1. An image registration method which comprises the steps of: obtaining a test image of an area; retrieving a reference image from a database wherein the reference image includes at least a portion of the area; decimating both the test image and the reference image using a predetermined decimation ratio; correlating a selected pixel of the decimated test image with a selected pixel of the decimated reference image; identifying a pixel in the test image and a pixel in the reference image, wherein the identified pixels respectively relate to the pixel selected in the correlating step; and manipulating the identified pixels to register the test image with the reference image.