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Optical multi-image encryption based on frequency shift |
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| Authors: | Zhengjun Liu Yan Zhang Haifa Zhao Shutian Liu |
| Affiliation: | a Department of Physics, Harbin Institute of Technology, Harbin 150001, China b Department of Physics, Capital Normal University, Xisanhuan Beilu 105 Beijing 100037, China c Department of Automation Measurement and Control Engineering, Harbin Institute of Technology, Harbin 150001, China d Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan |
| Abstract: | We present a novel multi-image encryption and decryption algorithm based on Fourier transform and fractional Fourier transforms. Lower frequency parts of the original images are selected, frequency shifted and encrypted by using double phase encoding in fractional Fourier domains. Multiple images are encrypted together into a single one. A simple optical setup is given to implement the proposed algorithm. This scheme has features of enhancement in decryption accuracy and high optical efficiency. Numerical results have been given to verify the validity and efficiency of the proposed scheme. |
| Keywords: | Image encryption Cryptography Optical transform |
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