; rearranging the remaining intra prediction modes on the basis of a lookup table; deriving a subgroup of the current block on the basis of subgroup information; decoding remaining intra prediction mode information on the basis of a binarization method for the subgroup; deriving, as an intra prediction mode of the current block, an intra prediction mode indicated by the decoded remaining intra prediction mode information among the intra prediction modes included in the subgroup; and generating a prediction sample of the current block on the basis of the intra prediction mode.