水平线在半脆弱性数字水印中的应用  

Application of Level-line in Semi-fragile Digital Watermark

作　　者：张明勋[1] 张亶[1] 江颉[1] 

机构地区：[1]浙江大学计算机科学与技术学院,杭州310027

出　　处：《计算机工程》2010年第22期147-149,152,共4页Computer Engineering

基　　金：国家"973"计划基金资助项目(2006CB303104);国家科技支撑计划基金资助项目(2008BAH21B03);浙江省自然科学基金资助项目(Y1080130)

摘　　要：提出一种利用图像自身特征——水平线作为水印的半脆弱数字水印算法。通过考虑人类视觉系统的掩蔽特征,较好地解决水印的透明性与鲁棒性问题,对嵌入前的水印采用Arnold变换,以提高水印的安全性。水印在提取时无需借助原始图像,在定位篡改区域时无需原水印。实验结果表明,该方法在水印透明性与鲁棒性方面具有较好的性能,并能大致确定篡改区域。This paper presents a semi-fragile digital watermark algorithm which embeds the level-line, a kind of character of image, into the Discrete Wavelet Transform（DWT） domain. By considering the masking characteristics of the Human Visual System（HVS）, it solves the problem between transparency and robustness. To improve the safety, it makes an Arnold transformztion to the Watermark before embedding. It does not need the original image when extracting the watermark, and the original watermark is not necessary when detecting and locating tampered areas. Experimental results show that the algorithm has good invisibility and high robustness against non-malicious attacks, and it can locate the tampered areas roughly.

关 键 词：水平线 人类视觉系统 ARNOLD变换 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]