Obstacle-detecting apparatus

  • US 5,331,312 A
  • Filed: 08/07/1992
  • Issued: 07/19/1994
  • Est. Priority Date: 08/23/1991
  • Status: Expired due to Fees
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First Claim
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1. An obstacle-detecting apparatus comprising:

  • a video camera for producing images of a crossing zone;

    image storing means having memory sufficient to store first image data based upon multiple images of said crossing zone produced by said video camera;

    first means for setting dimensions of the crossing zone in which an object is to be detected;

    second means for setting dimensions of a detection area within said crossing zone;

    third means for setting background image data of said crossing zone based upon said first image data stored in said image storing means;

    means for comparing said first image data with said background image data;

    means, responsive to said first means for setting, for determining whether an object is located within said crossing zone based upon an output of said means for comparing;

    fourth means for setting background data about the state of said crossing zone;

    means for detecting whether a rod of a crossing gate associated with said crossing zone is up or down by comparing a portion of the first image data relating to said detection area and said background data set by said fourth means; and

    means for outputting an alarm responsive to (a) a detection by said means for detecting that said rod is down and (b) a determination by said means for determining that an object is within said crossing zone.

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