Since 1999, I've been researching statistical methods for biometric devices such as fingerprints, iris scans, and facial recognition systems. I've been lucky enough to have generous support for that research from the National Science Foundation and the Center for Identification Research (CITeR). My research webpage is found:
That work has included a book that was published in 2010 by Springer, Computation Methods in Biometric Authentication. The software for the statistical methods from that book, known as CITeR PRESS or simply PRESS, can be downloaded here: PRESS Website.