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Video alarm systems

  • US 4,198,653 A
  • Filed: 04/03/1978
  • Issued: 04/15/1980
  • Est. Priority Date: 04/04/1977
  • Status: Expired due to Term
First Claim
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1. In an alarm system for discriminating a video signal produced by a television camera for detecting a movement or a change in a scene which is under surveillance by the television camera, the alarm system comprising means for subdividing the television picture corresponding to the video signal into a plurality of areas, and evaluation means for individually evaluating the respective video signals corresponding to those areas according to predetermined criteria, the improvement comprising means for detecting a video signal change originating from a predetermined brightness change in a selected picture area of adjustable size and position, and means for suppressing any alarm initiated in respect of at least one remaining area of the television picture when said predetermined brightness change is detected.

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