无线通讯可视终端中的视频软件设计和优化实现

【作者】 余建；

【导师】 陈耀武； 周凡；

【作者基本信息】 浙江大学 ， 电子信息技术及仪器， 2007， 硕士

【摘要】 随着计算机技术和微电子技术的不断进步，视频处理与应用技术也有了迅速发展。本文论述了基于DSP的视频软件设计和优化实现，主要包括视频编解码设计和视频输入输出设计。系统支持无线通讯可视终端自适应纠错，多窗口显示等功能。第1章阐述视频相关技术、发展背景、国际视频压缩标准、无线网络规范，以及嵌入式系统的现状和发展。第2章介绍ADSP-BF561的外设、内部结构、存储结构和开发环境。第3章概述系统设计，包括硬件和软件框架设计。第4章着重论述基于DSP平台的编解码软件设计。整个编解码方案是基于ITU-T的H.263+以及ISO／IEC的MPEG-4视频压缩标准的实现。分别对编码器和解码器进行详细设计，并对部分模块进行优化。在视频编解码器中添加纠错设计，使对丢包丢帧的错误可以有效隐藏及恢复；结合视频前、后处理设计，提高图像的整体显示效果。第5章详细说明视频输入输出软件设计。输出支持PAL／NTSC制式和八种显示模式。第6章概述DSP双核之间的通讯设计，和系统的联合调试。第7章总结论文所做工作并对未来研究做了展望。更多还原

【Abstract】 With the progress of computer and micro-electronics technology, the technology of video application has been advanced a lot. This dissertation discusses the design and the optimization of a video software system, which is based on a DSP platform. It includes mainly video codec, video input and output design. The video system supports good error concealment and recovery, and has multi-window display function.Chapter 1 presents video related technology, background, international video coding standard and wireless protocol.Chapter 2 introduces the peripheral, core architecture, memory architecture and IDDE of ADSP-BF561.Chapter 3 describes the whole system design, including hardware and software framework design.Chapter 4 discusses the video codec software design on DSP platform. It describes the encoding and decoding design in detail and gives some example of optimization. The design project is the realization of H.263+ and MPEG-4 video coding standard. It also adds error concern module in video coding which deals with packet or frame missing errors, and improves image display by adopting preprocessing and post processing design.Chapter 5 discusses the video input and output design, which support PAL/NTSC pattern and eight display mode.Chapter 6 introduces communication between dual cores of DSP, and system debugging.Chapter 7 concludes the research of this dissertation and proposes future development possibilities.更多还原