Overview
         The Iris as a Biometrics: The iris is an overt body that 
           is available for remote assessment with the aid of a 
           machine vision system to do automated iris 
           recognition.
         Iris recognition technology combines computer vision, 
           pattern recognition, statistical inference, and optics. 
         The spatial patterns that are apparent in the human iris 
           are highly distinctive to an individual.
             Clinical observations
             Developmental biology
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                              Overview
                The structureThe o structuref the iris se ofen in the hu a man eyetransverse section
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                 The structure of the iris seen in a frontal section
                               Overview
          Its suitability as an exceptionally accurate biometric 
            derives from its
              extremely data-rich physical structure
              genetic independence — no two eyes are the same
              patterns apparently stable throughout life
              physical protection by a transparent window (the 
               cornea), highly protected by internal organ of the eye 
              externally visible, so noninvasive — patterns imaged 
               from a distance
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                                 Overview
          The disadvantages to use iris as a biometric 
            measurement are
              Small target (1 cm) to acquire from a distance (about 1 
                m) 
              Moving target 
              Located behind a curved, wet, reflecting surface 
              Obscured by eyelashes, lenses, reflections 
              Partially occluded by eyelids, often drooping 
              Deforms non-elastically as pupil changes size 
              Illumination should not be visible or bright 
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  CS 790Q  Biometrics
          PART I:
          Iris Recognition: An Emerging 
          Biometric Technology
       
          R. Wildes, "Iris Recognition: An Emerging 
       Biometric Technology", Proceedings of the 
       IEEE, vol 85, no. 9, pp. 1348-1363, 1997.