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

• Current Assignee: Wyman White
• Original Assignee: Wyman White
• Inventors: WYMAN WHITE
• Application Number:
  US04/169,454
• Time in Patent Office: 1,296 Days
• US Class Current: 356/392
• CPC Class Codes: G06V 40/12 Fingerprints or palmprints

Claims

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.