1. A method of determining a translation amount between a first image h of size (m×m) and second image z of size (n×n), where m>n, the method comprising: computing a correlation value between the second image z and a subimage of the first image h at a plurality of (x, y) coordinate sets of the first image h; storing correlation values and the associated (x, y) coordinate set in a suitable memory location; and determining the (x, y) coordinate set that maximizes the correlation value.