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Opt Lett. 2013 Apr 15;38(8):1289-91. doi: 10.1364/OL.38.001289.

Optical image encryption with spatially incoherent illumination.

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Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Ministry of Education, and Department of Physics, Capital Normal University, Beijing 100048, China.


A simple optical image encryption system with spatially incoherent illumination is proposed. Only one Fourier lens and one random phase plate are contained in this system. The original image is perturbed by a random phase-only mask located on the aperture plane. The encrypted information is the only intensity distribution that can be directly recorded by a CCD or CMOS. The decryption procedure can be performed digitally and the random phase distribution works as the decryption key. Numerical simulations and experimental results demonstrate the validity of the proposed method.


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