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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 35 — Dec. 10, 2008
  • pp: 6594–6600

Hyperspectral imaging-based credit card verifier structure with adaptive learning

Sarun Sumriddetchkajorn and Yuttana Intaravanne  »View Author Affiliations

Applied Optics, Vol. 47, Issue 35, pp. 6594-6600 (2008)

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We propose and experimentally demonstrate a hyperspectral imaging-based optical structure for verifying a credit card. Our key idea comes from the fact that the fine detail of the embossed hologram stamped on the credit card is hard to duplicate, and therefore its key color features can be used for distinguishing between the real and counterfeit ones. As the embossed hologram is a diffractive optical element, we shine a number of broadband light sources one at a time, each at a different incident angle, on the embossed hologram of the credit card in such a way that different color spectra per incident angle beam are diffracted and separated in space. In this way, the center of mass of the histogram on each color plane is investigated by using a feed-forward backpropagation neural-network configuration. Our experimental demonstration using two off-the-shelf broadband white light emitting diodes, one digital camera, and a three-layer neural network can effectively identify 38 genuine and 109 counterfeit credit cards with false rejection rates of 5.26% and 0.92%, respectively. Key features include low cost, simplicity, no moving parts, no need of an additional decoding key, and adaptive learning.

© 2008 Optical Society of America

OCIS Codes
(090.5640) Holography : Rainbow holography
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(330.1730) Vision, color, and visual optics : Colorimetry
(150.1708) Machine vision : Color inspection
(110.4234) Imaging systems : Multispectral and hyperspectral imaging
(100.4996) Image processing : Pattern recognition, neural networks

ToC Category:

Original Manuscript: July 1, 2008
Revised Manuscript: September 27, 2008
Manuscript Accepted: September 28, 2008
Published: December 5, 2008

Sarun Sumriddetchkajorn and Yuttana Intaravanne, "Hyperspectral imaging-based credit card verifier structure with adaptive learning," Appl. Opt. 47, 6594-6600 (2008)

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