A very fast and accuracy subpixel image registration or alignment based on cross correlation and modified moment algorithm . Its accuracy is around 0.01-0.1 pixel according to the SNR and the size of images.
Inputs
standimage: the first image
compimage: the second image. It should be the same size as the first image
Outputs
m: the shift in X
n: the shift in Y

This code is implemented based on the following algorithm. Please cite：
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6463241
Song Min, June, 2013