基于DWT和SVD的数字水印算法  

An Algorithm of Digital Watermarking Based on DWT and SVD

作　　者：汤震浩[1] 雍士华[1] 马小虎[1] TANG Zhen-hao, YONG Shi-hua, MA Xiao-hu （School of Computer Science and Technology, Soochow University, Suzhou 215006, China）

机构地区：[1]苏州大学计算机科学与技术学院,江苏苏州215006

出　　处：《电脑知识与技术》2009年第9期7208-7210,共3页Computer Knowledge and Technology

摘　　要：为了使水印算法具有更强的鲁棒性，提出一种基于离散小波变换（DWT）和奇异值分解（SVD）的数字水印算法．在水印嵌入之前首先对其进行调制。利用种子序列按照水印的大小生成一组随机数，并将这组随机数和原始水印图像进行调制．然后将调制后的水印嵌入到原始载体图像的离散小波域中。在水印提取时再利用调制过程的逆过程恢复出水印。实验结果证明了该方法对于JPEG压缩、噪声、旋转、剪切等具有很好的鲁棒性。An algorithm of digital watermarking based on DWT and SVD is proposed to improve the robusmess of digital wartermarking. Before watermarking embedded into the host image, we first modulate it, that is to generate a group of random numbers according to the size of watermarking using the seed sequence and modulate them with the watermarking. Then the modulated watermarking is embedded into the DWT domain of host image. We get the extracted watermarking by the inverse course of the embedding. Experimental results have demonstrated that the proposed approach is robust against common signal processing such as JPEG compression, noise, rotation and cropping.

关 键 词：数字水印 离散余弦变换 奇异值分解 

分 类 号：TP391[自动化与计算机技术—计算机应用技术;自动化与计算机技术—计算机科学与技术]