一种采用改进奇偶量化方法的二维工程图半脆弱水印算法  

Semi-fragile Watermarking Algorithm for 2D Engineering Graphics Based on Improved Odd-Even Quantization

作　　者：郭热思[1] 彭飞[1] 

机构地区：[1]湖南大学计算机与通信学院,湖南长沙410082

出　　处：《小型微型计算机系统》2010年第10期2096-2100,共5页Journal of Chinese Computer Systems

基　　金：湖南省自然科学基金项目(09JJ4032)资助

摘　　要：基于改进的奇偶量化方法,提出一种二维工程图半脆弱水印算法。针对一般的奇偶量化方法存在误检率较高的不足,引入参考量进行了改进,有效的降低了误检率,使改进后的奇偶量化方法更适用于脆弱水印。算法首先获得二维工程图中的实体集,并对实体集进行分组,分别在每一个分组内采用改进的奇偶量化方法嵌入水印信息。实验结果与分析表明,算法对图形的平移、旋转以及均匀缩放具有鲁棒性,但对恶意攻击(如添加、删除、修改二维工程图内容等)极度敏感,且能有效检测并正确定位发生篡改的区域,该算法为二维工程图的内容认证提供了一种有效的方法。A semi-fragile watermarking algorithm for 2D engineering graphics based on improved odd-even quantization is proposed. For the high false-positive rate in traditional odd-even quantization method, an improved quantization method is put forward, which is suitable for fragile watermarking. In the algorithm, the entity set is firstly acquired from the 2D engineering graphic, then they are arranged in groups, finally the watermark is embedded in each group with the method of odd-even quantization. Experimental results and analysis show that the proposed algorithm is robust against some incidental operations such as rotation, translation, scaling, but it is sensitive to malicious attacks （ such as adding, deletion and modification to the content of 2D engineering graphics） and can detect and locate the attacks correctly. It is an effective method for the authentication of the content of 2D engineering graphics.

关 键 词：半脆弱水印 二维工程图 奇偶量化方法 内容认证 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]