提出一种基于特征点模长的三维网格模型数字水印算法。该算法根据各个顶点的邻接三角面的法线方向提取用于嵌入水印的特征点;比较特征点的模长和其所有邻接点的平均模长;根据所嵌入的水印来修改特征点模长。实验结果表明,该算法水印具有良好的不可见性,对几何变换攻击、噪声攻击等具有良好的鲁棒性。
We propose a novel watermarking algorithm of 3D mesh model based on norms of feature points. In this algorithm the feature points for embedding watermark are detected according to the norm direction of neighbor triangles of each point. Then we compare the norms of the feature points with the mean norms of neighbor points; modify the norms of the feature points according to the watermarking embedded. The experiment results show that the watermark of the proposed algorithm has good imperceptibility and robustness against various attacks such as affine attack, mesh simplification, mesh cropping, and noise attack.