Multiple Image Encryption Method Based on Light Field Imaging Theory and Chaotic System

In order to overcome the limitations of the existing optical encryption methods on high encryption system requirements, limited device performance, low encryption efficiency, and easy distortion of decrypted images, a multi-image encryption method based on the light field imaging principle and chaotic system was proposed. The method first generates random numbers through a chaotic system, and these numbers are used as the number of the light field imaging systems and the parameters of each system. Then multiple light field imaging systems are built according to the generated numbers in the computer. The images to be encrypted are spliced to a big image, and placed into the constructed light field imaging systems sequentially to obtain the corresponding light field images. By extracting and splicing the sub-aperture images of each light field image, the encryption of multiple images are achieved fast. The decryption process is the reverse of the encryption. The proposed method introduces the computing imaging technology into the encryption, which can avoid the limitation of real optical decives, and is easy to be achieved. The experimental results show that the proposed algorithm has low complexity of secure keys which can be transmitted easily. And it has good robustness to noise, large key space and high sensitivity of keys, which can provide high security. It also has high efficiency. The proposed method has widely potential uses in the fields of requiring plenty of images transmission with security.