Composite Information Hiding Algorithm Based on Three-Dimensional Model Grid Structure Characteristics

In order to improve the capacity and robustness of 3D model information hiding, a composite information hiding algorithm based on 3D model mesh characteristics is proposed in this paper. First, compute the vertex strength of the 3D model, divide the vertices of the 3D model, arrange the vertices of each area into a one-dimensional sequence according to the vertex strength in descending order, and then generate the vertex strength matrix according to the characteristics of the secret information data; Embed the vertex intensity matrix, adjust the vertex coordinates of the 3D model according to the vertex intensity matrix of the embedded information; finally, calculate the intensity of the triangular mesh of the 3D model and normalize it, and adjust the triangular mesh in the face list of the OBJ file of the 3D model according to the information embedding rules order to complete the embedding. The experimental results show that the algorithm can significantly improve the embedding capacity, and has strong robustness to geometric transformation, clipping, simplification and noise attacks.