| CPC H04N 19/513 (2014.11) [H04N 19/176 (2014.11); H04N 19/587 (2014.11)] | 3 Claims |
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1. A decoding apparatus for image decoding, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
derive reference subblocks inside a collocated reference picture for subblocks in a current block;
derive a subblock-based temporal motion information candidate based on the reference subblocks;
derive motion information for the subblocks in the current block based on the subblock-based temporal motion information candidate;
generate prediction samples of the current block based on the motion information for the subblocks in the current block; and
generate reconstruction samples based on the prediction samples,
characterized in that
the reference subblocks are derived from the collocated reference picture by applying a motion shift to a below-right center sample position of each of the subblocks in the current block,
wherein the motion shift is performed based on a motion vector derived from a spatial neighbor block of the current block,
wherein the subblock-based temporal motion information candidate includes subblock unit motion vectors, and
wherein a base motion vector is used as a subblock unit motion vector for a reference subblock that is not available among the reference subblocks.
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