抵抗图像区域攻击的鲁棒性水印算法  

Novel robust watermarking algorithm for regional attacks of digital images

作　　者：王友卫[1] 刘元宁[1] 朱晓冬[1] 

机构地区：[1]吉林大学计算机科学与技术学院,长春130012

出　　处：《吉林大学学报（工学版）》2014年第4期1151-1158,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(60971089);国家重大科技成果转化项目(财建[2010]341号)

摘　　要：为提升算法抵抗数字图像区域攻击能力,提出了一种安全的强鲁棒性数字水印算法。引入随机四元组的概念,使用宿主图像每个随机四元组中的每个8×8小块同时隐藏原始冗余水印及该块的均值信息。水印嵌入前先使用混沌序列对原始水印进行加密,接着结合新的算法性能评价函数寻找最优水印嵌入量化步长上下限;水印嵌入过程中根据图像块内容特性自适应选取最优嵌入量化步长。对比实验表明,随机四元组策略安全性高;算法水印透明性好,在抵抗图像常规区域攻击及其他类型攻击方面显示了较高的鲁棒性。To enhance the algorithm＇s ability of anti-regional attacks of digital images, a secure and highly robust digital watermarking algorithm is proposed. The concept of Random Quaternary Group （RQG） is introduced, and the RQGs of the host image are used to hide the original redundant watermark bits and the mean value of the 8 × 8 blocks of the RQGs. Before the watermark embedding process, the original watermark is encrypted by chaotic sequencee; the performance evaluation function of the proposed algorithm is applied to search the high and low limits of the quantization step of watermark embedding. In watermark embedding process, the algorithm is used to select the optimal quantization step adaptively according to the content of each block. Experiment results show that the RQG strategy is secure; the proposed method has good watermark transparency and high robustness resisting conventional regional attack and other attacks of digital images.

关 键 词：计算机应用 区域攻击 随机四元组 量化步长 水印透明性 鲁棒性 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]