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Proceedings Paper

Simple method for multiplexing channels in a Fourier optical processor
Author(s): S. Palma; J. Barbe; Juan Campos; Claudio C. Iemmi
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Paper Abstract

One of the most popular devices used into optical processors to display the images are the liquid crystal spatial light modulators (LCSLMs). Many applications in signal procession tasks use images with less resolution than the modern LCSLMs can be support. In this contribution we propose a new method based in a spatial multiplexing that uses the high resolution of the modern LCSLMs to introduce several channels in an optical correlator. The proposed method for the channels codification is based onto multiresolution analysis. Given an RGB image, before it will be displayed in LCSLM screen, a computer decompose the image in R, G and B channels and for each channel calculates a set of 50%, 25% and 12.5% scaled replicas. Then, in the place of the image, the computer send to LCSLM screen a composite scene with the original image and its replicas. Each of the images displayed in the scene defines one different channel in the optical correlator. In order to prove the method we develop an application based on signal analysis using a bank of 16 Gabor filters, that decompose the signal in 16 frequency channels (four orientations 0°, 45°, 90°, 135° and four frequencies 1/4, 1/8, 1/16, 1/32 cycles/pixels). With the proposed channels codification, a complete set of 16 filtered R, G and B images can be obtained using only 4 cycles of the optical processors, that minds that we increased the speed of the processor by factor 4.

Paper Details

Date Published: 21 October 2004
PDF: 6 pages
Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004);
Show Author Affiliations
S. Palma, Pontifica Univ. Catolica de Valparaiso (Chile)
J. Barbe, Pontifica Univ. Catolica de Valparaiso (Chile)
Univ. Autonoma de Barcelona (Spain)
Juan Campos, Univ. Autonoma de Barcelona (Spain)
Claudio C. Iemmi, Univ. de Buenos Aires (Argentina)

Published in SPIE Proceedings Vol. 5622:
5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications
Aristides Marcano O.; Jose Luis Paz, Editor(s)

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