Image encryption scheme based on fractional Mellin transform and phase retrieval technique in fractional Fourier domain

An image encryption scheme is proposed based on fractional Mellin transform and phase retrieval technique. Any image can be chosen as ciphertext, the selected annular domain of the specified image is first transformed by fractional Mellin transform. With the transformed result and original image, phase-key can be extracted by using phase retrieval technique in fractional Fourier domain. The proposed scheme can reduce the burden of transmission, enlarge key space, and can be extended to multiple-image encryption. Simulation results demonstrate the feasibility and effectiveness of the proposed scheme.

► An image encryption scheme is proposed by combining FrMT with PR technique.
► The scheme reduces transmission burden and can encrypt multiple images.
► The keys of the scheme include the phase-key and the orders of FrMT and FrFT.
► The parameters of FrMT can serve as additional keys.