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Proceedings Paper

Programmable optical security systems using computer-generated holography
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Paper Abstract

A double random phase optical encryption system that uses a binary key code is proposed. The key code is generated as a binary computer generated hologram. The binary key code can be displayed on a binary spatial light modulator such as a ferroelectric liquid crystal display. The use of a binary spatial light modulator enables us to renew the key at high speed. A joint transform correlator based on a photorefractive crystal in the Fourier domain is used to perform shift invariant encryption and decryption. Computer simulations of the effects of using a binary encoded key code instead of a complex amplitude key code are shown. Preliminary optical experimental results are presented to demonstrate the effectiveness of the proposed system.

Paper Details

Date Published: 2 November 2000
PDF: 9 pages
Proc. SPIE 4113, Algorithms and Systems for Optical Information Processing IV, (2 November 2000); doi: 10.1117/12.405846
Show Author Affiliations
Takanori Nomura, Wakayama Univ. (Japan)
Bahram Javidi, Univ. of Connecticut (United States)


Published in SPIE Proceedings Vol. 4113:
Algorithms and Systems for Optical Information Processing IV
Bahram Javidi; Demetri Psaltis, Editor(s)

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