基于混沌理论的视频加密系统研究.docVIP

分类号： TN219 密 级： U D C： 编 号： 基于混沌理论的视频加密系统研究 RESEARCH OF VIDEO ENCRPYTION SYSTEM BASED ON CHAOTIC THEORY 学位授予单位及代码：长春理工大学 10186 学科专业名称及代码：模式识别与智能系统 080300 研 究 方 向：模式识别与图像处理 申请学位级别：硕 士 指 导 教 师：柏逢明 教授 研 究 生：王俊平 论文起止时间：2007.11—2008.12 摘 要 随着多媒体和计算机网络技术的发展，多媒体视频应用的范围扩展到经济、军事、政治、教育等各行各业。与此同时，当视频内容涉及到国家机密、个人隐私时，人们又总是希望视频信息能够必威体育官网网址传输，诸多敏感场合对必威体育官网网址性和安全性的要求，激励了对视频信息加密算法的研究。 本文根据混沌映射和视频压缩标准H.264的原理和特点，提出了一种基于混沌的安全级别可调的视频加密算法。该算法首先利用混沌函数产生加密序列，然后根据安全级别对运动向量、预测模式字以及DCT系数加密，此算法在H.264参考软件JM10.2上加以实现。通过分析和实验结果表明，上述算法达到了理想的加密效果。 另外，本文又结合提升小波和混沌理论，提出了一种基于混沌和提升小波的视频加密算法。该算法选择小波分解后的低频子带纹理块进行加密，通过试验验证了该算法的可行性。 关键词：视频加密 混沌 H.264 提升小波 ABSTRACT With the development of multimedia and network technology, the application scope of multimedia video is expanding to almost every walk of life such as economy, military affairs，politics，education and so on. Meanwhile, when the contents of video concern national secret or personal privacy, they may need to be transmitted with the protection of encryption.The demand for secrecy and security in the sensitive situations has accelerated the research of video information encryption algorithm. According to the principles and features of chaos and the video-compression standard H.264, the thesis brings forward a video encryption algorithm which the safety level is adjustable. First of all, the algorithm generated a encryption sequence by chaostic function, and then encrypted of campaign vectors, forecasting models, as well as DCT coefficient based on the security level. This algorithm was achieved in H.264 reference software JM10.2. Through the experimental results analysis, the encryption algorithm achieves the desired effect of encryption. In addition, a new encryption algorithm based on lifting wavelet and chaos theory is put forward, the algorithm chooses low-frequency sub-band texture block after the wavelet decompositi