公开(公告)号：US20220239937A1

公开(公告)日：2022-07-28

申请号：US17677410

申请日：2022-02-22

Applicant: LG Electronics Inc.

Inventor： Nae Ri PARK ,  Jung Hak NAM ,  Hyeong Moon JANG

IPC: H04N19/46 ,  H04N19/70 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/174

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method comprises deriving a first flag specifying whether to perform weighted prediction on a current block and a weight index BcwIdx of bi-prediction with CU-level weight (BCW) for the current block, determining whether to perform default weighted prediction or explicit weighted prediction on the current block based on the first flag and BcwIdx, and generating a prediction block for the current block by performing the determined method.

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：US20220166986A1

公开(公告)日：2022-05-26

申请号：US17438003

申请日：2020-03-13

Applicant: LG Electronics Inc.

Inventor： Hyeong Moon JANG ,  Jung Hak NAM

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/176 ,  H04N19/593 ,  H04N19/137 ,  H04N19/186 ,  H04N19/119

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure comprises determining whether a prediction mode of a current block is an intra block copy (IBC) mode based on information on the prediction mode of the current block, based on the prediction mode of the current block being an IBC mode, deriving motion information of the current block based on motion information of a corresponding block corresponding to the current block, and generating a prediction block for the current block, by performing IBC prediction based on the derived motion information of the current block. Based on absence of motion information of the corresponding block, the motion information of the current block is derived based on default motion information.

公开(公告)号：US20220060751A1

公开(公告)日：2022-02-24

申请号：US17521086

申请日：2021-11-08

Applicant: LG Electronics Inc.

Inventor： Jung Hak NAM ,  Moonmo KOO ,  Jaehyun LIM ,  Seung Hwan KIM

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

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may comprise generating a prediction block by performing intra prediction with respect to a current block, generating a residual block by performing inverse transform with respect to a transform coefficient of the current block, and reconstructing the current block based on the prediction block and the residual block. The inverse transform may comprise inverse primary transform and inverse secondary transform, and the inverse secondary transform may be performed based on whether intra prediction for the current block is matrix based intra prediction (MIP).