A coarse-to-fine approach was presented. which can locate automaticall
y an important feature often used in face recognition, the centre of t
he iris on human face. It combines such techniques as local binarizati
on, Hough transform, pixels cluster and edge extraction. By this metho
d, one could attain high localization accuracy whether the photo is ta
ken under uniform or nonuniform light condition, whether the person we
ars glasses or not. So it is suitable for processing identification ph
otos.