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Applied Optics

Applied Optics


  • Vol. 35, Iss. 26 — Sep. 10, 1996
  • pp: 5267–5274

Implementation of arbitrary real-valued correlation filters for the shadow-casting incoherent correlator

Vincent Laude, Pierre Chavel, and Philippe Réfrégier  »View Author Affiliations

Applied Optics, Vol. 35, Issue 26, pp. 5267-5274 (1996)

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We describe an incoherent correlator, based on the shadow-casting principle, that is able to implement any real-valued linear correlation filter. The correlation filter and the input image are displayed on commercial liquid-crystal television (LCTV) panels. Although it cannot handle high-resolution images, the incoherent correlator is lensless, compact, low cost, and uses a white-light source. A bipolar technique is devised to represent any linear filter, computed from a single reference image or composite, in the correlator. We demonstrate experimentally the efficiency of the design in the case of optimal trade-off (OT) filters and optimal trade-off synthetic discriminant function (OT–SDF) filters.

© 1996 Optical Society of America

Original Manuscript: November 6, 1995
Revised Manuscript: April 12, 1996
Published: September 10, 1996

Vincent Laude, Pierre Chavel, and Philippe Réfrégier, "Implementation of arbitrary real-valued correlation filters for the shadow-casting incoherent correlator," Appl. Opt. 35, 5267-5274 (1996)

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