用于图像认证的小波域双重脆弱水印算法研究

摘要

Aiming at problems of wavelet domain fragile watermarking image authentication algorithm being nonresistance to the vector -quantization attack and with high False Alarm Probability(FAP) and Miss Alarm Probability( MAP), a wavelet domain double fragile watermarking algorithm is proposed in this paper. Firstly, the image is divided into many sub-blocks, and a block-dependent mapping table is created; then each sub-block is executed the lwp2, and watermark is created using the Logestic Chaos system with the LL; Last,the watermark is embedded into its correlative sub-block's HL and LH. Experimental results show that the algorithm not only resists well the vector quantization attack, but also has lower FAP and MAP, and does well in image authentication.%针对当前小波域脆弱水印图像认证算法不能有效抵抗矢量量化攻击以及虚警率和漏警率较高的问题,基于混沌理论和块相关策略,提出一种小波域双重脆弱水印图像认证算法.算法首先对载体图像分块并建立块相关映射表;再对每一图像块作一级整数提升小波变换,利用 Logestic 混沌系统生成基于近似子带 LL 特征的水印信号;最后将水印信号分别嵌入相关图像块的细节子带 HL 和 LH.实验结果表明,该算法不仅能很好地抵抗矢量量化攻击,而且具有较低的虚警率和漏警率,能很好地实现图像完整性认证功能.