An iris scan is one of the most currently used methods of biometric authentication. Using a small camera, an iris scan system examines both irides of the individual's eyes. It then takes advantage of small details in the iris stromal pattern in order to attempt positive identification of an individual. Anthropologists have long established up to 400 items in the inherited feature space of the iris stroma and epithelium. The irides of identical twins are measurably different; There are differences between the left and the right eyes of an individual and differences in images of the same iris at different moments in time.
http://www.answers.com/topic/iris-scan?h...
Explain iris scanning in biometrics?
take a picture of your iris.
the scanning concept implies that the picture is processed one line at a time to come up with some values. You can't just compare the two pictures as it may not be the same size if you were further away.
You have seen in CSI or similar programs when a fingerprint is compared in a database. The fingerprint has certain loops and hooks measured to get the distance and relative position. They are actually comparing the lines that are superimposed on the image for a closeness match. The same would be true for the iris.
I would imagine they would use color and position of the black lines that run through the iris "muscle". The idea is to take a bunch of pictures eyes. Then get a second set of the same eyes different days and compare them to come up with an algorithm that allows the program to match up the eyes with as many false positives and false negatives as possible.
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