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

Vincent Laude (1) , Pierre Chavel (2) , Philippe Réfrégier (1, 3)

1 Thomson-CSF Laboratoire Central de Recherches
2 Laboratoire Charles Fabry de l'Institut d'Optique / Scop
3 FRESNEL - Institut FRESNEL

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

Domaines: Recherche d'information [cs.IR]

Vincent Laude, Pierre Chavel, Philippe Réfrégier. Implementation of arbitrary real-valued correlation filters for the shadow-casting incoherent correlator. Applied optics, 1996, 35 (26), pp.5267-5274. ⟨hal-00081211⟩