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

Claim 1:
2. An image encoding method performed by an encoding apparatus, the method comprising:
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,
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.