Paper
27 March 1997 Optical implementation of image encryption using random phase mask and speckle-free phase Fresnel hologram
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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.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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CITATIONS
Cited by 3 scholarly publications.
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KEYWORDS
Holograms

Image encryption

Spatial light modulators

3D image reconstruction

Image restoration

Fourier transforms

Lenses

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