In this paper, motion detection with the webcam can determine current conditions around mobile computers, which act accordingly with a variety of response methods. A good balance is achieved between sensitivity of machines and experiences of users. Many practical applications are investigated, and this paper is primarily focused on two main points: user-friendly operations and security. Our system provides dynamic detection features for suspicious objects: photos of suspected thieves are taken, saved, and uploaded to the Internet, and when necessary, warning Short Message Service messages are sent to mobile phone users. Apart from this application, many other applications are feasible, for example, connection of alternative current power cords of laptops can be used to determine whether they are at a risk of being stolen.

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