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In this paper, we propose a three-dimensional position detection method for moving object using multiple HyperOmni Visions (HOVIs) and a new surveillance system for old person living alone based on the proposed method. The system consists of some HOVIs and an active camera. The system detects the position of a person using HOVIs. When the person stops, the active camera shoots the person’s image and the system recognizes the person’s conditions. Experimental results showed the feasibility of this system.