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Applied Optics

Applied Optics


  • Vol. 37, Iss. 17 — Jun. 10, 1998
  • pp: 3664–3677

Investigations into reduced-resolution optical correlators with realistic spatial light modulator fill factors

Paul C. Miller  »View Author Affiliations

Applied Optics, Vol. 37, Issue 17, pp. 3664-3677 (1998)

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The design of reduced-resolution filters by multiresolution analysis (MA) or by downsampling is extended to spatial light modulators with fill factors less than one. Analysis shows that the dependence of the zero-order correlation peaks with fill factor varies with target size for both design techniques. Also, a practicable performance improvement is obtained for MA compared with downsampling for small- to medium-sized targets that is greater for larger fill factors. The validity of the analysis is confirmed by simulation. A reduced-resolution optical correlator is constructed, and a comparison of MA and downsampling filters is performed for different-sized targets. The experimental results show good qualitative agreement with the simulation; however, the first-order correlation peaks were found to be greater for the experimental results. A possible reason for this is that the manufacturer’s fill-factor specification might be too large; therefore a new technique for measuring the fill factor is proposed.

© 1998 Optical Society of America

OCIS Codes
(100.1160) Image processing : Analog optical image processing
(100.1390) Image processing : Binary phase-only filters
(100.4550) Image processing : Correlators
(100.5010) Image processing : Pattern recognition
(100.7410) Image processing : Wavelets
(230.6120) Optical devices : Spatial light modulators

Paul C. Miller, "Investigations into Reduced-Resolution Optical Correlators with Realistic Spatial Light Modulator Fill Factors," Appl. Opt. 37, 3664-3677 (1998)

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