摘要
利用中频DCT系数接近0的特征,提出了一种通过对称修改单个中频系数实现嵌入二值图像水印的方案。首先将水印图像进行Arnold变换,然后根据变换后水印像素值为1或0将宿主图像中频系数修改为绝对值相等的正负数,提取水印时只需判断相应系数的正负即可,提供过程不需原始图像参与。实验结果表明,该算法对于常见的图像攻击具有较好的鲁棒性。
With the property of DCT intermediate coefficients that approximately equal to zero, this paper proposes a 2-bit image watermarking embedding algorithm by modifying only a block DCT intermediate coefficient symmetrically. Firstly, the watermarking image needs to be processed with Anorld transforming and then modifying some block DCT intermediate coeffidents based on ＂1＂ or ＂0＂. The oover image is not needed when extracting watermarking data. The experiment results show that the algorithm has good robusmess on oonventional image processing.
出处
《山西电子技术》
2006年第3期57-58,93,共3页
Shanxi Electronic Technology
关键词
数字水印
离散余弦变换
盲检测
digital watermarking
discrete cosine transform
blind testing
