Eye tracking based on ultrasonic position measurement in head free video-based eye-gaze detection

We are developing a head free video-based eye-gaze detection system. In the present study, a recently developed ultrasonic head tracking system is used to keep capturing eye image in focus with zoom-focus control and one-mirror rotation systems which we previously developed. The experimental results show that the proposed total system makes it possible to detect the eye's feature points necessary for determining the eye gaze, even if the head moves back and forth or right and left, relatively fast.