Patent ID: 11902565
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A non-transitory computer-readable digital storage medium storing a bitstream generated by an image encoding method, the method comprising:
deriving a position of a current subblock within a current block based on a center sample position of the current subblock;
deriving a reference subblock on a collocated reference picture based on the position of the current subblock;
deriving a subblock temporal motion vector predictor (sbTMVP) candidate based on a motion vector of the reference subblock;
deriving a motion vector of the current subblock based on the sbTMVP candidate;
generating prediction samples of the current block based on the motion vector of the current subblock;
generating residual samples derived based on the prediction samples; and
encoding image information including information on the residual samples to output the bitstream,
wherein the center sample position represents a position of a right-lower center sample positioned at a bottom right, among four samples positioned at the center,
wherein for the reference subblock that is available, a motion vector of the available reference subblock is derived as the sbTMVP candidate,
wherein the motion vector of the available reference subblock is derived based on a motion vector of a block covering a modified location derived based on a top-left sample position of the reference subblock, and
wherein the modified location is derived by an equation ((xColSb>>3)<<3, (yColSb>>3)<<3), where the xColSb and the yColSb represent the x coordinate and y coordinate of the sample position of the reference subblock derived based on the center sample position of the current subblock, respectively, and >> represents an arithmetic right shift, and << represents an arithmetic left shift.