Journal
OPTICS LETTERS
Volume 38, Issue 11, Pages 1996-1998Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.38.001996
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Funding
- Foundation of Shaanxi Education Department of Shaanxi Province [11JK1032]
- Xi'an Science and Technology Bureau [CXY1120-1]
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A multiple-image encryption scheme is proposed based on the phase retrieval process and phase mask multiplexing in the fractional Fourier transform domain. First, each original gray-scale image is encoded into a phase only function by using the proposed phase retrieval process. Second, all the obtained phase functions are modulated into an interim, which is encrypted into the final ciphertext by using the fractional Fourier transform. From a plaintext image, a group of phase masks is generated in the encryption process. The corresponding decrypted image can be recovered from the ciphertext only with the correct phase mask group in the decryption process. Simulation results show that the proposed phase retrieval process has high convergence speed, and the encryption algorithm can avoid cross-talk; in addition, its encrypted capacity is considerably enhanced. (C) 2013 Optical Society of America
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