基于小波变换的图像复合加密新算法  

Digital Image Combining Encryption Algorithm Based on Wavelet Domain

作　　者：刘涛[1] 石智[1] 

机构地区：[1]西安建筑科技大学理学院,陕西西安710055

出　　处：《计算机仿真》2011年第12期256-259,共4页Computer Simulation

基　　金：陕西省自然科学基金(2009JM1002);陕西省教育厅专项科研基金(09JK539)

摘　　要：研究图像加密优化问题,水印预处理的重要内容是整个水印系统的稳健性、安全性和隐蔽性。传统的水印预处理多采用改变图像某些像素点坐标位置方法,往往形式单一,破解较易而且难以满足控制要求。针对上述问题,提出结合Arnold变换与Logistic混沌映射,对水印信息进行混合编码算法,通过小波变换分解载体图像,得到高频子带,将混合编码的水印信息嵌入高频部分,实现水印的嵌入与提取,经过仿真,表明改进算法不仅具有较好的不可见性和较强的鲁棒性,且易于实现,为多重水印信号的预处理提供了一种可行的方法。Pretreatment of digital watermarking is the key step in image encryption,which determines the stability and security of the whole watermarking system.Traditional method changes the location of the image coordinates of some pixels,form asingle,crack easilyand and can not get satisfied control effect.Based on the above issues,the paper describes a method of combining Arnold transform with Logistic chaos for digital watermarking based on wavelet.Carrier images were decomposed by wavelet transform,and the digital watermark was embed with the high-frequency of the decomposition coefficient.Simulation results show that the algorithm not only has good invisibility and robustness but is easy to implement,which providing a feasible method for multiple pretreatment of digital watermarking.

关 键 词：小波变换 数字水印 阿诺德变换 混沌映射 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论]