I. Introduction
In [1], a security guard system is reported on for buildings which utilize an autonomous mobile guard robot. The guard robot is a wheel-type autonomous robot which moves on a planned path, always alert for anything unusual from moving objects or fire to leaking water. The robot is equipped with cameras and while patrolling it, sends images back to the monitoring station. After it finishes patrolling, the robot can automatically return to and dock in a battery recharging station. The intelligent automation laboratory of National Chung Cheng University, Taiwan [2] is also developing a security robot. This robot has five sensory subsystems: fire detection, intruder detection, motor diagnosis, obstacle detection, and environment detection. The client user can supervise these sensory signals through the Internet. Both desktop PCs and personal digital assistants (PDAs) can be used as the user interface for remote surveillance and control system. These security robot systems can increase the security of our homes and offices.