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Automatic security monitor reporter

  • US 5,455,561 A
  • Filed: 08/02/1994
  • Issued: 10/03/1995
  • Est. Priority Date: 08/02/1994
  • Status: Expired due to Fees
First Claim
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1. A surveillance system for keeping an area under surveillance for detecting breaches of safety and security, comprising:

  • a video camera, said video camera being capable of producing an electronic depiction of the area under surveillance, said electronic depiction being in the form of a series of frames transmitted over time;

    a frame recorder electronically connected to said video camera to receive said series of frames transmitted from said video camera, said frame recorder storing at least one frame from said series of frames as a reference frame;

    means for generating an analog difference signal between said reference frame and at least one subsequent frame from said series of frames; and

    a change detector for determining the number of frames in said series of frames in which said analog difference signal exceeds a preset threshold during a preprogrammed time interval immediately following the storing of said reference frame, said change detector generating an alarm condition when said number of frames exceeds a preprogrammed value, and said change detector generating a signal to store a new reference frame in said frame recorder when said number of frames does not exceed said preprogrammed value.

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