摘要
利用图像经CARDBAL多小波分解后,不同尺度、不同方向的分量能量平均分配于四个子图这一特点,通过调整这四个子图中系数的标准差来嵌入二值图像水印;提取水印后,通过比较提取水印与原始水印差异图局部与整体TAF值的差异来区别篡改和未篡改区域,实现篡改定位。实验结果表明,算法不但保证了含水印图像有较高的不可感知性,且对常见的几种处理具有较好的鲁棒性,较好的实现了图像的内容认证。
A semi-fragile watermarking scheme based multiwavelet is proposed.Because after CARDBAL multiwavelet transform,the energy of the each resolution subimage of an image will spread in average among its four components.Our scheme modifies the standard deviation of the 4 resolution subimages,according to a sequence of information bits.And we realize the blind watermark detection.Experimental results show that the proposed scheme is robust against normal image processing and attacks and is good for image authentication.
出处
《价值工程》
2011年第4期182-184,共3页
Value Engineering
关键词
半脆弱数字水印
多小波
标准差
图像认证
semi-fragile watermarking
multiwavelet
standard deviation
image authentication
