公开(公告)号：US20220312012A1

公开(公告)日：2022-09-29

申请号：US17840181

申请日：2022-06-14

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: The present disclosure provides a method for reconstructing a video signal, which includes: 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：US20220264141A1

公开(公告)日：2022-08-18

申请号：US17734959

申请日：2022-05-02

Applicant: LG ELECTRONICS INC.

Inventor： Jungdong SEO ,  Jaehyun LIM

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/119 ,  H04N19/176 ,  H04N19/44 ,  H04N19/109 ,  H04N19/139 ,  H04N19/13 ,  H04N19/172 ,  H04N19/91

Abstract: An image decoding method performed by a decoding device according to the present invention comprises the steps of: acquiring information on inter prediction of a target block through a bit stream; deriving motion information of the target block on the basis of the information on inter prediction; deriving a prediction sample by performing inter prediction for the target block on the basis of the motion information; generating a reconstruction block on the basis of the prediction sample; deriving modified motion information of the target block on the basis of the reconstruction block; and updating the motion information of the target block on the basis of the modified motion information. According to the present invention, modified motion information of the target block can be calculated, and the motion information of the target block can be updated on the basis of the modified motion information, so that the overall coding efficiency can be improved.

公开(公告)号：US20220256150A1

公开(公告)日：2022-08-11

申请号：US17732958

申请日：2022-04-29

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/119 ,  H04N19/96 ,  H04N19/132 ,  H04N19/18 ,  H04N19/176

Abstract: A method for decoding an image according to the present document may comprises the steps of: deriving a modified transform coefficient; checking whether the tree type for a current block is a dual tree chroma; determining whether an MIP mode applies to the current block on the basis of the current block not being the dual tree chroma; determining whether an LFNST application width and an LFNST application height corresponding to the current block are 16 or greater, on the basis of the MIP mode being applied to the current block; and parsing an LFNST index on the basis of the LFNST application width and the LFNST application height being 16 or greater.

公开(公告)号：US20220256147A1

公开(公告)日：2022-08-11

申请号：US17733656

申请日：2022-04-29

Applicant: LG Electronics Inc.

Inventor： Seungwook PARK ,  Jaehyun LIM ,  Yongjoon JEON ,  Chulkeun KIM ,  Jungsun KIM ,  Naeri PARK ,  Hendry HENDRY ,  Byeongmoon JEON ,  Joonyoung PARK

IPC: H04N19/117 ,  H04N19/159 ,  H04N19/176 ,  H04N19/136 ,  H04N19/82 ,  H04N19/86

Abstract: A deblocking filtering method, a boundary strength (bS) deriving method, and encoding/decoding method and apparatus using the methods are provided. The bS deriving method includes the steps of: deriving a boundary of a deblocking filtering unit block which is a unit block on which deblocking filtering is performed; and setting a bS for each bS setting unit block in the deblocking filtering unit block. Here, the step of setting the bS includes setting a bS value of a target boundary corresponding to the boundary of the deblocking filtering unit block as the bS setting unit block.

公开(公告)号：US20220239907A1

公开(公告)日：2022-07-28

申请号：US17611708

申请日：2020-05-18

Applicant: LG Electronics Inc.

Inventor： Ling LI ,  Jung Hak NAM ,  Jaehyun LIM ,  Jin HEO ,  Seung Hwan KIM

IPC: H04N19/117 ,  H04N19/186 ,  H04N19/423 ,  H04N19/70 ,  H04N19/82

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include determining a chroma array type of a current image, determining an adaptive loop filter (ALF) indicator of a chroma component based on the chroma array type, and performing ALF filtering with respect to a reconstructed image based on a value of the ALF indicator. The value of the ALF indicator may be determined to be a predetermined value without being obtained from a bitstream, based on the chroma array type being a predetermined type, and the value of the ALF indicator may be obtained from the bitstream, based on the chroma array type being not the predetermined type.

公开(公告)号：US20220224912A1

公开(公告)日：2022-07-14

申请号：US17607231

申请日：2020-05-12

Applicant: LG Electronics Inc.

Inventor： Nae Ri PARK ,  Jung Hak NAM ,  Hyeong Moon JANG ,  Jaehyun LIM ,  Seung Hwan KIM

IPC: H04N19/139 ,  H04N19/176 ,  H04N19/52 ,  H04N19/577 ,  H04N19/105 ,  H04N19/593 ,  H04N19/159

Abstract: An image encoding/decoding apparatus and method are provided. An image decoding method performed by an image decoding apparatus according to the present disclosure may comprise deriving a motion shift of a current block using motion information of a neighboring block of the current block, determining a collocated block of the current block using the motion shift, deriving a motion vector for at least one control point (CP) of the determined collocated block, and deriving at least one control point motion vector (CPMV) of the current block using the motion vector for the at least one CP.

公开(公告)号：US20220210476A1

公开(公告)日：2022-06-30

申请号：US17603543

申请日：2020-08-26

Applicant: LG Electronics Inc.

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

IPC: H04N19/70 ,  H04N19/176 ,  H04N19/132 ,  H04N19/12 ,  H04N19/18 ,  H04N19/60

Abstract: A method for decoding a video performed by a decoding device according to the present document is characterized by comprising: a step for acquiring video information including residual syntax elements for a current residual coefficient in a current block; a step for deriving the current residual coefficient on the basis of the residual syntax elements; and a step for deriving a reconstructed sample of the current block on the basis of the current residual coefficient.

公开(公告)号：US20220182677A1

公开(公告)日：2022-06-09

申请号：US17592301

申请日：2022-02-03

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/11 ,  H04N19/124 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

Abstract: An image decoding method according to the present document comprises the steps of: deriving transform coefficients through inverse 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) for the transform coefficients; and generating, on the basis of an inverse primary transform for the modified transform coefficients, a restoration picture based on residual samples for the target block, wherein the modified transform coefficients derived according to the inverse RST are two-dimensionally arranged according to the order of a row priority direction or a column priority direction according to an intra prediction mode to be applied to the target block.

公开(公告)号：US20220182663A1

公开(公告)日：2022-06-09

申请号：US17441759

申请日：2020-03-18

Applicant: LG Electronics Inc.

Inventor： Jangwon CHOI ,  Jin HEO ,  Seunghwan KIM ,  Jaehyun LIM ,  Ling LI

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/11 ,  H04N19/70 ,  H04N19/105

Abstract: An image decoding method performed by a decoding device according to the present document comprises the steps of: deriving an intra prediction type for a current block from among intra prediction types; constituting an intra prediction mode candidate list of the current block on the basis of intra prediction modes of neighboring blocks of the current block; deriving an intra prediction mode of the current block on the basis of the intra prediction mode candidate list; and generating prediction samples of the current block on the basis of the intra prediction type and the intra prediction mode.

公开(公告)号：US20220174319A1

公开(公告)日：2022-06-02

申请号：US17671788

申请日：2022-02-15

Applicant: LG Electronics Inc.

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

IPC: H04N19/60 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/96

Abstract: An image decoding method according to the present document comprises a step of deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) regarding transform coefficients regarding a target block. The inverse RST is performed on the basis of transform sets determined on the basis of a mapping relation following an intra prediction mode applied to the target block, and a transform kernel matrix selected from two transform kernel matrices included in the transform sets, respectively, and and is performed on the basis of whether or not the inverse RST is applied, and a transform index indicating one of the transform kernel matrices included in the transform sets. A syntax element bin string regarding the transform index is decoded on the basis of a different context set according to the tree type regarding the division structure of the target block.