On Full-View Area Coverage by Rotatable Cameras in Wireless Camera Sensor Networks

The paper addresses an area coverage problem by using rotatable cameras in wireless camera sensor networks. It has been recognized as an important issue not only to effectively cover an area of interest without holes but also to identify the object invaded the area by cameras in wireless camera sensor networks. Therefore, this paper presents a Full-View Area Coverage (FVAC) scheme to effectively deploy rotatable camera sensors and tune their directions such that not only the area can be covered completely but also the object can be identified. In FVAC, the sizes of safe and unsafe regions with effective angle are derived. Moreover, a grid deployment model is investigated to deploy and rotate the camera sensors in accordance with the safe and unsafe regions in order not only to cover the area but also to identify the object. The grid size, that is, the distance among camera sensors, is also derived according to the effective angle and the sensing radius of camera sensors. Performance results show that the proposed scheme can reduce the number of deployed camera sensors and successfully identify objects against the related work in cases of a small effective angle or a short sensing radius.