METHOD OF DETERMINING AN INTRUSION INTO A MONITORED AREA AND A SYSTEM THEREFORE

摘要

A method of determining an intrusion into a monitored area comprises the evaluation of images of specific optical pattern (40) arranged behind said monitored area. The system comprises at least two imaging devices (20) spaced from the plane of said monitored area; a predetermined optical pattern (40) positioned outside and behind said monitored area; at least two mirror (30) directing the images of said optical patterns (40) to said imaging devices (20); a processor receiving and processing image data provided by said at least two imaging devices (20) to detect any optical change and to determine the position of an intrusion causing optical change within said predetermined area; an output signal generator for generating an output signal depending on the relative position of said intrusion.