Patent ID: 11909958
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. 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 reference subblock on a collocated reference picture for a current subblock within a current block, deriving a motion vector of the reference subblock, deriving a subblock temporal motion vector predictor (sbTMVP) candidate based on the motion vector of the reference subblock, generating prediction samples based on a motion vector of the current subblock derived based on the sbTMVP candidate, generating residual samples based on the prediction samples, generating information on transform coefficients based on the residual samples, and encoding image information including the information on the transform coefficients; and
transmitting the data comprising the bitstream,
wherein the reference subblock on the collocated reference picture is derived based on a position of a center lower-right sample among four samples positioned at a center of the current subblock,
wherein for the reference subblock that is not available, the motion vector of the reference subblock is set as a base motion vector, and
wherein the base motion vector is derived on the collocated reference picture based on a position of a center lower-right sample among four samples located at a center of the current block.