| CPC H04N 19/44 (2014.11) [H04N 19/105 (2014.11); H04N 19/132 (2014.11); H04N 19/176 (2014.11); H04N 19/513 (2014.11)] | 11 Claims |
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1. A method of decoding an image, comprising:
determining, based on a pre-defined condition, whether to perform motion modification on a current block in the image;
determining a search region for the motion modification of the current block;
deriving delta motion information of the current block based on a plurality of SAD candidates for the search region;
modifying initial motion information of the current block by using the delta motion information; and
generating a prediction block of the current block based on the modified motion information,
wherein the motion modification of the current block is performed only when a picture order count (POC) difference between a current picture including the current block and an L0 reference picture is the same as a POC difference between the current picture and an L1 reference picture,
wherein the L0 reference picture and the L1 reference picture have different temporal directions,
wherein, in response to a case where an initial SAD is less than a specific value, a search for the plurality of SAD candidates is not performed even though it is determined that the motion modification is performed on the current block,
wherein the initial SAD is derived based on reference blocks specified by the initial motion information of the current block, and
wherein the specific value is representative of a product of a width and height of the current block.
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