In this paper, an optical color image encryption/decryption technology based on joint fractional Fourier transform correlator and double random phase encoding (DRPE) is developed. In this method, the joint fractional power spectrum of the image to be encrypted and the key codes is recorded as the encrypted data. Different from the case with classical DRPE, the same key code was used both in the encryption and decryption. The security of the system is enhanced because of the fractional order as a new added key. This method takes full advantage of the parallel processing features of the optical system, and could optically realize single-channel color image encryption. The experimental results indicate that the new method is feasible.
A novel single-channel color image encryption technique based on joint fractional Fourier transform correlator(JFRTC)
and phase retrieval algorithm (PRA) is proposed. The target color image is decomposed into three red, green, blue (RGB)
components. A joint image is formed and encoded into two random phase masks (RPM) iteratively. The security of the
system is enhanced because of the fractional order as a new added key. The system and the operation procedure are
simplified. Simulation experiments show that the algorithm converges rapidly and has great design flexibility. The
decryption can be realized by digital or optical methods.
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