Abstract

A real-time optical processing system with dual liquid-crystal spatial light modulators is constructed and used as both an amplitude-input device and a multilevel phase-only filter. Fourier analysis is given to show the performance of light efficiency, signal-to-noise ratio, and discrimination capability with the binarization of gray objects. The ratio of the dc power spectrum to the power spectra for input objects is introduced to incorporate the power spectrum into discrimination-capability evaluation. A numerical calculation is performed for gray-level and binarized amplitude-phase correlations. Improvement of the performance criteria has been achieved for an amplitude in a binary mode to a phase correlator. The higher the threshold level of the binarized objects is, the better performance criteria are produced. The effect of illumination over an input object on the autocorrelation maximum is experimentally investigated. Experimental results are presented to support the calculations.

© 1997 Optical Society of America

Real-time binary-amplitude phase-only filters

Ignacio Moreno, Esmail Ahouzi, Juan Campos, and María J. Yzuel
Appl. Opt. 36(29) 7428-7432 (1997)

Error-diffusion binarization for joint transform correlators

Hanni Inbar, David Mendlovic, and Emanuel Marom
Appl. Opt. 32(5) 707-714 (1993)

Modified joint transform correlator binarized by error-diffusion. I. Spatially constant noise-dependent range limit

Hanni Inbar, Naim Konforti, and Emanuel Marom
Appl. Opt. 33(20) 4434-4443 (1994)

Nonlinear filtering in object and Fourier space in a joint transform optical correlator: comparison and experimental realization

Santiago Vallmitjana, Arturo Carnicer, Estela Martín-Badosa, and Ignacio Juvells
Appl. Opt. 34(20) 3942-3949 (1995)

Phase calibration and applications of a liquid-crystal spatial light modulator

Alain Bergeron, Jonny Gauvin, François Gagnon, Denis Gingras, Henri H. Arsenault, and Michel Doucet
Appl. Opt. 34(23) 5133-5139 (1995)