code and some data for the paper
Sathish Ramani, Zhihao Liu, Jeffrey Rosen, Jon-Fredrik Nielsen, J A Fessler.
"Regularization parameter selection for nonlinear iterative image restoration
and MRI reconstruction using GCV and SURE-based methods."
IEEE Trans. Im. Proc., 21(8):3659-72, Aug. 2012.
http://dx.doi.org/10.1109/TIP.2012.2195015

The data originally was in a subdirectory called "ZMAT"
so users will need to modify some paths containing that string
to run the code.