Patent ID: 11949904
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A transmission method for data comprising a bitstream for an image, the method comprising:
obtaining the bitstream for the image; and
transmitting the data comprising the bitstream,
wherein the bitstream is generated by performing the steps of:
based on that a reference picture of a spatial neighboring block around a current block is the same as one pre-determined reference picture among reference pictures included in a reference picture list, deriving a collocated block of the current block in the one pre-determined reference picture using a motion vector of the spatial neighboring block;
deriving motion vectors of sub-blocks in the current block based on a motion vector of the collocated block;
generating prediction samples of the current block based on the motion vectors of the sub-blocks;
generating residual samples of the current block based on the prediction samples; and
generating a reference index indicating the one pre-determined reference picture, wherein the one pre-determined reference picture is defined in a picture header or a slice header.