Remote Eye-gaze Tracking System by One-point Gaze Calibration

Abstract

Conventional gaze tracking systems are burdensome in that they require the user to gaze at several targets on the PC screen in the user-calibration process. The proposed calibration procedure requires the user to gaze at only one target. The implemented system consists of four camera-calibrated, wide-view video cameras arranged around the screen, with near-infrared light-emitting diode (LED) lights attached to each camera. The angle θ between the line of sight and the line connecting the center of the pupil and the camera (LED lights) is related to the vector from the center of the pupil to the corneal reflection detected from the video image. The user-calibration process makes it possible to determine three parameters, which can be achieved using three of the four cameras. Usually, the larger that angle θ is, the worse the gaze detection precision is. A weighted mean method is proposed to determine the final precise gaze point.