Kazuya Kodama Hiroshi Mo Akira Kubota Free Iris Scene Re-Focusing Based on a Three-Dimensional Filtering of Multiple Differently Focused Images. 2033-2036 2006 conf/icip/2006 ICIP http://dx.doi.org/10.1109/ICIP.2006.312846 db/conf/icip/icip2006.html#KodamaMK06