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System for determining the number of shoppers in a retail store and for processing that information to produce data for store management

  • US 5,138,638 A
  • Filed: 01/11/1991
  • Issued: 08/11/1992
  • Est. Priority Date: 01/11/1991
  • Status: Expired due to Term
First Claim
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1. A system for automatically counting people or objects as they move past a selected location, and for measuring their heights, said system comprising:

  • means for emitting beams toward a person or object moving past a selected location to generate reflected beams from said person or object, the included angle of an emitted and reflected beam being a function of the height of the person or object;

    position detecting means for detecting said reflected beams and generating signals that vary in response to the positions at which the reflected beams strike the detecting means, said signals thereby being representative of the included angle and thereby representing a height profile of the person or object from which the beams are reflected; and

    means for converting said signals to data representing the number of persons or objects in a selected category.

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