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Method and system for guarding a person in a building

  • US 8,026,820 B2
  • Filed: 12/04/2006
  • Issued: 09/27/2011
  • Est. Priority Date: 12/09/2005
  • Status: Active Grant
First Claim
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1. A method for guarding one or more persons inside a building, the method comprisingdirecting, by means of at least two motion detectors fastened to the building, into a room being monitored at least two non-superimposed beams, at least one of which extends in a width of at most dozens of centimeters across the room being monitored;

  • detecting the movement of each person at least at two separate locations defined by the beams;

    observing the movement of each person by means of the detections in a predefined time without raising an alarm, if the detected locations of the person form a line of predefined consecutive locations from a predefined initial location to a predefined destination location;

    raising an alarm if this is not the case; and

    raising an alarm if the person being monitored is not detected twice successively at the destination location.

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