Surveillance arrangements

Details Surveillance arrangements Surveillance arrangements

G - Physics

01

S

350/31, 350/32,

G01S 3/784 (2006.01)

Patent

CA 1079394

IMPROVEMENTS IN OR RELATING TO SURVEILLANCE ARRANGEMENTS ABSTRACT OF THE DISCLOSURE A surveillance system is disclosed comprising a number of infra-red detectors in an array each arranged to view a different portion of a field of view, and a threshold detector provided in the output path of each infra-red detector. Each threshold detector is arranged to have a threshold level which is dependent upon the output signal levels of adjacent detectors in the array.

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