1 Department of Electrical Engineering, Technical University of Denmark2 Technical University of Denmark3 Copenhagen Center for Health Technology, Center, Technical University of Denmark
This paper concerns automatic video surveillance of outdoor scenes using a single camera. The first step in automatic interpretation of the video stream is activity detection based on background subtraction. Usually, this process will generate a large number of false alarms in outdoor scenes due to e.g. movement of thicket and changes in illumination. To reduce the number of false alarms a Track Before Detect (TBD) approach is suggested. In this TBD implementation all objects detected in the background subtraction process are followed over a number of frames. An alarm is given only if a detected object shows a pattern of movement consistent with predefined rules. The method is tested on a number of video sequences and a substantial reduction in the number of false alarms is demonstrated.
Proceedings of Spie: Sensors, and Command, Control, Communications, and Intelligence, 2005, p. 684-691
Main Research Area:
Sensors, and Command, Control, Communications, and Intelligence, 2005
SPIE - International Society for Optical Engineering