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Apparatus and method for biometric identification

  • US 5,335,288 A
  • Filed: 02/10/1992
  • Issued: 08/02/1994
  • Est. Priority Date: 02/10/1992
  • Status: Expired due to Fees
First Claim
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1. Biometric measuring apparatus for recognizing a person'"'"'s identity based on measurements performed on the person'"'"'s hand, said apparatus comprising:

  • support means for supporting a portion of a person'"'"'s hand including at least a plurality of fingers in spread positions and having a predefined background image plane associated therewith;

    means for producing and storing a silhouette image of a hand portion placed on said support means, includingimage capture means for viewing said hand portion and said support means from a prearranged first direction;

    illumination means for illuminating said hand portion and said support means to present a silhouette image of said hand portion to said image capture means; and

    storage means for storing at least a portion of said silhouette image presented to said image capture means;

    means for producing and storing a structured light image of said hand portion, includingimage capture means for viewing said hand portion and said support means from a prearranged second viewing direction;

    illumination means for directing a structured light pattern onto said hand portion from a prearranged direction substantially different from said second viewing direction to present to said image capture means a structured light image comprising at least one element of said structured light pattern striking a surface region of at least one of said fingers at a position displaced from a precalibrated striking position on said background image plane in the absence of said finger, the magnitude of said position displacement providing measurement data on finger height characteristics; and

    storage means for storing at least a portion of said structure light image;

    means for analyzing said stored silhouette image and said stored structure light image to produce hand feature data, including hand feature data derived at least in part from said measurement data on finger height characteristics;

    means for storing hand enrollment data comprising said hand feature data obtained during a hand enrollment operation cycle;

    means for storing hand bid data comprising said hand feature data obtained during a hand bid operation cycle; and

    means for comparing hand bid data with hand enrollment data to decide on the basis of prearranged decision criteria whether said hand bid data and said hand enrollment data were produced by the same hand portion.

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