一种有关DWT与SVD相结合的多功能水印新方案

New Multi-function Watermark Scheme Based on DWT and SVD

提出了基于DWT和SVD相结合的多功能数字水印算法,主要用于图像版权保护和图像认证。该算法选取奇异值量化的方法分别嵌入鲁棒性水印和脆弱水印,鲁棒性水印主要用于适用于图像版权保护,脆弱水印主要用于检测图像被篡改的位置。在该方案中,采用分块双重置乱技术用于水印图像隐藏的预处理,以保障水印的安全性。实验结果表明,该算法不仅对JPEG有损压缩、中值滤波、剪切、低通滤波等各种图像降级处理有很强的稳健性,同时对图像篡改位置进行精确的检测,以抵制抗擦除或伪造易损水印的攻击。

Proposes a multi-function digital watermark algorithm based on Discrete Wavelet Transformation（DWT） and Singular Value Decomposition（SVD）,which is mainly used for image copyright protection and authentication.A new algorithm with the method of embedding the robust watermark and fragile watermark into the singular value is proposed.Robust watermarking is mainly used for image copyright protection,fragile watermarking is mainly used for detecting location of the image which has been tampered.In the scheme,Duple scrambling technology is used as pre-processing watermarking image information hiding,so that safeguarded the watermark security.Experiments and attack testing show that the algorithm is strongly robust to different types of attacks such as JPEG compression,median filter,cropping,Gaussian low-pass filtering and so on.At the same time it can indicate the locations that have been modified,so that can robust to erase or forge fragile watermark.