Abstract

An apparatus for real-time pattern comparison based on the interference method proposed by Weinberger and Almi is described. Particular emphasis is stressed on its use in fingerprint identification. Preliminary experiments confirmed that the apparatus is feasible for the purpose.

© 1974 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. H. Weinberger, U. Almi, Appl. Opt. 10, 2482 (1971).
    [CrossRef] [PubMed]
  2. A referee suggested that a similar method was described by J. F. Rau in U.S. Patent3,519,992 (1970).

1971 (1)

Almi, U.

Rau, J. F.

A referee suggested that a similar method was described by J. F. Rau in U.S. Patent3,519,992 (1970).

Weinberger, H.

Appl. Opt. (1)

Other (1)

A referee suggested that a similar method was described by J. F. Rau in U.S. Patent3,519,992 (1970).

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)

Fig. 1
Fig. 1

Principle of measurement.

Fig. 2
Fig. 2

Schematic diagram of the experimental apparatus.

Fig. 3
Fig. 3

Fraunhofer diffraction patterns of fingerprint belonging to three individuals.

Fig. 4
Fig. 4

Discrimination ratio vs combination of fingerprints.

Fig. 5
Fig. 5

Discrimination ratio vs effective area of fingerprint.

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

A ( μ , ν ) = F ( μ , ν )             exp i π b / λ f + G ( μ , ν )             exp - i π b / λ f ,
I ( μ , ν ) = A ( μ , ν ) 2 = F ( μ , ν ) 2 + G ( μ , ν ) 2 + exp 2 π i b / λ f · F ( μ , ν ) G * ( μ , ν ) + exp - 2 π i b / λ f · F * ( μ , ν ) G ( μ , ν ) ,
I ( μ ) = F ( μ , ν ) 2 d ν + G ( μ , ν ) 2 d ν + 2 cos [ 2 π b / λ f + φ ( μ ) ] F ( μ , ν ) G * ( μ , ν ) d ν ,
W ¯ = 2 d μ F ( μ , ν ) G * ( μ , ν ) d ν F ( μ , ν ) 2 d ν d μ + G ( μ , ν ) 2 d ν d μ .
W ¯ = 1 for f ( x , y ) = g ( x , y ) , W ¯ < 1 for f ( x , y ) g ( x , y ) .

Metrics