1. A method of evaluating the quality of an image, comprising: determining at least a parameter concerning a zone or a parameter concerning a distribution pattern of sampling points within the zone according to the image; identifying data that indicates position and optical characteristic value of each of the sampling points within the zone which are determined at least partially based on the determined parameter; performing Fourier analysis on the identified data relevant to each zone to obtain an image quality of the zone; and determining the quality of the image on the basis of the image quality of each zone.