Development of non-contact interface based on eyelid shape and iris position

Abstract

This paper describes a new method of operating the welfare support equipment with gazing input. User's face was observed by the USB camera, and it was taken to the control computer to recognize the user's gazing directions. Gazing points with respect to right or left directions could be recognized by the relative distance of an iris and the outer corner of left and right eyes. Upward and downward gazing direction were judged by the curvature of the eyelid shape which was approximated by the Bezier curve. As the gazing point became lower than the height of the camera, the curvature value of the approximation curve was decreased because the eyelid shape roughly became linear. In the test trial, it could be confirmed that the developed system could recognize the user's gazing directions with non-contact state.