一种基于扩频机制的数字图像水印算法  

Digital Image Watermark Algorithm Based on Spread Spectrum Mechanism

作　　者：孙利杰[1] 赵景秀[1] 郑美珠[1] 高忠[1] 

机构地区：[1]曲阜师范大学计算机科学学院,山东日照276826

出　　处：《计算机工程》2011年第14期120-122,共3页Computer Engineering

基　　金：山东省自然科学基金资助项目(ZR2009GM009);山东省高校科技计划基金资助项目(J09LG34)

摘　　要：提出一种基于扩频机制的数字图像水印算法。用伪随机序列作为扩频码,对原始水印信息进行周期延拓扩频和加密,在考虑人眼视觉特性的基础上,确定扩频水印在平稳小波变换域的嵌入位置和强度,扩频序列的选取决定了所选用的小波变换域最大系数的个数以及水印的密钥序列。实验结果表明,该算法具有较强的鲁棒性。This paper proposes a digital image watermark algorithm based on spread spectrum mechanism. It selects the pseudo random sequence modulation for the periodic sequence of continuation, and then encrypts. Taking into account the characteristics of human visual system, the positions and strengths of embedding into the original image which uses the same chip rate coefficients of the stationary wavelet transform domain are obtained. Selecting spread spectrum sequence determines the maximum coefficients of the wavelet transform domain and the key period sequence of watermark. Experimental results show that the algorithm has strong robustness.

关 键 词：伪随机序列 周期延拓 平稳小波变换 扩频水印 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]