Full-color holographic encryption system using the hierarchical chaotic algorithm

In the context of increasing demand for secure 3D object encryption and the development of holographic technology, this paper proposes a multi-depth, full-color holographic encryption system based on a hierarchical chaotic algorithm (HCA). A high-quality three-dimensional mesh is automatically generated from a two-dimensional image, which is more efficient and versatile than using a depth camera to generate a 3D mesh. The 3D information is divided into multiple layers by point cloud gridding (PCG) processing, and then these layers are encoded into computer-generated holograms (CGHs). The HCA utilizes a 2D chaotic mapping to encrypt the holograms in each layer, which ensures high key sensitivity and a large key space and enhances the security of 3D image encryption. The simulation results demonstrate the robustness and efficiency of our proposed method, and optical experiments verify the feasibility of the method.