A 3D model data hiding algorithm based on local coordinate system

This paper proposes a 3d model data hiding scheme on a new local coordinate system, which is obtained by a vertex and its neighbors of the model. Embedding primitives are first transformed into local orthogonal coordinate systems and then to local coordinate spherical systems, messages are embedded by modifying the vertexpsilas longitude and latitude of the local spherical coordinate system. There have been several papers published on 3D model watermarking of local coordinate system for copyright protection, but the requirement of imperceptibility is not well considered. Besides, the capacity of the corresponding algorithms for secret communications is not evaluated. Based on the above analysis the proposed algorithm is designed and proved by experimental results to have good imperceptibility, high capacity and robustness against RST attack.