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Proceedings Paper

Improving contrast in optical Fourier transforms with spatial light modulators: use in optical correlation
Author(s): Santiago Vallmitjana; Estela Martin-Badosa; Salvador Bosch; Arturo Carnicer
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Paper Abstract

When real time optical pattern recognition is carried out by means of spatial light modulators (SLMs), a practical situation may arise in which the size of the Fourier transform and the intensity of the light source are fixed. Then, provided the input scene and the size of the SLM allow it, an interesting possibility for improving the overall intensity in the Fourier plane is the replication of the scene. This procedure may be used in two different ways: regular along a lattice structure or non regular or random replication. In this work we analyze the usefulness of these methods, both to obtain diffraction images or cross-correlation between images in a joint transform correlator.

Paper Details

Date Published: 29 September 1994
PDF: 8 pages
Proc. SPIE 2297, Photonics for Processors, Neural Networks, and Memories II, (29 September 1994); doi: 10.1117/12.187276
Show Author Affiliations
Santiago Vallmitjana, Univ. de Barcelona (Spain)
Estela Martin-Badosa, Univ. de Barcelona (Spain)
Salvador Bosch, Univ. de Barcelona (Spain)
Arturo Carnicer, Univ. de Barcelona (Spain)

Published in SPIE Proceedings Vol. 2297:
Photonics for Processors, Neural Networks, and Memories II
Joseph L. Horner; Bahram Javidi; Stephen T. Kowel, Editor(s)

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