Image communication scheme based on dynamic visual cryptography and computer generated holography

Computer generated holograms are often exploited to implement optical encryption schemes. This paper proposes the integration of dynamic visual cryptography (an optical technique based on the interplay of visual cryptography and time-averaging geometric moiré) with Gerchberg–Saxton algorithm. A stoc...

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Bibliographic Details
Published in:Optics communications 2015-01, Vol.335, p.161-167
Main Authors: Palevicius, Paulius, Ragulskis, Minvydas
Format: Article
Language:English
Subjects:
Algorithms
Computer generated holograms
Cryptography
Dynamics
Encryption
Holography
Moire
Moire fringes
Visual
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Summary:Computer generated holograms are often exploited to implement optical encryption schemes. This paper proposes the integration of dynamic visual cryptography (an optical technique based on the interplay of visual cryptography and time-averaging geometric moiré) with Gerchberg–Saxton algorithm. A stochastic moiré grating is used to embed the secret into a single cover image. The secret can be visually decoded by a naked eye if only the amplitude of harmonic oscillations corresponds to an accurately preselected value. The proposed visual image encryption scheme is based on computer generated holography, optical time-averaging moiré and principles of dynamic visual cryptography. Dynamic visual cryptography is used both for the initial encryption of the secret image and for the final decryption. Phase data of the encrypted image are computed by using Gerchberg–Saxton algorithm. The optical image is decrypted using the computationally reconstructed field of amplitudes.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2014.09.041