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Proceedings Paper

Optical implementation of image encryption using random phase mask and speckle-free phase Fresnel hologram
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Paper Abstract

Optical random phase masks have been proposed for security applications and image encryption. A speckle noise problem caused by the random phase mask over the reconstructed image was analyzed in a previous work, and a system using speckle- free Fourier holograms and a phase-mostly spatial light modulator (SLM) was proposed. In this paper we propose a method for the optical implementation of image encryption using a speckle-free phase Fresnel hologram and a phase- mostly spatial light modulator. A speckle-free Fresnel information. Since this approach could be implemented using a reduced number of lenses or no lenses, it has a potential for commercial applications.

Paper Details

Date Published: 27 March 1997
PDF: 8 pages
Proc. SPIE 3073, Optical Pattern Recognition VIII, (27 March 1997); doi: 10.1117/12.270387
Show Author Affiliations
Luiz Goncalves Neto, Univ. de Sao Paulo (Brazil)
Yunlong Sheng, Univ. Laval (Canada)


Published in SPIE Proceedings Vol. 3073:
Optical Pattern Recognition VIII
David P. Casasent; Tien-Hsin Chao, Editor(s)

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