Increasing precision of pupil position detection using the corneal reflection

Abstract

In general, the relative position between the centers of the pupil and corneal reflection are used for precise eye-gaze detection. Recently, for stable pupil detection under various ambient light conditions, the pupil has been detected by the difference between the bright and dark pupil images. However, due to the difference in acquisition timing between the bright and dark images, the precision of the pupil position easily decreases when the head moves. We propose a compensation method which differentiates those pupil images after shifting one of the images so that the positions of corneal reflections in both images should match. and show its effectiveness.