混沌数字水印及其性能分析  

An Watermark Scheme Base on Chaos and the Performance Analysis

作　　者：练秋生[1] 王成儒[1] 

机构地区：[1]河北省秦皇岛燕山大学信息工程学院电子与通讯工程系,秦皇岛066004

出　　处：《仪器仪表学报》2002年第z3期157-159,173,共4页Chinese Journal of Scientific Instrument

摘　　要：提出一种在小波变换域嵌入混沌数字水印的新算法。混沌数字水印由 L ogistic映射产生。由于混沌序列对初值高度敏感 ,因此可利用的序列数量多 ,安全性能高。检测水印时将混沌水印序列与水印图像直接进行相关运算 ,不需要原始图像。文中对相关系数的统计特性进行了详细的理论分析。通过对水印图像进行各种退化处理的实验表明 ,提出的数字水印算法具有较好的鲁棒性。A novel algorithm of embedding chaotic digital watermark into wavelet transform domain is proposed.The watermark sequence is generated by Logistic sequence.There are plentiful secure chaotic sequences can be utilized because chaotic sequence is sensitive dependence on initial condition.Watermark detection is performed by computing the correlation coefficient between watermarked image and chaotic sequence without resorting to the original image.The statistical character of correlation coefficient is analyzed in detail.Experiment results show that the digital watermark algorithm is robust enough to image degradation process.

关 键 词：数字水印 LOGISTIC映射 混沌 小波变换 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]