一种兼具版权保护及窜改认证双重功能的数字水印算法  

Dual digital watermarking algorithm for copyright protection and tamper authentication

作　　者：杨钒[1] 薛模根[1] 崔松[1] 王硕[1] 

机构地区：[1]解放军炮兵学院,合肥230031

出　　处：《计算机应用研究》2009年第8期3050-3052,共3页Application Research of Computers

摘　　要：针对目前较多数字水印功能单一的不足,提出了一种新的具有双重功能的数字图像水印,首先在原始图像的小波中频区域中,通过比较中心系数与邻域系数均值关系来嵌入版权水印;其次在低频区域中自适应地嵌入半脆弱水印作为认证水印,实现版权保护和窜改认证的双重功能。两种水印的检测和提取都不需要原始图像。采用常规的图像处理操作和恶意窜改操作进行实验,结果表明,该方法透明性好,版权保护水印对JPEG压缩、裁剪、噪声等攻击抵抗力强,内容认证水印能够精确地定位窜改,具有很好的应用前景。This paper presented a new dual digital image watermarking. Firstly embedded copyright watermark according to comparing the relationship of center and adjacented coefficients in tbe DWT middle-frequency coefficients of original image, then adaptively embedded the semi-fragile watermark into intermediate frequency domain of the original image. Both of watermarks could be detected and extracted from the watermarked image without the original image. Experimental results show that the method has good invisibility, copyright watermark is robust against normal image processing and kinds of attacks, for example JPEG compression, cutting, adding noise, authentication watermark can detect the location of any minute changes in images, and can be widely used in practice.

关 键 词：双水印 版权水印 认证水印 盲检测 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]