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Method for optical comparison of skin friction-ridge patterns

  • US 3,200,701 A
  • Filed: 01/29/1962
  • Issued: 08/17/1965
  • Est. Priority Date: 01/29/1962
  • Status: Expired due to Term
First Claim
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1. A METHOD FOR COMPARING THE FRICTTION-RIDGE PATTERN OF A PORTION OF SKIN WITH A REFERENCE FRICTION-RIDGE PATTERN COMPRISING:

  • PRODUCING AN OPTICAL IMAGE OF THE FRICTION-RIDGE PATTERN DIRECTLY FROM SKIN CONTAINING THE FRICTION-RIDGE PATTERN;

    PROJECTING THE OPTICAL IMAGE ON A SCREEN;

    SERIALLY PERFORMING A PLURALITY OF SCANNING OPERATIONS OF DIFFERENT TYPES ON THE OPTICAL IMAGE THEREBY PRODUCING A FIRST PLURALITY OF ELECTRICAL SIGNALS DIRECTLY REPRESENTATIVE OF THE OPTICAL IMAGE;

    GENERATING A SECOND PLURALITY OF ELECTRICAL SIGNALS DIRECTLY REPRESENTATIVE OF THE REFERENCE FRICTION-RIDGE PATTERN AND EACH CORRESPONDING TO THE DIFFERENT TYPES OF SCANNING OPERATIONS;

    PERFORMING A SERIES OF COMPARISONS IN EACH OF WHICH A RESPECTIVE ONE A SERIES OF COMPARISONS IN EACH OF WHICH A RESPECTIVE ONE OF THE FIRST PLURALITY OF ELECTRICAL SIGNALS IS COMPARED WITH A RESPECTIVELY CORRESPONDING ONE OF THE SECOND PLURALITY OF ELECTRICAL SIGNALS;

    PRODUCING A PLURALITY OF ELECTRICAL SIGNALS EACH OF WHICH IS INDICATIVE OF THE RESULTS OF A RESPECTIVE ONE OF SAID COMPARISONS AND WHICH IS AFFIRMATIVE WHEN SAID RESULTS ARE INDICATIVE OF IDENTITY BETWEEN THE FRICTION-RIDGE PATTERN AND REFERENCE FRICTION-RIDGE PATTERN;

    AND. UPON AT LEAST TWO O THE LAST-NAMED SIGNALS BEING AFFIRMATIVE, PRODUCING A SIGNAL INDICATIVE OF IDENTITY BETWEEN THE FRICTION-RIDGE PATTERN AND REFERENCE FRICTIONRIDGE PATTERN.

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