Research on multiple-image encryption mechanism based on Radon transform and ghost imaging

In the process of multiple-image encryption, there are some problems such as low reconstruction accuracy, easy cross-talk, and poor robust performance. To solve these problems, a multiple-image encryption algorithm based on Radon transform and ghost imaging is proposed. Radon transform is applied to the encryption system of ghost imaging. The Cartesian coordinates of the two-dimensional images are firstly converted to the polar coordinates. Then, the Radon transform is fully used to obtain the projection of digital images at arbitrarily given angles. By adjusting the projecting angle interval, the spatial division multiplexing is used to realize the multiple-image encryption. By the numerical simulations and optical experiments, the feasibility of the proposed encryption system is verified. The results show that the proposed system not only reduces the amount of data transmission, but also improves the precision of the reconstructed image and the robustness of the encryption system. • The use of Radon transform reduces the data transmission and improves the imaging quality. • Radon transform is applied to the encryption system of ghost imaging (GI), which improves the robustness of the system. • The use of spatial division multiplexing can realize the encryption of multiple-image and eliminate cross-talk effect.