Research of Gaze Point Compensation Method in Eye Tracking System

In order to improve the precision of remote eye tracking system, we propose an arc length compensation algorithm for gaze point which is based on the algorithm of gaze point with double light source in space similar triangles. First is the analysis of the influence of ocular cornea surface to the deviation of gaze point, according to the human eyeball physiological model and visual features, we presented to employ the plane triangle whose sides are the arc length of ocular cornea to compensate the gaze point. Then we got the final gaze point benefited from the further compensation using the nonlinear polynomial model to fit the deviation between the eye visual axis and optical axis. The result of our experiment shows that the deviation of this method is less than 1 centimeter both in horizontal and vertical directions and the effectiveness of the method.