Community Research and Development Information Service - CORDIS

Abstract

There are situations where video surveillance based on automated scene change detection systems may prove to be ineffective. In some cases, the changes in the image are too small to be properly detected. In others, false alarms are generated without objects moving, caused by changes in illumination, i.e. faulty lamps or spurious reflections in places near water pools. The absence of illumination during blackouts prevents cameras from their surveillance operation. There are high security installations for which it is necessary to introduce reliable, independent and effective sensors that can keep the surveillance work even during blackouts.

Laser range scanners are electronic instruments measuring the distance from the instrument itself to the outside world along a specific direction. The type of the instrument to use depends on the range of distances to measure. The deflection of the laser beam (e.g., using a rotating mirror) enables the acquisition of the distance profiles of the surrounding premises in a very short time. Alarms are generated by comparing acquired distance measurements (organized as profiles-2D laser surveillance, or in clouds of points -3D laser surveillance) with previously acquired references. This is most effective for real-time detection of even small changes in the environment.

The main feature of laser surveillance system is that it measures distances between the instrument itself and the real world, rather than measuring only appearance as video surveillance systems do. As such any physical change occurring within the field of site of the laser instrument is immediately measured and detected. The fact that laser systems are self-illuminating and do not depend on the external illumination makes them quite effective to work during blackouts. ts.

Additional information

Authors: GONÇALVES J G M, JRC, ISIS, Ispra (IT);SEQUEIRA V, JRC, ISIS, Ispra (IT);WHICHELLO J, IAEA, Vienna (AT);GONCALVES J G M, JRC, ISIS, Ispra (IT)
Bibliographic Reference: An oral report given at: The Symposium on International Safeguards. Held in: Vienna (AT), 29 October - 2 November 2001
Record Number: 200114096 / Last updated on: 2001-11-23
Category: PUBLICATION
Original language: en
Available languages: en