摘要
现有水印算法中存在一类新的安全性问题,即水印的伪验证,为避免在新提出的一种基于DWT域多层分解的零水印算法中出现此类问题,尝试给出了抑制其伪验证性问题的新方法。该方法基于假设检验理论,着重分析了图像局部小波系数差值变化及方差变化对水印算法鲁棒性和伪验证性的影响,并据此给出了算法参数的最佳选择条件以及改进的水印检测式。实验结果表明,新算法不仅对压缩、中值滤波、加噪、剪切、放缩等操作具有良好的鲁棒性,对可能存在的水印伪验证也具有很好的抑制性。
According to analysis,a new security problem of fake verification in watermark algorithms is discovered.To avoid such security problem which may exist in the new presented image zero-watermark algorithm based on multilayer decomposition in DWT domain,a new method which can inhibits the fake verification is presented.On the basis of hypothesis testing theory,this method analyzes the conditions that the watermark algorithm robustness and fake verification are related to the image local wavelet coefficient difference and variance change.Then,the algorithm parameter＇s best alternative conditions and its improved watermark testing method are presented.Experimental samples show that the new algorithm not only has good robustness to such operations as compression,shearing,noise addition,median filtering and scaling,but also has good inhibition to possible watermark fake verification.
出处
《计算机工程与设计》
CSCD
北大核心
2011年第9期2953-2956,2960,共5页
Computer Engineering and Design
