基于小波变换和混沌序列的频域图像加密-本科毕业论文终稿.doc

河南农业大学 本科生毕业论文 题 目 基于小波变换和混沌序列的频域 图像加密 学 院 理学院 专业班级 电子信息科学与技术10级（4）班 学生姓名 甘晓慧 指导教师 李宝方 撰写日期： 2014 年 5 月 15 日 基于小波变换和混沌序列的频域图像加密 甘晓慧 摘要 随着信息技术的发展，信息安全问题越来越受到更多的关注，如何维护信息安全，特别是图像信息安全，已成为众多研究者研究的课题。图像数字水印与图像加密是图像信息安全的有效保护措施。由于数字图像具有其自身的特点，许多研究者为了提高图像加密的效率和安全性，提出了一些频域图像加密方案，在这些方案中，基于小波与混沌的图像加密方案表现出了良好的加密特性。 目前的图像加密算法很多是在空域中进行加密。根据混沌序列以及小波变换的优良特性，将混沌和小波变换引入到数字图像加密算法中，实现图像的频域加密，使得加密的安全性得到提高，加密效果将会更好。 本文在前人研究工作的基础上，利用小波分析和混沌理论相结合的方法对图像加密开展深入的研究，主要取得如下成果: （1）（2）（3）Frequency domain image wavelet transform and encryption based on Chaotic Sequency GAN Xiao-hui Abstract With the development of information technology. The problems of information security get more attention. How to maintain the information security, especially the image of information security, which has become a hot topic for many researchers. The image digital watermarking,image encryption,etc, which are the effective protection measures of the information security. Because of the digital image have its own characteristics. Many researchers put forward to some image encryption schemes in order to improve the efficiency and safety of image encryption. In the schemes,the image encryption scheme based on chaotic that shows good characteristics of encryption. Current image encryption algorithm often simply on Spatial Domain . Based on chaotic sequences and the good characteristics of wavelet transform, and then introduce the chaos and wavelet transform into digital image encryption algorithm, to achieve the Frequency Domain image encryption. Make the safety of encryption improve, and encryption effect will be better. On this basis, the application of wavelet analysis and chaos theory on image encryption of the study to obtain the following results: (1)Using wavelet image compression algorithm based on wavelet multiscale