Patent ID: 7088243

Claim:
A method of intruder detection, comprising using more than one sensor, represented by cameras that are arranged with fixed spatial orientation to form a stereo detector of 2D distributions of light intensity of a surveillance zone, that form stereo images registered by said stereo detector, and transmitting the stereo images to processing blocks, for performing processing of a sequence of stereo images with different frequencies, (high and low), for determining the presence of an intruder, a position of said intruder and a speed of transference of said intruder; the determining of an intruder including comparing geometrical figures with a set of geometrical figures that were memorized in advance that describe both resolved objects and a possible intruder, and the scaling of a figure in dependence of a measured distance between the stereo detector and the object that is represented by given figure and generating an alarm signal in case of coincidence with figure of possible intruder.