摘要
从提高三维模型数字水印的鲁棒性和效率出发,提出一种新的频域水印算法。该算法利用网格拓扑结构,构建出目标顶点所处的局部几何空间,进而提取出适用于DCT变换的信息序列,修改频域系数嵌入水印;然后通过逆向DCT转回空域信号,修改目标顶点在局部几何空间中的位置得到含水印模型。算法实现简单,水印检测无需预处理,且能有效抵抗平移、旋转、缩放、剪切、网格简化等攻击。实验结果表明,该算法具有很好的鲁棒性、水印的不可感知性、水印检测高效准确的优势。
In order to improve the robustness and efficiency, proposes a new frequency domain method for watermarking in 3D model. It defines a local geometric space using the topology of 3D model, and then, we extract a signal in spatial domain and transform it to a signal in frequency domain using discrete cosine transform（DCT）. After that, a watermark is embedded by modifying the frequency coefficients. Finally, we transform the changed signal back to a digital signal in spatial domain, which determine the new position of the selected vertex within their related spaces. This method is simple to realize, and pretreatment is not needed during detection procedure. The experimental result shows that the algorithm guaranteed the high performance of the watermark robustness such as translation, rotation, scaling, vertex permutation, model cropping and model simplification etc. And the result also presents an evident superiority in non sentience of watermark, excellent efficiency and accuracy of detection.
出处
《现代计算机》
2011年第23期17-21,63,共6页
Modern Computer
