1. An image-processing method which detects motion between plural images, the method comprising: a searching operation of searching for a local motion vector from each of blocks in the plural images on the basis of feature quantity of the plural images; and a calculating operation of calculating one or plural evaluated values of said local motion vector found, said image-processing method further including: one of said evaluated values is accuracy of position adjustment which is obtained when the search source block of said local motion vector is position-adjusted on a trial basis by using detected said local motion vector.