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Optics Letters

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  • Vol. 25, Iss. 16 — Aug. 15, 2000
  • pp: 1195–1197

Hybrid correlator employing a chirp-encoded binary phase-only filter

B. S. Lowans and M. F. Lewis  »View Author Affiliations


Optics Letters, Vol. 25, Issue 16, pp. 1195-1197 (2000)
http://dx.doi.org/10.1364/OL.25.001195


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Abstract

A novel correlator architecture is described that is similar to the VanderLugt correlator (VLC) but differs because the input Fourier transform (FT) is performed electronically rather than optically. We present results in which the FT's are reduced to binary phase-only filters (BPOF's); the required multiplication of the input and the reference FT's (performed optically in the VLC) is performed electronically simply by use of a single XOR logic gate. The problematic zero order and symmetric correlation peak are shown to be removed by use of a chirp-encoded BPOF.

© 2000 Optical Society of America

OCIS Codes
(100.1390) Image processing : Binary phase-only filters
(100.4550) Image processing : Correlators
(100.5010) Image processing : Pattern recognition

Citation
B. S. Lowans and M. F. Lewis, "Hybrid correlator employing a chirp-encoded binary phase-only filter," Opt. Lett. 25, 1195-1197 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-16-1195


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References

  1. A. VanderLugt, IEEE Trans. Inf. Theory IT-10, 139 (1964).
  2. The basic correlator without chirps was demonstrated in slow time by R. C. D. Young in 1994 at DERA.
  3. B. S. Lowans and M. F. Lewis, in Optics in Computing, 1999 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1999), paper OTuA11.
  4. T. D. Wilkinson, W. A. Crossland, T. C. Coker, A. B. Davey, M. Stanley, B. S. Lowans, M. F. Lewis, P. Shallow, J. Moore, and S. Lang, in Spatial Light Modulators, 1999 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1999), paper SMB2–1.
  5. R. W. M. Smith, C. J. Radford, G. Brown, and P. G. Ducksbury, in IEE Colloquium on Parallel Architectures for Image Processing, IEE Digest 135 (Institution of Electrical Engineers, London, 1994), pp. 4.1–4.8.
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  10. Q. Tang and B. Javidi, Appl. Opt. 32, 1911 (1993).
  11. S. E. Broomfield, M. A. A. Neil, E. G. S. Paige, R. H. Scarbrough, and G. G. Yang, Proc. SPIE 1732, 287 (1992).

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