| 摘要 |
A method and apparatus are provided for sub-pixel motion estimation which performs sub-pixel motion estimation in which the precision of a difference between a pixel value of a block to be searched and a pixel value of a block of a search area, i.e., the number of bits of the difference, is reduced. The method for sub-pixel motion estimation in inter-prediction includes (a) determining one integer pixel corresponding to an estimated block by performing integer-pixel motion estimation, (b) receiving a value of a sub-pixel that is adjacent to the determined integer pixel and a value of an integer pixel of a block to be searched, (c) reducing a difference between the value of the sub-pixel and the value of the integer pixel and reducing a bit precision of the difference, and (d) calculating a similarity using the difference whose bit precision is reduced.
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