用于图像认证的半脆弱双水印方案

【作者】 高帅；

【导师】 邵丽；

【作者基本信息】 首都经济贸易大学 ， 产业经济学， 2008， 硕士

【摘要】 数字水印技术是一种全新的信息安全技术,是多媒体版权保护和多媒体认证的强有力的手段,涉及到通信与信息理论、图像处理技术、网络安全等多种学科知识,极具学术价值和经济价值。半脆弱水印技术是数字水印技术的一个重要分支,它能容忍一定程度的常见信号处理操作,能检测出对多媒体数据是否有恶意篡改,可以定位篡改区域,甚至判断篡改方式以及恢复出被篡改的数据。本文比较系统地研究了半脆弱数字水印的发展情况,论述了认证水印(脆弱数字水印和半脆弱数字水印)的提出背景及概念原理和研究动态,重点分析了认证水印按空间域和变换域分类的各种算法,比较了它们的优缺点,总结了认证水印有可能受到的攻击行为。本文结合两种半脆弱水印算法,在同一图像中的小波域内进行多重嵌入,而又互不干扰,从而实现对图像组合目的或者多重目的的保护。通过大量实验,总结规律,得出特定攻击对图像的特征图表,从而更精确的分析分辨攻击类型并度量其篡改能力。更多还原

【Abstract】 Digital watermarking technique is a whole new mean to guard information security.It has been a strong method for copyright protection and authentication on multimedia.And it involves the theory on communication and information,digital image processing,network security and so on.It is of high academic value and economic value.Semi-fragile watermarking technique is an important branch of digital watermarking.It can tolerate general signal processing,detect any spiteful tamper on marked multimedia data,locate spatial regions within an altered image,and even can estimate what kind of modification had occurred and recover the tampered data.In this paper,the background,the concept,the general framework and the research trend of authentication watermarking(known as fragile watermarking and semi-fragile watermarking) technology is roughly described,the emphasis is on the analysis of authentication watermarking classified by the spatial and the transform domain,also their advantages and disadvantages are analyzed,in addition,common attacks applied to authentication watermarking are summarizedIn this paper,two kinds of semi-fragile watermark are embedded in a image in wavelet domain,which achieve the purpose of image composition authentication or multi-purpose protection.Through numerous experiments, the rules are summer up,so that there is a image charts about the attacks on the specific characteristics.In the same way,we can have a more accurate analysis distinguish types of attacks and distortion measure of its capacity.更多还原