Patent ID: 11871029
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. An image encoding method performed by an encoding apparatus, the method comprising:
deriving a subblock based temporal merge candidate for a current block;
deriving affine candidates for the current block;
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 prediction samples;
generating information related to a prediction and residual information related to the residual samples; and
encoding image information including the information related to the prediction and the residual information,
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.