Abstract

We report on the investigation of a new compact configuration of an inverted VanderLugt-type correlator system. The phase of the Fourier transform of the image to be recognized is displayed on a phase-modulating electrically addressed spatial light modulator. This phase display is compared with the phase of the Fourier transforms of a reference library recorded in a photorefractive LiNbO3 crystal. Angular hologram multiplexing permits fast data access, and the use of the conjugated replica of the stored templates leads to an elimination of phase distortions introduced by the optical system. With such a configuration, the correlator is fully shift invariant in spite of the photorefractive crystal thickness and has good discrimination with sharp correlation peaks.

© 1997 Optical Society of America

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References

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  10. D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

1996 (1)

M. Duelli, R. S. Cudney, and P. Günter, Opt. Commun. 123, 49 (1996).
[CrossRef]

1994 (2)

C. Alves, P. Aing, G. Pauliat, and G. Roosen, Opt. Mem. Neural Networks 3, 167 (1994).

E. Ahouzi, J. Campos, K. Chalasinska-Macukow, and M. J. Yzuel, Opt. Commun. 110, 27 (1994).
[CrossRef]

1993 (1)

G. Paul-Hus and Y. Sheng, Opt. Eng. 32, 2165 (1993).
[CrossRef]

1991 (1)

1990 (1)

1989 (1)

1984 (1)

Ahouzi, E.

E. Ahouzi, J. Campos, K. Chalasinska-Macukow, and M. J. Yzuel, Opt. Commun. 110, 27 (1994).
[CrossRef]

Aing, P.

C. Alves, P. Aing, G. Pauliat, and G. Roosen, Opt. Mem. Neural Networks 3, 167 (1994).

Alves, C.

C. Alves, P. Aing, G. Pauliat, and G. Roosen, Opt. Mem. Neural Networks 3, 167 (1994).

Budgett, D. M.

D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

Campos, J.

E. Ahouzi, J. Campos, K. Chalasinska-Macukow, and M. J. Yzuel, Opt. Commun. 110, 27 (1994).
[CrossRef]

Chalasinska-Macukow, K.

E. Ahouzi, J. Campos, K. Chalasinska-Macukow, and M. J. Yzuel, Opt. Commun. 110, 27 (1994).
[CrossRef]

Chatwin, C. R.

D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

Collings, N.

A. Pourzand, S. Favre, and N. Collings, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 3.5.

Cudney, R. S.

M. Duelli, R. S. Cudney, and P. Günter, Opt. Commun. 123, 49 (1996).
[CrossRef]

Duelli, M.

M. Duelli, R. S. Cudney, and P. Günter, Opt. Commun. 123, 49 (1996).
[CrossRef]

Fainman, Y.

Favre, S.

A. Pourzand, S. Favre, and N. Collings, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 3.5.

Ford, J. E.

Gianino, P. D.

Günter, P.

M. Duelli, R. S. Cudney, and P. Günter, Opt. Commun. 123, 49 (1996).
[CrossRef]

Hassebrook, L.

Horner, J. L.

Lee, S. H.

Ma, J.

Neifeld, M. A.

Paul-Hus, G.

G. Paul-Hus and Y. Sheng, Opt. Eng. 32, 2165 (1993).
[CrossRef]

Pauliat, G.

C. Alves, P. Aing, G. Pauliat, and G. Roosen, Opt. Mem. Neural Networks 3, 167 (1994).

Pourzand, A.

A. Pourzand, S. Favre, and N. Collings, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 3.5.

Psaltis, D.

Roosen, G.

C. Alves, P. Aing, G. Pauliat, and G. Roosen, Opt. Mem. Neural Networks 3, 167 (1994).

Sasaki, H.

Scott, B. F.

D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

Sharp, J. H.

D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

Sheng, Y.

G. Paul-Hus and Y. Sheng, Opt. Eng. 32, 2165 (1993).
[CrossRef]

Taketomi, Y.

Tang, P. C.

D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

Vijaya Kumar, B. V. K.

Watson, I. A.

D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

Yamamura, A.

Yang, R. C. D.

D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

Yzuel, M. J.

E. Ahouzi, J. Campos, K. Chalasinska-Macukow, and M. J. Yzuel, Opt. Commun. 110, 27 (1994).
[CrossRef]

Appl. Opt. (2)

Opt. Commun. (2)

E. Ahouzi, J. Campos, K. Chalasinska-Macukow, and M. J. Yzuel, Opt. Commun. 110, 27 (1994).
[CrossRef]

M. Duelli, R. S. Cudney, and P. Günter, Opt. Commun. 123, 49 (1996).
[CrossRef]

Opt. Eng. (1)

G. Paul-Hus and Y. Sheng, Opt. Eng. 32, 2165 (1993).
[CrossRef]

Opt. Lett. (2)

Opt. Mem. Neural Networks (1)

C. Alves, P. Aing, G. Pauliat, and G. Roosen, Opt. Mem. Neural Networks 3, 167 (1994).

Other (2)

A. Pourzand, S. Favre, and N. Collings, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 3.5.

D. M. Budgett, J. H. Sharp, P. C. Tang, R. C. D. Yang, I. A. Watson, C. R. Chatwin, and B. F. Scott, in Topical Meetings Digests Series: Optics and Information (European Optical Society, Mulhouse, France, 1995), paper 2.2.

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Figures (3)

Fig. 1
Fig. 1

Experimental setup of the phase-only correlator system: BS’s, beam splitters; SF’s, spatial filters consisting of a 20× microscope objective and a 10-µm pinhole; M’s mirrors, L1, L2, lenses; f’s, 200 mm; PS, point stop, with diameter µm; FFT, fast Fourier transformer; c, direction of the c axis.

Fig. 2
Fig. 2

Reconstructed object from the phase-only filter observed in the focal plane of lens L2. The LCTV acts as a multilevel phase hologram, leading to superimposed diffraction orders.

Fig. 3
Fig. 3

Three phase filters that had been calculated from the three objects shown were stored in the photorefractive crystal. The surface plots show the intensity distribution obtained in the correlation plane when the phase filter of the input object was displayed on the LCTV and the corresponding filter was read out from the holographic memory. The surface plot covers only 10% of the whole correlation plane.

Equations (1)

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Ix,y=FTexpjϕinputu,vexp-jϕiu,v2,

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