Event-based Cooperative Target Tracking by 2-level Hierarchical PTZ Camera Sensor Networks

In recent years, there has been considerable interest in Camera Sensor Networks (CSNs) as the next-generation monitoring systems due to their ability of processing large amount of data. In this paper, we propose a 2-level hierarchical architecture for tracking multiple targets using Pan-Tilt-Zoom (PTZ) cameras. In this method, each camera can track moving targets by local communications with other cameras and the global communication with a coordinator which assigns a camera to a target to be monitored. The camera assignment problem is formulated by a 0-1 integer programming problem. In order to reduce the computational load of the camera assignment problem, we consider an event-triggered method where the coordinator assigns cameras only when they fail to track the current targets. We conduct a simulation to show that the proposed method successfully achieves multiple tracking.