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Proceedings Paper

Phase-only SLMs for optical pattern recognition and security systems
Author(s): Yunlong Sheng; Luiz Goncalves Neto; Danny Roberge; Lixin Shen; Giles Paul Hus
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Paper Abstract

Original experimental techniques for obtaining the phase-only modulation and the complex amplitude modulation with the commercial twisted nematic liquid crystal televisions (LCTV) are described. The techniques are based on the Jones matrix theoretical analysis. We use the programmable phase-mostly LCTV to optically implement the phase-only matched filters, phase-only circular harmonic filters, phase-only synthetic discriminant functions and the adaptive composite wavelet matched filters for pattern recognition. We also implement the phase-only computer generated holograms, speckle-free kinoforms and optical kinoform encryption using random phase encoding for security applications.

Paper Details

Date Published: 9 August 1996
PDF: 25 pages
Proc. SPIE 10287, Optoelectronic Devices and Systems for Processing: A Critical Review, 1028707 (9 August 1996); doi: 10.1117/12.259698
Show Author Affiliations
Yunlong Sheng, Univ. Laval (Canada)
Luiz Goncalves Neto, Univ. de Sao Paulo (Brazil)
Danny Roberge, MYTEC Technologies Inc. (Canada)
Lixin Shen, MYTEC Technologies Inc. (Canada)
Giles Paul Hus, Univ. Laval (Canada)

Published in SPIE Proceedings Vol. 10287:
Optoelectronic Devices and Systems for Processing: A Critical Review
Bahram Javidi; Kristina M. Johnson, Editor(s)

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