A. Goradia, Z. Cen et.al. 1 Pervasive Surveillance Networks: Design, Implementation and Performance Analysis

Pervasive surveillance implies the continuous tracking of multiple targets as they move about the monitored region. The tasks to be performed by a surveillance system have the following requirements: (1) track the identified targets automatically over the region being monitored; (2) allow tele-control of active sensors to follow operator commands; (3) provide concise feedback and video data of a tracked target to multiple operators. The active sensors needed to track the target keep changing due to target motion. Hence in order to provide concise and relevant information to a human operator to assist in decision making, the video feedback provided to the operator needs to be switched to the sensors currently involved in the tracking task. Another important aspect of surveillance systems is the ability to track multiple targets simultaneously using sensors with motion capability. Current feature (point) based visual surveillance and tracking techniques generally employed do not provide an adequate framework to express the surveillance task of tracking multiple targets simultaneously using a single sensor. This paper presents the method of Hausdorff tracking, which can express the surveillance task succinctly and also track multiple targets simultaneously using a single sensor. Tele-control of the active sensors allow the human operator to task the sensors for performing tasks that were not planned apriori. However tele-control over time-delayed networks suffers from the stability problem. This paper presents the method of event based active media synchronization to alleviate the instability and loss of synchronization caused by the random communication time delay. A surveillance testbed has been designed based on these requirements. Various implementations o