一种有效的细分曲面盲水印算法

An Effective Blind Watermarking Subdivision Surface Algorithm

本文提出的细分曲面数字水印算法是将水印嵌入细分曲面三维模型几何特征不变量中去,以提高水印的鲁棒性。先将原始网格细分迭代3次,模型转换到仿射不变空间,再抽取三维物体重心到顶点的距离生成一个一维的离散信号,将离散信号进行进行小波变换,改变其高频系数以嵌入水印,然后经过小波逆变换生成带水印的细分曲面。

This paper proposed a subdivision surface digital watermarking algorithm, the watermarking signals were embedded into Geometric properties invariants subdivision surface to improve the robust. Firstly, the original meshs were subdivided three times and the model were transformed to an affine invariant space. Secondly, a 1 D signal was produced through alculating the distance from the object center to the vertices, and performed awavelet transform on it, then embedded the watermark by changing the high frequency coefficients. Finally new subdivision surface was produced through inverse wavelet transforming.