基于小波系数块能量分析和混沌映射的水印算法

A Watermarking Algorithm Based on Block Energy Analysis of the Wavelet Transform Parameters and Chaotic Map

小波变换具有时频局部化特性和与人眼视觉特性相符的变换机制,而混沌序列具有确定、似随机、不可预测等特性。在对小波系数块能量分析的基础上,提出了一种基于小波系数块能量分析和混沌映射的水印算法。该算法具有一定的鲁棒性,并且抗破译性强。

The discrete wavelet transform （DWT）has a localized characteristic in time- frequency domain and a transform mechanism that accords with human visual system. And chaotic sequence has such attributes as certainty,random- like and unpredictable. Based on block energy analysis of the wavelet transform parameters, a watermarking algorithm is proposed which based on block energy analysis of the wavelet transform parameters and chaotic map. The algorithm is robust and the its resistance to the attack of cryptanalysis is better.