1. An image processing method of generating a target image block of a position to be currently interpolated in an interpolated frame between two frames, comprising: performing a motion estimation for generating a motion vector by referring to a plurality of image blocks of the two frames, and generating a first image block according to the motion vector; generating a second image block according to two image blocks which are respectively in the two frames and both correspond to the position to be currently interpolated; and generating the target image block according to the first image block and the second image block.