Programmable optical security systems using computer-generated holography

Takanori Nomura; Bahram Javidi

doi:10.1117/12.405846

2 November 2000 Programmable optical security systems using computer-generated holography

Takanori Nomura, Bahram Javidi

Proceedings Volume 4113, Algorithms and Systems for Optical Information Processing IV; (2000) https://doi.org/10.1117/12.405846
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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.

Citation Download Citation

Takanori Nomura and Bahram Javidi "Programmable optical security systems using computer-generated holography", Proc. SPIE 4113, Algorithms and Systems for Optical Information Processing IV, (2 November 2000); https://doi.org/10.1117/12.405846

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