提出了一种基于小波变换的三维模型加密全息盲水印算法。该算法选取三维模型球面坐标与重心的距离作为离散二维信号,首先进行小波变换得到水平分量,水平分量经过小波变换后得到低频部分,将水印图像经光全息加密嵌入到低频部分,再经过逆小波变换生成含水印的三维模型,水印的提取是水印嵌入的逆过程。实验结果表明,该方法对噪声攻击、旋转、平移、比例变换、重排序攻击等具有很好的鲁棒性,且加密全息水印图像具有很好的水印安全性。

A blind digital watermarking algorithm for 3D model based on wavelet transform and optical holographic encryption is developed. The proposed algorithm takes the radius distance of the object center to the vertices as the discrete two-dimensional signals. Firstly,the horizontal component is computed by the first wavelet transform. Then the horizontal component is processed by the second wavelet transform to get the low-frequency part. Optical holographic encryption watermark image is embedded into the low-frequency part. The embedded model can be generated by the inverse wavelet transform of the revised low frequency part. Extracting the watermark embedding is the inverse process. The experimental results show that the algorithm guarantees the high performance of the watermark robustness to the attacks such as noise attacks,rotation,translation,scaling attacks and vertex permutation. And the optical holographic encryption watermark image guarantees the security of the algorithm.