【作者】 石连传；

【导师】 张素文；

【作者基本信息】 武汉理工大学 ， 控制理论与控制工程， 2005， 硕士

【摘要】 随着科技的进步和人民生活水平的不断提高,视频监控系统在工业生产、国家安防、日常生活中得到了广泛的应用。视频监控技术融合了计算机、多媒体、通信及网络等多项技术,成为人们研究的热点之一,具有广阔的应用前景和研究价值。 本文在总结分析前人的研究成果的基础上,将先进的嵌入式技术、视频技术、网络技术有效地结合在一起,提出了一种嵌入式网络视频监控系统的设计方案。该方案分为前端服务器和远端监控两部分,在服务器端,完成图像的采集、转换、压缩编码及网络发送、文件刻录;在远端监控部分,负责视频数据的接收、解码显示、服务器控制。 本文主要采用嵌入式处理器PowerPC405和视频编/解码芯片VW2010作为硬件平台,嵌入式VxWorks操作系统做为服务器软件平台,进行前端服务器的设计开发。论文首先阐述了系统功能、硬件构架以及在嵌入式操作系统VxWorks上的编写设备驱动程序的原理和方法,给出了驱动框架,并设计了该系统所需要的驱动程序。然后详细介绍了服务器软件设计,在分析研究了目前网络传输的各种协议和方法的基础上,对视频数据网络传输中的重难点技术,如传输数据的连续性、准确性、网络阻塞、实时性等问题提出了解决方案:采用UDP、IP组播、RTP相结合实现视频数据传输,解决数据量大,容易网络阻塞的问题;采用TCP协议及时对监控视频进行网络控制,以保证连接和控制命令的准确传输;采用多任务机制和信号量通信机制提高系统实时性。文章接着给出了服务器软件的关键模块(视频数据发送模块、网络参数控制模块、文件刻录模块)的实现模型,分别对各个模块的关键技术进行了阐述,并给出了系统测试结果。 最后,文章对整个系统进行了总结回顾,提出系统的一些不足之处及下一步需要做的改进工作。更多还原

【Abstract】 The video monitoring system plays more an important role with the advance of the technology and the improvement of the life level. The video monitoring system technique has became one of people’s study hot, has vast of applied foreground and research value.In this paper, an embedded video monitoring system based on network was designed. This system has two parts: server part and remote monitoring part. Video image are collected, converted, compressed and sent to network in the server part. On the other hand, video data is received, decoded the image, and played in the client part.In this dissertation, This video monitoring system is developed based on high performance embedded processor PowerPC 405 , video decoder/encoder VW2010, and VxWorks embedded operate system. Firstly, the whole system design project is discussed in detail, including hardware&software design and system function. Then we elaborated the principle and methods of device driver on operate system VxWorks, and realized the device driver of our video monitoring system. Afterwards, aiming to the difficulties and emphases of the video monitoring such as transmission layers, real time and veracity, the thesis puts forward methods to resolve these problem based on discussing and analyzing stream media real time transfer protocol:UDP,IP Multicast, RTP method are combined together to deliver the video data in order to improve the rapidity of network deliver; The network control data transfer using TCP protocol assure the veracity; Multitask and semaphore mechanism are used to assure the real time.Additional, the key model (video data sending model,network control model and file model)of server software is given with the result of system test.At last, the main research conclusion is summarized. The prospect of further research is also proposed, made sure the target for the work of the aftertime.更多还原