US 12,382,020 B2
Image decoding method for deriving weight index information for biprediction, and device for same
Naeri Park, Seoul (KR); Junghak Nam, Seoul (KR); and Hyeongmoon Jang, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Mar. 26, 2024, as Appl. No. 18/616,984.
Application 18/616,984 is a continuation of application No. 17/896,317, filed on Aug. 26, 2022, granted, now 11,973,938.
Application 17/896,317 is a continuation of application No. 17/550,847, filed on Dec. 14, 2021, granted, now 11,457,209, issued on Sep. 27, 2022.
Application 17/550,847 is a continuation of application No. PCT/KR2020/007523, filed on Jun. 10, 2020.
Claims priority of provisional application 62/861,989, filed on Jun. 14, 2019.
Prior Publication US 2024/0275947 A1, Aug. 15, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/105 (2014.01); H04N 19/132 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11)] 3 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the image decoding method comprising:
receiving image information including inter prediction mode information through a bitstream;
deriving an inherited affine candidate and a constructed affine candidate based on a neighboring block of a current block, based on the inter prediction mode information;
generating a merge candidate list of the current block based on the inherited affine candidate and the constructed affine candidate;
selecting one candidate from among candidates included in the merge candidate list;
deriving motion information on the current block based on the selected candidate;
generating L0 prediction samples and L1 prediction samples of the current block based on the motion information; and
generating prediction samples of the current block based on the L0 prediction samples, the L1 prediction samples, and weight information, wherein the weight information is weight information for a bi-prediction and is derived based on a weight index for the selected candidate,
wherein the constructed affine candidate includes control point motion vectors (CPMVs), and
wherein based on a case that the constructed affine candidate is generated based on {CP0, CP1, CP3}, a weight index for the constructed affine candidate is derived based on a weight index for the CP0, wherein the CP0 is related to a top-left corner of the current block, the CP1 is related to a top-right corner of the current block and the CP3 is related to a bottom-right corner of the current block.