1. A method of aligning a first image with a second image, the method comprising the steps of; (i) approximately locating the second image; (ii) scaling the first image to the approximate size of the second image; (iii) positioning the scaled first image over the approximate location of the second image; (iv) generating a measure of fit between the first image and the second image; (v) re-positioning the second image and repeating steps (iv) and (v) to obtain an increased measure of fit value.