How fingerprint scanners work
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How fingerprint scanners work

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How fingerprint scanners work How fingerprint scanners work Presentation Transcript

  • How Fingerprint Scanners Work BY: ZOË FRATI
  • What are Fingerprints? People have tiny ridges of skin on their fingers They help the fingers grip things, like the rubber thread pattern on a tire help grip the road There is no chance that the same exact pattern forming twice
  • What does a Fingerprint Scanner Do? It has two basic jobs It first gets an image of the person’s finger Then it needs to match the pattern of the ridges and valleys in that imagine with an the pattern of a pre- scanned images. View slide
  • How do you get an Image of a Somebody’s Finger? The two most common methods are Optical Scanning Capacitance Scanning View slide
  • Optical Scanning It starts when a person places their finger on a glass plate, and a CCD (Charged Coupled Device) camera takes a picture. The CCD system generates an inverted image of the finger with darker areas representing the ridges of the finger and lighter areas representing the valleys between the ridges.
  • Optical Scanning Cont. After it proceeds to comparing the captured fingerprint with fingerprints on file.
  • Capacitive Scanner It starts out like an optical scanner but instead of sensing the print using light, it uses an electrical current. A finger ridge will result in a different voltage output then a finger valley. The scanner processor will put together an overall picture of the finger print
  • Sites http://computer.howstuffworks.com/fingerprint- scanner1.htm http://fingerprint-security.net/wp- content/uploads/2011/09/laptop-fingerprint- scanner.jpg http://www.pacificgeek.com/productimages/xl/DG2 -00002.jpg