Patent ID: 11924460
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An image decoding method, by a decoding apparatus, comprising:
obtaining prediction related information for a current block from a bitstream;
constructing an affine motion vector predictor (mvp) candidate list for the current block;
deriving control point motion vectors (CPMVs) for control points (CPs) of the current block based on the prediction related information and the affine mvp candidate list;
deriving prediction samples for the current block based on the CPMVs; and
generating a reconstructed picture for the current block based on the derived prediction samples,
wherein based on a constructed affine mvp candidate being available, the affine mvp candidate list includes the constructed affine mvp candidate,
wherein the constructed affine mvp candidate includes candidate motion vectors for a first CP, a second CP and a third CP of the current block,
wherein based on the candidate motion vectors for the first CP, the second CP and the third CP being available, the constructed affine mvp candidate is available, and
wherein based on at least one of a candidate motion vector for the first CP, a candidate motion vector for the second CP or a candidate motion vector for the third CP being not available, the constructed affine mvp candidate is not available and the constructed affine mvp candidate is not included in the affine mvp candidate list.