基于小波的自适应图像数字盲水印算法  

A Adaptive Blind Watermarking Algorithm Based on Wavelet Transform

作　　者：赵彦涛[1] 苏凤燕[1] 李志全[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《计算机安全》2008年第9期26-29,共4页Network & Computer Security

摘　　要：该文提出一种在小波变换域自适应嵌入图像数字盲水印的新算法,在水印检测过程中不需要原始图像。首先根据三级小波的细节系数确定嵌入位置,利用系数间存在很强的相关性,在第二级小波的水平和垂直细节数据中,通过采用修改图像小波系数及其邻域系数的均值之间的大小关系来自适应的嵌入置乱后的水印,嵌入的强度由该处的边缘强弱确定,这样,能在水印嵌入的鲁棒性和不可见性方面达到很好的平衡。并且,小波嵌入的位置互不相邻,嵌入水印信息之间不会产生相互干扰,从而提高水印提取的质量。该算法实验结果表明,该数字水印算法能很好的抵抗附加噪声、裁减、有损压缩、滤波等各种攻击,具有较强的不可见性和鲁棒性。A new adaptive image watermark algorithm based wavelet transform is proposed, and Watermark detection is accomplished without using the original image. At first, the position of watermark, is embedded is finded, utilizing the correlation between the neighbors of wavelet coefficient, In the second lelvel detail subimage, a scrambled image is adjusted adaptively embedded into images by modifying the difference value between coefficients and the mean of theis neighbors, the strength of watermark, is obtained according to the edge. Thus a good balance between invisible and robust is achieved. The pixeles of the watermark fmbeded is not neighbors, so the information of imbeded can＇ t influence each other, so we can extract the good quality mark. from the watermarked image. Experimental result shows that this watermark algorithm Is invisible and robust against some image processing operations, such as addiribe noise, filter, compression, incorporating attacks and so on.

关 键 词：数字水印 小波变换 图像置乱 自适应 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TP391.4[自动化与计算机技术—计算机科学与技术]