A Method of Splitting Iris and Pupil under Visible Rays

Abstract

Popular gaze tracking systems and pupillometers expose eyes to near-infrared rays and detect clear images through infrared cameras based on the property that the iris reflects the near-infrared rays while the pupil does not since structure of eyeballs. Some problems are that: near-infrared rays cause users feeling thirsty; long time exposure of infrared rays may cause users cataract; and, infrared rays devices are complicated, etc. Although the best way is to split iris and pupil under visible rays, it is not easy since almost all Japanese have brown irises and black pupils while the surface of eyes reflects the surroundings sensitively. This article reports that examining a possibility of splitting iris and pupil by combining the generalized Hough transform and Fukui's edge extraction method.