离散小波变换(DWT)域的公有水印技术研究

Research on the Public Watermarking Technology Based on DWT

通过在现有的公有水印模型中引入混沌系统，提出一种新的基于离散小波变换（DWT）域的公有水印技术．该技术在水印嵌入时，由混沌系统生成水印序列，并在离散小波变换的低频子带上嵌入水印，保证了水印的鲁棒性．实验分析不同指数因子嵌入水印的性能，结果表明：当指数因子在0．1～0．2之间时，嵌入水印的鲁棒性能比较好．

By introducing chaos system in existing public watermarking model, a new public watermarking technology based on DWT is proposed. While embedding watermarking, the watermarking sequences are produced by the chaos system ,and are embedded into the low frequent coefficient of DWT domain to guarantee the robustness of watermarking. In the experiment, the performance of watermark against attacks using the different index factors is analyzed and the experiment results show that the robustness of watermark is better when the value of index factor is between 0. 1 and 0.2.