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Proceedings Paper

Image encryption scheme based on computer generated holography and time-averaged moiré
Author(s): Paulius Palevicius; Minvydas Ragulskis; Giedrius Janusas; Arvydas Palevicius
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Paper Abstract

A technique of computational image encryption and optical decryption based on computer generated holography and time-averaged moir´e is investigated in this paper. Dynamic visual cryptography (a visual cryptography scheme based on time-averaging geometric moir´e), Gerchberg–Saxton algorithm and 3D microstructure manufacturing techniques are used to construct the optical scheme. The secret is embedded into a cover image by using a stochastic moir´e grating and can be visually decoded by a naked eye. The secret is revealed if the amplitude of harmonic oscillations in the Fourier plane corresponds to an accurately preselected value. The process of the production of 3D microstructure is described in details. Computer generated holography is used in the design step and electron beam lithography is exploited for physical 3D patterning. The phase data of a complex 3D microstructure is obtained by Gerchberg-Saxton algorithm and is used to produce a computer generated hologram. Physical implementation of microstructure is performed by using a single layer polymethyl methacrylate as a basis for 3D microstructure. Numerical simulations demonstrate efficient applicability of this technique.

Paper Details

Date Published: 22 August 2017
PDF: 6 pages
Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 104531H (22 August 2017); doi: 10.1117/12.2272126
Show Author Affiliations
Paulius Palevicius, Kaunas Univ. of Technology (Lithuania)
Minvydas Ragulskis, Kaunas Univ. of Technology (Lithuania)
Giedrius Janusas, Kaunas Univ. of Technology (Lithuania)
Arvydas Palevicius, Kaunas Univ. of Technology (Lithuania)

Published in SPIE Proceedings Vol. 10453:
Third International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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