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Also, specular reflections can occur within the iris region corrupting the iris pattern.
Images in the CASIA iris database [13] do not contain specular reflections due to the use of near infra-red light for illumination.
However, the images in the LEI database [14] contain these specular reflections, which are caused by imaging under natural light.
Specular reflections along the eye image are detected using thresholding, since the intensity values at these regions will be higher than at any other regions in the image.
Figure 2.2 - Stages of segmentation with eye image 'pi201b' from the LEI database Top left) original eye image Top right) two circles overlayed for iris and pupil boundaries, and two lines for top and bottom eyelid Bottom left) horizontal lines are drawn for each eyelid from the lowest/highest point of the fitted line Bottom right) probable eyelid and specular reflection areas isolated (black areas)
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