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

Claim 0:
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining information on transform coefficients from a bitstream;
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 for the current block based on the information on the transform coefficients;
generating a reconstructed picture based on the prediction samples and the residual samples; and
applying a deblocking filtering on the reconstructed picture,
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.