Colour light field image encryption based on DNA sequences and chaotic systems

The light field image (LFI) information includes the intensity of the collected object and the direction of the light through recording. An LFI with a 4-D scene representation includes a 2-D spatial domain and a 2-D angular domain, which is completely different than general natural images. To date, the encryption of natural images has been widely studied, while the encryption design of the LFI is missing. This work proposes an encryption scheme for colour LFI based on DNA sequences and chaotic systems. First, we employ an angular domain plane to represent the multi-view image of the LFI and then obtain a sub-view image in the spatial domain. For the given sub-view image and the random matrix, we apply a block processing method to divide multiple sub-blocks. Then, the DNA sequence and the chaotic system are used to encrypt the sub-view image. Moreover, considering the relationship between two planes, we apply the Arnold transform for all the sub-view images to realize the final encryption. Through three statistical analyses, three resistance attack analyses and two key analyses, experimental results show that the proposed scheme can be applicable, reliable, and secure enough.