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- W2000330022 abstract "In this paper we present some results on the research line of real-time correlation applied to optical pattern recognition. We present a real time optical correlator that uses two twisted nematic liquid crystal spatial light modulators (SLM). This kind of SLM produces phase and amplitude coupled modulation. Phase modulation is useful for the implementation of phase only filters (POF), but the coupled amplitude modulation affects its performance. We present a model to evaluate the response of the phase-only filter (POF) implemented on a modulator with a restricted modulation and we show results on the optimal implementation of POF of this restricted coding domain. The phase modulation is also used for the implementation of the scene by means of a phase-encoding algorithm. The performance of the phase-only filter has been improved for several performances criteria by the design of binary amplitude masks. We present a technique for the implementation of these optimized binary amplitude phase-only filters using phase-mostly SLMs. Results obtained for the optimization of different criteria are presented. Finally, we present results on the application of these methods to color pattern recognition problems by a multichannel correlation." @default.
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- W2000330022 date "1999-10-01" @default.
- W2000330022 modified "2023-09-27" @default.
- W2000330022 title "<title>Adapting the input scene and the filter to the operating curves of the modulators in real-time correlators</title>" @default.
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- W2000330022 doi "https://doi.org/10.1117/12.363966" @default.
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