Abstract

We describe a technique for reducing false signals from optical correlators using binary phase-only filters (BPOF's). Since the impulse-response function of the BPOF contains both the target object and the inverted version of it, the output consists of the correlation of the input object with both of these objects. In our research a Fresnel phase plate lens is encoded onto the BPOF. As a result the correlation with the desired target is on a converging beam, and the correlation with the undesired inverted image of the target is on a diverging beam. Experimental results show that these filters reject inverted input objects.

© 1989 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. J. L. Horner, J. R. Leger, Appl. Opt. 24, 609 (1985).
    [CrossRef] [PubMed]
  2. D. Psaltis, E. G. Paek, S. S. Venkatesh, Opt. Eng. 23, 698 (1984).
  3. D. L. Flannery, A. M. Biernacki, J. S. Loomis, S. L. Cartwright, Appl. Opt. 25, 466 (1986).
    [CrossRef] [PubMed]
  4. W. E. Ross, D. Psaltis, R. H. Anderson, Opt. Eng. 22, 485 (1983).
  5. D. M. Cottrell, R. A. Lilly, J. A. Davis, T. Day, Appl. Opt. 26, 3755 (1987).
    [CrossRef] [PubMed]
  6. J. A. Davis, G. W. Bach, D. M. Cottrell, R. A. Lilly, Appl. Opt. 27, 2949 (1988).
    [CrossRef] [PubMed]
  7. J. A. Davis, D. M. Cottrell, G. W. Bach, R. A. Lilly, Appl. Opt. 28, 258 (1989).
    [CrossRef] [PubMed]
  8. J. A. Davis, D. M. Cottrell, R. A. Lilly, S. W. Connely, Opt. Lett. 14, 420 (1989).
    [CrossRef] [PubMed]
  9. J. A. Davis, M. A. Waring, G. W. Bach, R. A. Lilly, D. M. Cottrell, Appl. Opt. 28, 10 (1989).
    [CrossRef] [PubMed]

1989

1988

1987

1986

1985

1984

D. Psaltis, E. G. Paek, S. S. Venkatesh, Opt. Eng. 23, 698 (1984).

1983

W. E. Ross, D. Psaltis, R. H. Anderson, Opt. Eng. 22, 485 (1983).

Anderson, R. H.

W. E. Ross, D. Psaltis, R. H. Anderson, Opt. Eng. 22, 485 (1983).

Bach, G. W.

Biernacki, A. M.

Cartwright, S. L.

Connely, S. W.

Cottrell, D. M.

Davis, J. A.

Day, T.

Flannery, D. L.

Horner, J. L.

Leger, J. R.

Lilly, R. A.

Loomis, J. S.

Paek, E. G.

D. Psaltis, E. G. Paek, S. S. Venkatesh, Opt. Eng. 23, 698 (1984).

Psaltis, D.

D. Psaltis, E. G. Paek, S. S. Venkatesh, Opt. Eng. 23, 698 (1984).

W. E. Ross, D. Psaltis, R. H. Anderson, Opt. Eng. 22, 485 (1983).

Ross, W. E.

W. E. Ross, D. Psaltis, R. H. Anderson, Opt. Eng. 22, 485 (1983).

Venkatesh, S. S.

D. Psaltis, E. G. Paek, S. S. Venkatesh, Opt. Eng. 23, 698 (1984).

Waring, M. A.

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 (3)

Fig. 1
Fig. 1

Diagram of the short experimental correlator.

Fig. 2
Fig. 2

Input pattern consisting of two R's.

Fig. 3
Fig. 3

Output intensity from a linear-diode array detector. (A) The conventional correlator output using the BPOF; note that both the letter and the inverted version from Fig. 2 are recognized. (B) The correlator output using the Fresnel lens-encoded BPOF of expression (2); note that only the upright letter is recognized. (C) The correlator output using the Fresnel lens-encoded BPOF of Eq. (4); note that only the inverted letter is recognized.

Equations (6)

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

½ BIN [ G ( u , υ ) + G * ( u , υ ) ] ,
½ [ g ( x , y ) + g ( x , y ) ] ,
Z 1 * = exp [ i 2 π ( u 2 + υ 2 ) 2 z λ ] ,
T ( u , υ ) = Z 1 * G * ( u , υ ) .
T ( u , υ ) = ½ BIN [ Z 1 * G * ( u , υ ) + Z 1 G ( u , υ ) ] .
T ( u , υ ) = Z 1 * G ( u , υ ) .

Metrics