1. A method of registering a first image with a second image, the method comprising; a) identifying a plurality of points in the first image; b) identifying a plurality of points in the second image; c) for each of a plurality of pairs of subsets, each pair of subsets comprising a subset of the plurality points in the first image and a subset of the plurality of points in the second image, computing a transformation that maps the subset of points in the first image to the subset of points in the second image; d) identifying a likely transformation from the transformations for each of the plurality of subsets; and e) using the likely transformation in registering the first image and the second image.