摘要
数字水印是数字作品版权保护的重要技术手段。该文提出了一种基于Hadamard变换域的盲水印算法,利用边缘检测来确定分块对应的水印强度因子,并通过在分块Hadamard变换域中修改中频系数来嵌入水印。实验结果表明,该算法对常用的图像处理如JPEG压缩、加噪、剪切和滤波等攻击具有较好的鲁棒性。同时运算速度也较基于DCT的方法,有明显提高。
Digital watermarking is a key technique for protecting intellectual property.This paper proposes a blind image algorithm based on Hadamard transform. With the edge detection the algorithm the scheme decides the watermark's intensity factors of blocks and insert watermark by modifying the block Hadamard transform middle frequency coefficients.The experiment results show that the proposed method has very strong ability of sustaining common image processing operations such as JPEG compression、noise adding、clip...
出处
《杭州电子科技大学学报（自然科学版）》
2009年第1期67-70,共4页
Journal of Hangzhou Dianzi University：Natural Sciences
关键词
图像水印
哈达玛变换
边缘检测
嵌入提取时间
image watermark
Hadamard transform
edge detection
insertion and extraction times
