A Locatable Zero Watermarking Scheme and Visualization for 3D Mesh Models

Nowadays, most 3D mesh model protections are based on embedding watermarking system. These methods have to change the original mesh data to achieve the watermarking. Considering the sensitivity and complexity of 3D mesh data, this paper proposes a disturbing free ´zero-watermarking´ algorithm, which is based on octree partition. For each octant, we employ parameterization and singular value decomposition (SVD) to analyze the 3D geometry signal and construct the zero-watermark with corresponding octree-codec. The integrity of protected 3D mesh can be checked through computing the similarity of watermark between original and processed mesh. Moreover, the results are represented in a visual way, which means the tendency of deviation and changed region will be colored according to our merits of similarity. The experiment results verify that the algorithm is robust to various attacks including affine transformation, vetex reordering, noise addition, cropping, simplifying, and even mixed attack.