The existing systems use the ideal eye images with less occluding parts for their testing. However the real time image of the eye can be captured with a lot of occluding parts, the effect of such occluding parts may result in the false non-matching. Some of the problems are outlined below,
• Eyelids and eyelashes bring about some edge noises and occlude the effective regions of the iris. This may lead to the inaccurate localization of the iris, which results in the false non-matching.
• The corneal and specular reflections will occur on the pupil and iris region. When the reflection occurs in the pupil from iris pupil border, the detection of the inner boundary of the iris fails.
• The orientation of the head with the camera may result in the orientation of the iris image to some extent.