| CPC H04N 19/105 (2014.11) [H04N 19/139 (2014.11); H04N 19/176 (2014.11); H04N 19/51 (2014.11)] | 18 Claims |
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1. A video decoding method, comprising:
generating a merge list for a target block; and
performing inter prediction for the target block using the merge list,
wherein the merge list is generated based on information of a plurality of adjacent blocks spatially adjacent to the target block,
wherein the target block is composed of a plurality of sub-blocks corresponding to spatially partitioned regions of the target block, respectively,
wherein a size of the target block is greater than a size of each of the plurality of sub-blocks,
wherein the merge list is commonly used to derive initial motion vectors of the plurality of sub-blocks,
wherein a motion vector of a sub-block of the plurality of sub-blocks is derived based on an initial motion vector of the sub-block using a block matching between two blocks determined based on the initial motion vector,
wherein whether bi-directional inter prediction is used for the target block or not is checked to determine a type of prediction for the target block,
wherein the inter prediction derives the initial motion vectors of the plurality of sub-blocks using the merge list is performed in a case that the bi-directional inter prediction is used for the target block, and
wherein whether the inter prediction derives the initial motion vectors of the plurality of sub-blocks using the merge list is performed or not is determined using a difference between a Picture Order Count (POC) of a target picture comprising the target block and a POC of a reference picture for the target block.
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