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硕士论文 基于TMS320DM642的视频图像处理技术研究 摘 要 本文以TMS320DM642为核心的TDS642EVM评估板作为硬件开发平台,主要研究了对视频图像的编码压缩及加密技术。
在视频压缩编码部分,论文选用H.264编码标准作为研究对象,分析了H.264的编码原理及主要技术,结合DM642的特点对开源的X264编码器进行了DSP平台的移植,并从项目级、C语言级、线性汇编级等层面对算法进行了优化。
经测试,优化后的编码器实现了对CIF格式视频的实时编码压缩。
然后利用TI提供的网络开发包实现了编码后视频图像从评估板到PC的网络传输及存储,构建了完整的网络摄像平台。
在视频加密部分,论文结合视频加密的要求分析了现有视频加密算法的性能,研究了一种针对H.264的混沌加密算法,根据该算法设计加密方案并对其进行了仿真。
方案使用Logistic映射产生的伪随机序列生成两组密钥,分别对帧内预测模式、变换量化后的系数、运动矢量等部分选用不同密钥进行加密。
仿真结果表明,该算法具有较高的安全性和实时性,对编码压缩性能影响较小,具有一定的数据可操作性,能够较好满足视频数据加密的要求。
关键词:TMS320DM642,视频压缩,视频加密,H.264,混沌密码 硕jt论文 Abstract In this paper,the Evaluation Board TDS642EVM which takes the TMS320DM642 coreis chosen as a hardware development platform to do the research of video compression andencryption coding. IIl the part of video compression encoding.the H.264 coding standard is selected as theobject of study.In the paper,H.264 coding principle and the main technical has been analyzed.Combined with the characteristics of DM642,the open-source X264 encoder is transplantedto the DSP platform.Further more,the algorithm is optimized from the project level,Clanguage level and linear assembly level.After testing,the optimized encoder has realized thereal—time coding compression to the video form CIF.And then the Network Developer’S Kitprovided from TI is used to realize network transmission and storage of the encoded videofrom the EVM to PC,building a complete platform of network camera. In the part of video encryption,taking the requirements of video encryption into account,the thesis analyzed the performance of the current video encryption algorithm and studied aalgorithm of chaotic encryption for the H.264.According to this algorithm we designedencryption scheme and carried on the simulation.The pseudo—random sequence which isgenerated by the Logistic mapping produces two groups of keys,which encrypt inintra—prediction mode,the coefficient after the transform and quantization,the mot