基于整数小波变换的三维网格数字水印算法

提出一种整数小波变换的三维网格数字水印算法.网格顶点到网格中心的距离具有全局几何特性,利用整数小波变换把距离序列变化到频域;然后在频域信号上嵌入水印信息,再通过逆整数小波变换转回到空域信号;最后根据新的空域信号的值修改网格上点的坐标得到加入数字水印的网格.实验结果表明:该算法实现简单,在简化攻击、噪音攻击情况下具有良好的鲁棒性.

A Watermark Algorithm for Three Dimensional Meshes Based on Integer Wavelet Transform

A three-dimensional triangular meshes digital watermarking algorithm based on integer wavelet transform is proposed.The distance between each vertex in the mesh to the center of the mesh has global geometric features.The distance sequence is transformed to the frequency domain from the spatial domain using integer wavelet transform,and the authors embed a watermark into the frequency domain,and then transform it back to a digital signal in spatial domain using inverse integer wavelet transform.This new spatial domain signal represents the new values of the distances after embedding a watermark.Finally,they modify the coordinates of the vertices making their distances to the mesh center satisfy these new values.Experiments show that this algorithm is both simple to implementation and fairly robust against common mesh attacks such as mesh cropping,random noise added to the vertex coordinates etc.