一种改进的基于奇异值分解的数字水印算法  

A Improved Digital Watermarking Based on the B-SVD

作　　者：张登银[1] 刘琬[1] 

机构地区：[1]南京邮电大学计算机学院,江苏南京210003

出　　处：《计算机安全》2009年第2期22-24,共3页Network & Computer Security

摘　　要：基于奇异值分解(SVD)的数字水印算法对几何攻击有较强的鲁棒性,但是在嵌入水印的过程中,对较大特征值的修改会导致图像品质的明显下降。提出了一种改进的基于分块奇异值分解的数字水印算法,可以较好地解决上述问题,同时,该算法又利用小波变换来抵御一般的变换域攻击。实验表明,该算法在不可感知性和鲁棒性等方面都取得了比较好的效果。Algorithm which based on Block Singular Value Decomposition （B-SVD） for embedding the watermarking performs well for robustness the geometry attack. When the watermark bits are embedded into the original image, the largest SVD value may be changed .Therefore, the quality of the image will be degrade. Here, a watermarking algorithm based on block singular value decomposition （SVD） is proposed, the problem which mentioned above can be resolve well. At the same time, wavelet transform to the image can resist normal attack, so the algorithm does well in the security and practicability.

关 键 词：分块奇异值分解 小波变换 数字水印 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] O151.21[自动化与计算机技术—计算机科学与技术]