基于固定正交基频谱分析的三维网格模型盲水印算法  

Blind watermarking scheme for 3D mesh models in transformed domain using fixed spectra

作　　者：徐涛[1] 张艳宁[1] 

机构地区：[1]西北工业大学计算机学院,陕西西安710072

出　　处：《光电工程》2007年第11期119-125,共7页Opto-Electronic Engineering

基　　金：高等学校博士学科点专项科研基金资助项目(20040699034)

摘　　要：为解决基于频率域的三维网格模型数字水印算法中存在的正交基函数不确定性问题,所提算法按网格对偶图构造出固定化的频谱正交基函数,选择一组相似变换不变量作为水印的实际载体,将其投影到固定正交基中实现频谱分解,水印信号隐藏在几个低频系数的线性关系中,提取水印时无需原始网格数据的参与,实验结果表明算法可抵抗平移、旋转、各向一致缩放处理,对低强度的网格几何数据压缩处理和噪声攻击亦具有一定的鲁棒性。In order to solve the problem that the spectral basis was uncertain in transformed domain based on watermarking algorithms for 3D mesh models, the proposed watermarking algorithm produced fixed spectral basis using the dual graph derived from the mesh topology. A group of geometric invariant values was chosen as watermark covering data and projected onto fixed spectral basis. Watermarking signal was hidden into low frequency coefficients by their linear relations, and original mesh datas were not needed when extracting watermark. Experimental results show the proposed algorithm can resist translating, rotating, uniformed scaling, and show robustness against mesh geometric compressing and noise with low intensity.

关 键 词：三维水印 网格水印 频率域 固定正交基 盲水印 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]