METHOD OF DETERMINING AN INTRUSION INTO A MONITORED AREA AND A SYSTEM THEREFORE
First Claim
1. A method of determining an intrusion into a monitored area comprising the steps of capturing images of at least two imaging devices positioned at a deferent locations relative to said area and having overlapping fields of view covering the images of a predetermined pattern located behind said monitored area, processing the captured images to detect change in the image of the predetermined pattern to determine relative position of an object causing said change in the captured image of the predetermined pattern.
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Abstract
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.
7 Citations
13 Claims
- 1. A method of determining an intrusion into a monitored area comprising the steps of capturing images of at least two imaging devices positioned at a deferent locations relative to said area and having overlapping fields of view covering the images of a predetermined pattern located behind said monitored area, processing the captured images to detect change in the image of the predetermined pattern to determine relative position of an object causing said change in the captured image of the predetermined pattern.
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7. System for generating at least one output signal depending on the relative position of an intrusion of an optically detectible object into a monitored area, comprising at least two imaging devices spaced from the plane of said monitored area, and having fields of view covering the whole monitored area,
a predetermined optical pattern positioned essentially outside and behind said monitored area, as seen from said imaging devices, at least two mirrors directing the images of said optical patterns to said imaging devices, a processor receiving and processing image data provided by said at least two imaging devices to detect any optical change caused by the intrusion of said object into said monitored area and to determine the position of said intrusion causing optical change within said predetermined area, an output signal generator for generating at least one output signal depending on the relative position of said intrusion into said monitored area.
Specification