【作者】 肖芳；

【导师】 陈耀武；

【作者基本信息】 浙江大学 ， 电子信息技术及仪器， 2005， 硕士

【摘要】 随着多媒体通信的发展，人们迫切需要在传输语音的同时进行视频交流。目前采用pc机+摄像头模式的视频传输方法，体积笨重、操作复杂、价格昂贵，难以大范围应用。随着DSP技术和视频编解码标准的发展，兴起了基于嵌入式的视频传输系统。本文设计并实现了基于TI-DSP(DM642)的H.263视频解码与显示系统。该系统体积小、速度快、性价比高，能进行实时高清晰视频交流，具有广阔的应用前景和工程实用价值。 第一章论述了视频编解码技术、网络系统和DSP技术的发展。 第二章分析了视频压缩理论，着重论述了H.263标准的原理和整体框架，比较了H.261、MPEG-4和H.263之间的区别。 第三章对多款多媒体处理器和视频D／A芯片进行了选择和比较。以DM642为核心设计了系统的总体硬件框架，并对其中的各模块进行了分别论述。 第四章论述了该系统的软件平台。包括软件开发调试环境CCS、操作系统DSP／BIOS和软件开发的流程及工具。 第五章论述了该系统的软件设计和实现。对该系统的软件框架、操作系统、代码优化、驱动设计等都做了详细讨论。 第六章对该系统的功能、性能、稳定性做了测试。 第七章对该系统进行了总结，并对将来的应用前景进行了展望。更多还原

【Abstract】 With the development of multimedia communication, people need video communication as well as audio. The existing method using PC+camera is very complex and slow. The growing performance of DSP and the improvement of video codec technology give the realization base of embedded multimedia system.This paper designs and implements a system realizing the video decoder and display in the platform of TI-DSP (DM642), This system is very small and fast, it could let people communicate fluently in high definition image. This system has great reference value for wide application use.Chapter one describes the development of codec technology, DSP and network.Chapter two introduces the theory of video compression and analysis the H.263 recommendation in details, comparing it with H.261 and MPEG-4.Chapter three compares the difference among various multimedia processors and video D/A chips and then designs the function layout of the system based on DM642, giving the configuration of peripherals.Chapter four discusses the software platform including the code developing environment, the step of software design and the assembler & compiler tools.Chapter five presents the software framework, including the operation system, the code optimizing method and the device driver.Chapter six gives the test of the whole system about function, performance and reliability.Chapter seven summarizes the system and gives it’s meaning in general aspects.更多还原