一种基于离散余弦变换和奇异值分解的数字水印算法

Watermarking Algorithm for Digital Image Based on DCT and SVD

提出了一种新的基于离散余弦变换和奇异值分解的水印算法,其所嵌入的水印图像是灰度图像,增加了嵌入的信息量,能够满足数字水印系统的透明性和鲁棒性要求.在该方法中,置乱技术用于水印图像隐藏的预处理和后处理,更加保障了数据的安全性.实验结果表明,该算法对于JPEG压缩、噪声等具有鲁棒性,尤其对于几何攻击如旋转、剪切等具有很好的鲁棒性.

A novel watermarking algorithm for digital image based on DCT and SVD is proposed in this paper. The embedded watermarking images are gray images, thereby increasing embedded information capacity. The algorithm can satisfy the transparence and robustness of the watermarking system. In the scheme, scrambling technology is used as preprocessing and post-processing of watermarking image information hiding, and it also well guarantees the safety of data. Experimental results have demonstrated that the proposed approach is robust against the common signal processing such as JPEG compression and noise. In particular, it is also robust against geometric attacks such as rotation and cropping.