For face recognition systems the major identification may be done by identifying the "Iris pattern". it saves the space of the image to be stored and for further processing.. the iris pattern is mostly used in all sort of identifications... No resemblances will occur in the iris pattern..so called as the GOLDEN TRIANGLE.
with the two eyes, nose bridge...
wish u all the success...
regards
Added after 7 minutes:
hi...
here is a link for finding a note on the IRIS pattern recognization..