一种基于分块DCT变换的三维网格模型半脆弱水印算法  

A Semi-fragile Watermarking Scheme for 3D Mesh Models Based on Partitioned DCT

作　　者：徐涛[1] 罗中良[1] 陈志芳[1] 蔡彬滔 

机构地区：[1]惠州学院计算机科学系,广东惠州516007

出　　处：《中山大学学报（自然科学版）》2014年第2期38-43,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(61170193);惠州学院重点学科建设资助项目;广东省高等学校教学质量与教学改革工作本科类项目(粤教高函[2013]113号-113)

摘　　要：半脆弱水印可区分恶意攻击和正常数据处理,具有更广泛的适用性,但目前已提出的算法大多只能容忍少数类型的网格正常处理。文中提出了一种基于内容认证的半脆弱水印算法,网格分割后水印隐藏在各分块的DCT变换域系数中,网格被非法篡改时,通过匹配提取出的水印序列与原始水印序列可定位出篡改位置。实验结果表明,算法嵌入的半脆弱水印可容忍多种类型的网格正常数据处理,如网格RST相似变换和低强度的顶点坐标值量化处理,同时对恶意攻击表现敏感,可较准确的定位出篡改位置,并能以直观的可视化形式做出标记。Semi-fragile watermark has wider applicability,as it can distinguish malicious tampering and normal mesh processing.Most present algorithms can only tolerate a few types of normal mesh processing. A novel semi-fragile watermarking algorithm based on mesh content is proposed.In this algorithm,mesh is partitioned into some sub-meshes,and semi-fragile watermarks are hidden in DCT coefficients of each sub-mesh.When mesh is tampered,the position occurred can be located by matching the extracted wa-termark sequence and original watermark sequence.Experimental results show that the proposed algo-rithm can tolerate various mesh normal processing,such as mesh RST similar transforming,and quantiza-tion of vertex coordinates with low intensity,while is sensitive to malicious tampering.The proposed algo-rithm can also locate the tamering positions with relatively high precision.

关 键 词：三维水印 网格水印 半脆弱水印 DCT变换 内容认证 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]