Iris
Iris recognition is based on discriminating the fine structure of the textured area of the eye that
surrounds the pupil. Most commercial iris sensors collect a digital image of the eye using a silicon
imager and near-infrared or visible illumination. One of the most common commercial
implementations of an iris feature extractor and matcher generates binary templates based on the
phase of a Gabor decomposition of a series of concentric annular rings within the iris [40, 41]. The
degree of correspondence of two such binary templates forms the basis of the determination of
biometric match.