关键词: 版权保护, 数字水印, 3D模型, 矢量, 鲁棒性

Abstract: A digital watermarking scheme proposed for the copyright protection of 3D mesh model using normal vector distribution of each patch.The key idea is to divide the 3D mesh model，replace center of mass of the whole 3D model by that of each patch，then generate the unit of each patch.At the basis of incurring minimal cost in terms of visual sensation system adjusting center of mass of each patch to embed individual bits of information which are spread over the whole surface of the model.Experimental results show that the proposed algorithm has robustness against various attacks such as cropping，affine transform，noise and simplification，and maximized the number of watermarking locations and enable to control the degree of redundancy if required.

Key words: copyright protection, digital watermarking, 3D model, normals, robustness