H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/32
H04N 7/18 (2006.01) G08B 13/194 (2006.01) G08B 13/196 (2006.01)
Patent
CA 1142638
VIDEO MONITORING SYSTEM AND METHOD Abstract of the Disclosure A television system and method are disclosed for monitoring and indicating changes in a scene from which electromagnetic radiation, such as visible light, emanates. A television system including a television camera scans the scene in known raster fashion in a series of image frames, producing an amplitude modulated video signal describing the energy intensity distribution of the scene. Clocking and gating circuitry triggered in synchronism with television camera synchronization signals defines a set of predeter- mined discrete spaced locations of the raster during each image frame and samples video signal amplitude at each of the defined locations. The same discrete locations are sampled during each frame. Video selection circuitry, during a succession of sampling periods, inputs in real time a representation of each video amplitude sample to one of several storage channels of a multi-channel memory system including a multi-channel counter. The video amplitude samples are allocated among the channels as a function of their amplitude values. Subsequently, comparison circuitry, in response to the development of a subsequent amplitude distribution profile, corresponding to a selected later frame, actuates an alarm in response to the occurrence of a predetermined threshold difference between (1) the earlier and (2) a succession of later developed amplitude distribution profiles.
348180
Loughry H. Hampton
Zeewy Abraham
Ham Industries Inc.
Ridout & Maybee Llp
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