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

Claim 8:
9. A transmission method of data for an image, the method comprising:
obtaining a bitstream for the image, wherein the bitstream is generated based on 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; and
transmitting the data comprising the bitstream,
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.