A hybrid eye-tracking method using a multispectral camera

In this paper, we propose a novel eye-tracking method that uses a multispectral camera to simultaneously track the pupil and recognize the iris. Our hybrid approach leverages existing methods, combining them so as to compensate for weaknesses present in each individual method when used alone. Significantly, our method allows for movements of the center of rotation of the eye to be taken into consideration, this having been treated as a static point in most of earlier studies. Additionally, our method allows for the diameter of the pupil to be measured quantitatively using just a single camera. To confirm the effectiveness of our method, we conduct two experiments, in which we estimate the area and shape of the iris, the point-of-gaze, and the size of the pupil. We go on to observe that the effectiveness of our proposed method is increased compared to previous methods, particularly in situations where the eye is moved to the extreme inner corner of its socket.