3-D color light field image encryption based on micro-lens array

In this paper, we present a high-dimension image encrypting method to encrypt 3D color image. Inspired by the fact that light field camera can capture both the spatial information and directional information, we use a micro-lens array to obtain both the 2D spatial and 2D directional information to form the 4D distributions of light beams, then the chaotic method and Arnold transform are employed to encrypt the spatial information and directional formation respectively. The decrypted 4D light field data can be used to reconstruct image with adjustable focal length. Numerical simulations show that the proposed method has high sensitiveness to its key spaces and high security in statistical information. In addition, test results illustrate that the proposed method has strong robustness when occlusion attacks occur.

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