Pupil centre coordinates detection using the circular Hough transform technique

This paper presents a robust technique for pupil center coordinates detection that uses the circular Hough transform technique. The algorithm of the proposed application is based on detecting the circle which represents the pupil edge from a set of eye images captured using an infrared camera which employs the dark-pupil technique. The accuracy of the pupil detection algorithm is evaluated on the basis of the pupil center positioning error for a set of 52 eye images of the same subject, with gaze oriented in all directions.