after google search, I found this tidbit:

This problem is called "image registration" or "image stitching" or "image mosaicing". There are plently of papers written on the subject, most of which don't use AI techniques. The most widely used method is getting the Fourier transform of both images and comparing them; but this only works if there is no change in rotation between the images. I, personally, have written a paper to do just that using Zernike moments. Many other approaches exist, each with it's ups and downs.