一种新的混合数字水印算法

采用离散余弦变换来实现水印的嵌入和提取．在对低、中高频率水印算法的研究和实验基础上，提出了一种新的混合数字水印算法，在这一算法中，每个频域中被嵌人了多个水印．采用了八个不同的攻击方法来测试三种算法的鲁棒性．实验结果表明，混合算法利用了水印在各个频域的特性，相比较与其他两种算法有着更好的性能．

A Novel Mixed Digital Watermark Method

The discrete wavelet transformation is adopted to implement the watermark embedding and extraction. After some researches and experiments on the algorithms in low, middle and high frequencies, a novel mixed watermark method is proposed, in which multiple watermarks are embedded into every frequency domain. Eight different attack ways are used to test the robustness of three given watermark algorithms. Three experiments are carried out, and the results show that the mixed method takes advantage of the properties of watermarks in each frequency, and has the better performance than the other two algorithms.