Image Registration Methods for Astronomy
(intended for *extended emission*, not stellar images!)

Documentation:
image-registration.rtfd.org

Borrows heavily from
http://www.mathworks.com/matlabcentral/fileexchange/18401-efficient-subpixel-image-registration-by-cross-correlation/content/html/efficient_subpixel_registration.html

and replicates much of the functionality of 
http://www.astro.ucla.edu/~mperrin/IDL/sources/subreg.pro

and implements 
http://solarmuri.ssl.berkeley.edu/~welsch/public/software/cross_cor_taylor.pro
CHANGES
-------

0.2 - new, faster, iterative chi^2 method.  Works for non-uniform error
0.1 - original version, worked for uniform error