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Optical Engineering

Halving the dimension of a single image to be encrypted optically to avoid data expansion
Author(s): Jiawang Yi; Guanzheng Tan
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Paper Abstract

When directly applying optical transforms, such as fractional Fourier transform (FrFT), to a single image or real image (input image), the resulting image will become complex-valued, which leads to the doubling of data volume. This data expansion problem can be found in many existing single-image optical encryption schemes. We propose a folding technique to offset the data expansion by constructing a complex input image of half size. And we devise an optical single-image encryption scheme based on double FrFTs, in which this technique together with compressed sensing can bring about the possible maximum compression of encrypted images. Moreover, the chaos-based random circular shift for scrambling is introduced to enhance security. The chaotic random signum matrix is also tried as the measurement matrix, and it displays a good performance. Simulation results demonstrate the validity and security of the proposed scheme.

Paper Details

Date Published: 28 June 2016
PDF: 11 pages
Opt. Eng. 55(6) 064111 doi: 10.1117/1.OE.55.6.064111
Published in: Optical Engineering Volume 55, Issue 6
Show Author Affiliations
Jiawang Yi, Central South Univ. (China)
Changsha Univ. of Science & Technology (China)
Guanzheng Tan, Central South Univ. (China)

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