Mohammad Reza Mohammadi - Electrical Engineering DepartmentAmirkabir University of TechnologyTehran, Iran
Abolghasem Raie

Pupil center localization is fundamental to calculateeye orientation and gaze direction in video-based systems. Inprevious techniques, either it is assumed that the pupil center issame as iris center or active illumination is utilized. In this paper,we have developed a new technique which utilizes eye geometryto localize pupil center without requiring special lighting. Themain idea in the proposed technique is to restrict search space ofthe pupil center to the minor diameter of the iris ellipse provedfrom the geometrical model of eye proposed in this paper. In theproposed technique, we fit an ellipse to iris boundary, which isvery simpler than ellipse fitting for pupil boundary in images onthe common illumination, and then estimate pupil center bysearching minor diameter of the iris ellipse. The performance ofthe method has been evaluated on both synthetic and real images.

Pupil center localization; Projectivegeometry; Search space; Curve fitting