1. An image processing system for comparing and correcting images, the system comprising: an image selection module operable to select monochromic images from a storage system; an image skeleton extraction module operable to extract skeletons of objects in the monochromic images to generate skeleton images; an image covering module operable to cover the skeleton images with the monochromic images to generate covered images; a variance correction module operable to correct allowable variances in the covered images; an image output module operable to output the covered images with corrected variances; and a processor that executes the image selection module, the image skeleton extraction module, the image covering module, the variance correction module, and the image output module.