基于DWT-SVD的图像双零水印算法

算法采用双零水印方式，解决不同的数字水印算法问题。首先，利用SVD空间向量表征图像的结构特性的性质解决了以往算法虚警率高的问题。其次，针对嵌入式数字水印算法的鲁棒性低以及嵌入容量有限等问题，提出了一种基于小波变换域的零水印算法，该算法利用小波变换系数构造出能够代表水印信息的特征值，同时算法对原始水印数据进行了双重加密，不仅达到隐藏水印信息、保护版权的目的，而且大大提高了水印信息的安全性。由于算法采用的是零水印的方式，所以能够保证原始载体图像无失真，即良好的不可见性。实验结果表明，该算法具有鲁棒性高、简单易行、虚警率低的优点。

A DWT-SVD based double-zero-watermarking algorithm

An algorithm is proposed,which uses double-zero-watermarking to solve problems of different digital watermarking algorithms.Firstly,the algorithm takes advantage of the characteristics of the SVD to solve the problem of the high rate of false alarms in existing algorithms.Secondly,according to the low robustness and the limited capacity of the embedded digital watermarking algorithm, a zero watermarking algorithm based on wavelet transform domain is proposed.The algorithm constructs new data which represent the watermark data by certain keys and wavelet transform coefficients.The original watermark data also carry on the multiple encryptions.The algorithm not only achieves the goal of hiding watermark and protecting copyright,but also greatly improves watermark security. Because the algorithm uses the double-zero-watermarking way,the handled image is not distorted,that is to say,it has good invisibility.Experimental results show that the proposed algorithm is simple and easy, with good robustness and low rate of false alarms.