Systematic errors of an optical encryption system due to the discrete values of a spatial light modulator

Monaghan, David S. and Gopinathan, Unnikrishnan and Kelly, Damian P. and Naughton, Thomas J. and Sheridan, John T. (2009) Systematic errors of an optical encryption system due to the discrete values of a spatial light modulator. Optical Engineering, 48 (2). 027001.1-027001.7. ISSN 0091-3286

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An optical implementation of the amplitude encoded double random phase encryption/decryption technique is implemented, and both numerical and experimental results are presented. In particular, we examine the effect of quantization in the decryption process due to the discrete values and quantized levels, which a spatial light modulator (SLM) can physically display. To do this, we characterize a transmissive SLM using Jones matrices and then map a complex image to the physically achievable levels of the SLM using the pseudorandom encoding technique. We present both numerical and experimental results that quantify the performance of the system.

Item Type: Article
Additional Information: Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. We acknowledge the support of Enterprise Ireland and Science Foundation Ireland through the Research Innovation and Proof of Concept Funds, and the Basic Research and Research Frontiers Programmes. We also thank the Irish Research Council for Science, Engineering and Technology. One of the authors (DSM) acknowledges the support of a SPIE Educational Scholarship.
Keywords: optical encryption; digital image processing; spatial light modulator; quantization;
Academic Unit: Faculty of Science and Engineering > Computer Science
Item ID: 2241
Identification Number: DOI: 10.1117/1.3076208
Depositing User: Thomas Naughton
Date Deposited: 09 Nov 2010 16:46
Journal or Publication Title: Optical Engineering
Publisher: SPIE Press
Refereed: Yes
Funders: Enterprise Ireland, Science Foundation, Ireland

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