一种鲁棒的三维网格模型盲水印算法

A Strong Three-dimensional Mesh Blind Watermarking Algorithm

三维网格模型由于自身三维的特点,导致了模型水印针对旋转、缩放等仿射变换攻击的鲁棒性不强。该文提出了一种改进的盲水印算法,通过选取两个稳定的几何特征帮助排序来获得一个唯一的三维顶点序列,并将水印数据添加到顶点的纹理坐标中,使得仿射变换后也可以正确得到嵌入水印的顶点序列,从而正确地提取出水印。算法的透明性较好,对旋转、平移、均匀缩放以及顶点重排等模型攻击具有较好的鲁棒性。

3D mesh model＇s feature form such as model rotating, uniform result in model＇s watermark is not robust against attacks the attine transscaling. In this paper, we propose an improved blind watermarking algo-rithm. The algorithm choose two stable geometric features to help sorting to get a 3D only vertex array, then add watermark data on vertex＇s texture coordinates. The two stable geometric features are resistance to the affine transform, so we can obtain the vertex array correctly after watermarking the model. The algorithm is in- visible and is robust against attacks such as model rotating, translation, scaling and vertex permutation.