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Security system for notification of an undesired condition at a monitored area with minimized false alarms

  • US 6,493,022 B1
  • Filed: 03/05/1999
  • Issued: 12/10/2002
  • Est. Priority Date: 03/05/1999
  • Status: Expired due to Term
First Claim
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1. A method for notifying at least one security post of an undesired condition at a monitored area, the method including the steps of:

  • A. creating a first image of said monitored area at a first time point, said first image divided into a plurality of first image blocks using a predefined grid;

    B. creating a second image of said monitored area at a second time point, said second image divided into a plurality of second image blocks using said predetermined grid;

    C. comparing a said first image block with a corresponding said second image block by performing the steps of calculating a first average pixel value of said first image block;

    calculating a second average pixel value of said corresponding second image block;

    calculating a first standard deviation pixel value of said first image block;

    calculating a second standard deviation pixel value of said corresponding second image block;

    calculating a first x-coordinate pixel massive center of said first image block;

    calculating a second x-coordinate pixel massive center of said corresponding second image block;

    calculating a first y-coordinate pixel massive center of said first image block;

    calculating a second y-coordinate pixel massive center of said corresponding second image block; and

    D. sending a fax of said second image to said at least one security post if said corresponding second image block is substantially different from said first image block, wherein said first image block is substantially different from said corresponding second image block if said first average pixel value is substantially different from said second average pixel value or if said first standard deviation pixel value is substantially different from said second standard deviation pixel value or if said first x-coordinate pixel massive center is substantially different from said second x-coordinate pixel massive center or if said first y-coordinate pixel massive center is substantially different from said second ycoordinate pixel massive center.

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