导　　师： 陈俊杰

学科专业： H1203

授予学位： 硕士

作　　者： ;

机构地区： 太原理工大学

摘　　要： 未来社会对视频监控系统的发展有着越来越紧迫的需求。随着嵌入式技术的出现、图像压缩技术的提高和网络传输技术的提升，现行的视频监控系统主要围绕嵌入式系统进行开发和部署。嵌入式视频监控系统也以其高密集型、高可靠性、高复用性等特点得到越来越多的重视。因此设计并实现基于嵌入式的视频监控系统是非常有意义的工作。 本课题的目的是利用 arm+dsp 双核结构的嵌入式处理器tms320dm270为核心，搭建一个完整的嵌入式开发平台；并利用该平台建立基于mpeg4视频压缩技术以及标准的流媒体传输协议rtp/rtsp的嵌入式视频监控系统。在分析视频监控系统应用实际的基础上，设计出嵌入式视频监控系统的整体方案，并对各个子系统的功能进行设计与实现。整个系统由硬件和软件两大模块构成：在硬件方面采用了德州仪器(ti)发布的tms320dm270双核嵌入式音视频开发平台；在软件方面主要由嵌入式操作系统、嵌入式流媒体服务器、嵌入式web服务器以及客户端监控软件组成。 嵌入式视频监控系统离不开嵌入式操作系统的支持，为了能够充分利用开发板上的有限资源，一个稳定、高效的嵌入式操作系统是必不可少的。 课题首先采用源代码开放的嵌入式linux，根据开发板实际的硬件资源实现了嵌入式linux操作系统的正常运行；随后在开发板上实现了双核处理器arm和dsp之间的通信，并以api的形式提供mpeg4编解码算法，实现了嵌入式开发平台上利用mpeg4视频编解码算法对实时音视频的压缩和解压缩；进而在操作系统之上，利用标准的流媒体传输协议rtp/rtsp以及标准的http协议，在tms320dm270开发板上搭建了网络流媒体服务器和嵌入式web服务器，实现了音、视频数据在网络上的实时发送和接收，以及在b/s架构下客户端对嵌入式视频监控系统的实时访问和控制。整个设计综合应用了嵌入式系统开发、流媒体协议以及网络协议等技术，使开发出的嵌入式视频监控系统具有技术先进、性能良好、功能完善、通用性强、成本低廉的特点，能够快速应用于相关领域的视频监控系统，实用价值较高。 The application of video surveillance system is needed widely in the future. With the appearance of embedded technology, the development of image compression technology and the improvement of network transmission technology, video surveillance system now are mainly developed and deployed with embedded system. Also people pay more attention to embedded video surveillance system because of it's high integration、high reliability and low cost. Therefore, it is absolutely significant for us to design and implement video surveillance system based on embedded system. This paper adopts ARM+DSP dual embedded processor TMS320DM270 develop board as target to build up an integrated embedded OS platform; furthermore realize an embedded surveillance system based on the MPEG4 and standard streaming media transmission protocol /(RTSP//RTP/) . Firstly we do some research on actual application for video surveillance system, then design the whole project about embedded video surveillance system, finally we implement every part of this system. The system includes two parts: hardware and software. In the part of hardware we adopt Texas Instrument's TMS320DM270 dual micro-processor embedded audio//video development platform; Software mainly includes embedded OS, embedded streaming media server、embedded web server and client management software. Embedded OS is necessary for embedded video surveillance system. A stable and high effective embedded OS is necessary to make full use of limited resource on embedded development board. Firstly, this paper ports open-source embedded Linux to the TMS320DM270 development platform; Secondly, we implement the communication between ARM and DSP, meanwhile give the MPEG4 encode//decode algorithm in form of API on the embedded development platform to encode//decode live audio//video; Finally, we build up two servers—steaming media server/(based on the standard protocol of RTSP//RTP/) and embedded web server/(based on the standard protocol of HTTP/) above the embedded OS on the TMS320DM270, furthermore we make the TMS320DM270 development platform have ability to compress and uncompress live audio//video, send and receive audio//video data on the IP network, also multiple clients can access and control this embedded video surveillance system under the architecture of B//S. This system integrates the technology of embedded system development、steaming media protocol and network protocol, so the embedded video surveillance system that we design and implement have various advantages: advanced technology, well performance, perfect function, low cost and so on. It can be applied on far-ranging area in a short time.

关 键 词： 嵌入式系统 嵌入式 视频监控系统 视频压缩 流媒体传输 传输协议 数字信号处理器

分 类 号： [TN919.81 TP368.1]

领　　域： [电子电信] [电子电信] [自动化与计算机技术] [自动化与计算机技术]