摘要
为了解决数字水印算法的鲁棒性与脆弱性之间的矛盾,提出了一种新的具有自适应性的半脆弱数字水印算法,重点介绍了数字水印的嵌入算法。该算法通过采用改进的低通滤波器,调整中间像素灰度、改变两端的灰度差分来实现水印的嵌入。实验结果表明,该算法对Photoshop下所有级别的JPEG压缩均具有鲁棒性,而对所有几何变换等恶意攻击具有脆弱性;并可根据所提取水印判断出恶意攻击的类型、程度、区域等特征,具有较好的自适应性。
In order to solve the contradiction between robustness and vulnerability of digital watermarking algorithm,this paper proposed a new self-adaptive semi-fragile digital watermarking method,with emphasis on digital watermarking embedding algorithm.By using improved low-pass filter,this algorithm adjusted gray value of middle pixel and changed gray-value diffe-rential of two terminal to embed the digital watermark.The experimental results show that this algorithm has strong robustness on all JPEG compression of Photoshop and has vulnerability for all geometric transformation malicious attacks.And from the extracted watermark,it can judge the characteristics of malicious attacks,such as types,extent and region.This algorithm shows good adaptability.
出处
《计算机应用研究》
CSCD
北大核心
2011年第5期1937-1939,共3页
Application Research of Computers
基金
河南省教育厅科技攻关资助项目(2010C510016)
关键词
数字水印
半脆弱
低通滤波器
灰度差分
梯度阈值
自适应性
digital watermarking
semi-fragile
low-pass filter
gray-value differential
gradient threshold
self-adaptive
