Monaghan, David S. and Gopinathan, Unnikrishnan and Kelly, Damian P. and Naughton, Thomas J. and Sheridan, John T.
Systematic errors of an optical encryption
system due to the discrete values of a spatial light
Optical Engineering, 48 (2).
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.
||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.
||optical encryption; digital image processing; spatial light
||Faculty of Science and Engineering > Computer Science
||09 Nov 2010 16:46
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