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

Luiz Goncalves Neto; Yunlong Sheng

doi:10.1117/12.270387

27 March 1997 Optical implementation of image encryption using random phase mask and speckle-free phase Fresnel hologram

Luiz Goncalves Neto, Yunlong Sheng

Author Affiliations +

Proceedings Volume 3073, Optical Pattern Recognition VIII; (1997) https://doi.org/10.1117/12.270387
Event: AeroSense '97, 1997, Orlando, FL, United States

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.

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Luiz Goncalves Neto and Yunlong Sheng "Optical implementation of image encryption using random phase mask and speckle-free phase Fresnel hologram", Proc. SPIE 3073, Optical Pattern Recognition VIII, (27 March 1997); https://doi.org/10.1117/12.270387

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