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24 May 2000 Phase-encoding the input scene of an optical correlator for realistic nonoverlapping noise
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Proceedings Volume 4089, Optics in Computing 2000; (2000)
Event: 2000 International Topical Meeting on Optics in Computing (OC2000), 2000, Quebec City, Canada
Optical correlators have been the subject of a growing interest over the past few years, since they enable a very fast computation of correlations, which are a major step in the design of many image processing algorithms. In this articles we will focus on the use of the nonlinear joint- transform correlator used as a location algorithm, which has been shown to provide good performances in terms of discrimination ability, and probability of correct location. When a optical correlator is used, the question of the choice of a method for encoding the input images arises. By the use of numerical simulations, we show that if the object to be located is perturbed by nonoverlapping noise, phase encoding can improve the correlation performance compared to amplitude encoding. We have recently provided a phenomenological interpretation of this fact, based on the histogram modifications undergone within the target and the background. We analyze here more precisely these modifications and extend these results to some realistic situations when the only knowledge about the target is its shape.
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V. Page and Francois Goudail "Phase-encoding the input scene of an optical correlator for realistic nonoverlapping noise", Proc. SPIE 4089, Optics in Computing 2000, (24 May 2000);

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