I. Introduction

The Internet has become an important part of our daily lives. Personal computers can be used to easilly get a lot of information and communicate between family and friends. Among users, disabled persons are interested in accessing multimedia on the Internet. Therefore, the Internet is essential technology for disable persons to improve their Quality Of Life (QOL). A mouse is usually used as a computer interface to select icons on a display and execute programs by clicking the mouse button. As a result, the ability to use a mouse is important to disabled persons. However, as hand operation is needed to control a conventional mouse, disabled persons may not use the mouse easily. It is necessary to develop new input devices instead of a hand-operated mouse. Several types of mouse for disabled persons have been devised. For example, Dmitry et.al. developed a mouse device using vision-based technology [1]. The mouse cursor position could be controlled by multiple eye blinks and nose movement was used for clicking operation. However, it was sensitive to external disturbance, such as the brightness of the room and users' movements.