【作者】 王晓慧；

【导师】 周东辉；

【作者基本信息】 中国海洋大学 ， 信号与信息处理， 2006， 硕士

【摘要】 AVS(Audio Video Coding Standard)标准是我国自主制定的数字音视频编解码技术国家标准。其中AVS的第七部分——移动视频(AVS-M)标准是为了数字存储媒体、网络流媒体、多媒体通信等应用中,针对运动图像压缩技术的需要而制定的。本文首先分析了课题背景和发展现状,简单比较了几种宏块分割模式算法的特点和解码器DSP优化方法。然后分析研究了AVS-M编解码器的结构和核心算法,将改进的人眼对比灵敏度模型应用到编码器的帧间预测宏块模式选择算法中,得到该算法的快速算法并在PC平台上验证,使编码器在保证视觉质量的前提下,速度提高了53%。本文又将解码器源码wm2.4移植到TMS320C6416 DSP平台之上,在正常运行的前提下,应用C语言优化、汇编优化、存储器优化和本设计提出的针对插值算法结构的优化这几种方法,使QCIF格式的最终解码速度是优化前的3倍多,达到46帧/秒,满足了实时要求。更多还原

【Abstract】 AVS (Audio Video Coding Standard)is the standard of video and audio designed by our country. Seven parts of AVS–Mobile Video (AVS-M) is designed for compressing moving images of digital storage, network stream, multimedia communication.In this paper the background and the status of the research are analyzed firstly. Several algorithms of the choice of macro block partition modes and methods of DSP optimization are showed briefly.Then structure and algorithms of the AVS-M encoder and decoder are analyzed .In the encoder, the vision model is used in the algorithms of the choice of macro block partition modes. The fast algorithm is applied in encoder on PC ,the speed has been improved by 53% and the effect is good.Then the decoder source code-wm2.4 is repotted on TMS320C6416 DSP . The optimizations of C code, assembly language , storage space and the structure of interpolation algorithm are used to the decoder, and the results of every method of optimization have been got. As to QCIF the final result is three times as fast as the repotted one. It has met the real time need.更多还原