Multi-carrier Information Hiding Algorithm Based on Point Cloud Convex Hull Fusion

In order to further break through the invisibility and robustness of the 3D model multi-carrier information hiding algorithm, this paper proposes a multi-carrier information hiding algorithm based on point cloud convex hull fusion. First of all, in order to make the surface features of the fused point cloud model more obvious, the point cloud model is fused by convex hull center point fusion. Secondly, based on the Morse theory, the points of the fusion state model are classified, and the robust minimum points and multi-saddle points are obtained. Finally, the double embedding of the secret information is completed by slightly modifying the RGB channel strength at a specific point, which ensures the integrity of the secret information. The experimental data prove that the invisibility of the algorithm have been improved to a certain extent, and the robustness of the algorithm is relatively high in the face of attacks such as clipping, random noise addition, and simplification. The algorithm in this paper provides a new direction for information hiding based on 3D models.