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Recently, many brutal crimes have shocked us. Therefore, the importance of security and self-defense have increased more and more. There are a method of detecting suspicious persons as one of security and self-defense. To detect suspicious persons is considered important for the office security and home security. Such conventional measurements are still carried out on manual works, but these works are very hard for the persons. Therefore it is necessary to develop an automatic method of checking suspicious persons. In this paper, we propose a method of detecting suspicious persons using the internet camera. First, an image sequence is obtained by the internet camera which is installed on a wall or ceiling as shown in Fig. 1. Next, the human region is detected by difference images as shown in Fig. 2. Then, each center of gravity of human region is detected. After decreasing noise, the movement of the person is detected by tracking these points as shown in Fig. 2. By using these images, the recognition of suspicious persons is carried out. In first step, our method classifies the target person into 3 postures: walking, staying and sitting. In next step, the system employs the subspace method which uses three fea-

Detection of Suspicious Persons using Internet Camera