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5 November 2014 Optical image encryption based on a modified radial shearing interferometer
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We present an optical image encryption method based on a modified radial shearing interferometer. In our encryption process, a plaintext image is first encoded into a phase-only mask (POM), and then modulated by a random phase mask (RPM), the result is regarded as the input of the radial shearing interferometer and divided into two coherent lights, one of which will be further modulated by a random amplitude mask (RAM). After all, these two coherent lights will interfere with each other leading to an interferogram, i.e., ciphertext. And the ciphertext can be used to retrieve the plaintext image with the help of a recursive algorithm and all correct keys. The aforementioned encryption procedure can be achieved digitally or optically while the decryption process can be analytically accomplished. Numerical simulation is provided to demonstrate the validity of this method.
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Dajiang Lu, Wenqi He, and Xiang Peng "Optical image encryption based on a modified radial shearing interferometer", Proc. SPIE 9273, Optoelectronic Imaging and Multimedia Technology III, 927313 (5 November 2014);

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