Development of Operational Interface Using Approximation of Eyelid Shape
Nobuaki NAKAZAWA, Shin-nosuke Segawa, Hiroki Murakawa, Toshikazu Matsui · Journal of Life Support Engineering · 2015
This paper describes a new method of operating the page turner machine 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. The states of gazing the camera and reading a book 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. The proposed recognition system was applied to the operations of the page turner machine. In the test trial, it could be confirmed that the developed system could recognize the user's intention, and the subjects were consequently able to operate the page turner machine by only gazing input with non-contact.