基于频率域的三维网格模型零水印算法  

Zero-Watermarking Scheme Based on Frequency Domain

作　　者：徐涛[1] 卢剑伟[2] 

机构地区：[1]惠州学院计算机科学系,广东惠州516007 [2]合肥工业大学机械与汽车工程学院,安徽合肥230009

出　　处：《计算机仿真》2011年第5期135-138,共4页Computer Simulation

基　　金：国家高技术研究发展计划(863计划)项目(200904AA04Z108);惠州学院博士科研启动基金项目

摘　　要：针对加强行版权保护问题,传统水印嵌入算法为避免模型失真,只能降低水印嵌入强度,但会造成水印鲁棒性下降,采用零水印方法则可以有效的解决水印透明性和鲁棒性之间的矛盾问题,提出了一种基于频率域的三维网格模型零水印算法,不对模型数据进行任何改动,将模型按拓扑数据分割为若干子块,在各子块内进行拉普拉斯频谱分解,用于注册的水印由包含模型几何特征主要能量的频域低频系数构造生成。实验结果表明,算法可避免模型失真,构造的水印可以抵抗多种常见的攻击手段,例如网格的平移、旋转、各向一致缩放处理,以及一定强度的顶点随机噪声攻击,并且算法在提取水印时可无需原始网格模型参与。Since 3D mesh models were sensitive to embedding watermarks,traditional watermarking algorithms only reduced watermark embedding intensity to avoid distortion of the model,however this would degrade robustness of watermark at the same time.Zero watermarking method can effectively solve the contradictions between watermark transparency and watermark robustness.In this paper,we proposed a zero watermarking algorithm based on frequency domain.Registered watermark was constructed by feature extraction of mesh geometric data,and didn＇t modify any mesh data.This algorithm partitioned the mesh model into some sub-meshes according to the topologic data,and executed Laplacian spectral decomposition in each sub-mesh.Registered watermark was constructed by low frequency domain coefficients.Experimental results show that the proposed algorithm can avoid distortion of the model,and can resist a variety of common attacks,such as mesh translating,mesh uniformed-scaling,mesh rotating,and random noise tampering on vertex with some intensity.The watermark can be extracted without original mesh model.

关 键 词：三维水印 网格水印 零水印 频率域 拉普拉斯频谱分解 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]