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Optical Engineering

Double image encryption using phase-shifting interferometry and random mixed encoding method in fractional Fourier transform domain
Author(s): Qu Wang; Qing Guo; Liang Lei; Jinyun Zhou
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Paper Abstract

Based on the two-step phase-shifting interference (PSI) technique in fractional Fourier transform (FRT) domain and random mixed encoding, we present a new scheme for double image encryption. In the proposed scheme, information of each primitive image is recorded in two intensity interference patterns of FRT spectra by PSI technique, from which an encrypted image for each primitive image can be digitally derived. Random mixed encoding is then employed to divide and recombine both encrypted images into a single synthetic encrypted image. During the mixed encoding process, repositioning operations based on shift-variance of FRT are performed on the encrypted images to realize the spatial separation of decoded results in the output plane. By inverse FRT with correct fractional order, any of the primitive images can be easily retrieved directly from the synthetic encoded image with the corresponding phase encoding key. Crosstalk effect due to the overlapping of decoded images is alleviated for their spatial separation. Computer simulation and experimental results are presented to verify the validity and efficiency of our scheme.

Paper Details

Date Published: 2 August 2013
PDF: 9 pages
Opt. Eng. 52(8) 084101 doi: 10.1117/1.OE.52.8.084101
Published in: Optical Engineering Volume 52, Issue 8
Show Author Affiliations
Qu Wang, Guangdong Univ. of Technology (China)
Qing Guo, Institute of Remote Sensing and Digital Earth (China)
Liang Lei, Guangdong Univ. of Technology (China)
Jinyun Zhou, Guangdong Univ. of Technology (China)

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