Patent ID: 11871029
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:
obtaining information related to a prediction and residual information from a bitstream;
deriving a subblock based temporal merge candidate for a current block based on the information related to the prediction;
deriving affine candidates for the current block based on the information related to the prediction;
deriving a merge candidate list for the current block, wherein the merge candidate list includes the subblock based temporal merge candidate and the affine candidates;
deriving prediction samples for the current block based on the merge candidate list;
deriving residual samples for the current block based on the residual information; and
generating reconstructed samples based on the prediction samples and the residual samples,
wherein deriving the subblock based temporal merge candidate comprises:
deriving the motion vector of a left neighboring block of the current block;
deriving corresponding subblocks in a collocated picture based on the motion vector of the left neighboring block;
deriving subblock motion vectors of the corresponding subblocks; and
deriving the subblock based temporal merge candidate based on the subblock motion vectors,
wherein deriving the subblock based temporal merge candidate further comprises
deriving a base motion vector based on a motion vector related to a below-right center position of the current block, and
wherein based on a motion vector of a corresponding subblock not being available, the base motion vector is used as the subblock motion vector of the corresponding subblock.