Patent ID: 11876960
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An image decoding method performed by a decoding apparatus, the method comprising:
receiving image information comprising inter prediction mode information through a bitstream;
generating a merge candidate list of a current block based on the inter prediction mode information;
selecting a candidate among candidates included in the merge candidate list;
deriving motion information of the current block based on the selected candidate;
generating L0 prediction samples and L1 prediction samples based on the derived 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 derived based on weight index information for the selected candidate,
wherein the candidates include an inherited affine merge candidate and a constructed affine merge candidate,
wherein the inherited affine merge candidate is derived based on control point motion vectors (CPMVs) of a neighboring block of the current block,
wherein the constructed affine merge candidate includes CPMVs of control points (CPs),
wherein based on the constructed affine merge candidate including a CPMV for a CP0 and a bi-prediction being applied to the current block, weight index information for the constructed affine merge candidate is fixed to be equal to weight index information of a specific block among neighboring blocks of the CP0 of the current block, wherein the CP0 is related to a top-left corner of the current block,
wherein the specific block is a block used for deriving the CPMV for the CP0, and
wherein the constructed affine merge candidate is inserted after the inherited affine merge candidate in the merge candidate list.