车载视频监控定位终端设计

发布时间：2018-02-27 02:36

本文关键词： 车载视频压缩视频传输 H.264 数据打包 GPS/北斗　出处：《郑州大学》2014年硕士论文　论文类型：学位论文

【摘要】：近几年来，由于城市交通的快速发展，公交系统越来越重要，它已经组成人们出行的重要方式。如何提高公交管理与监控力度成为了重中之重。随着3G与4G技术的发展，移动互联网带宽越来越宽，稳定性越来越高，这就为视频的传输提供了移动网络媒介。并且视频压缩技术也在迅速发展，建设一个稳定可靠的移动互联网视频传输系统成为了可能。本文首先分析了国内外车载视频监控定位终端的概况与差距，考虑到车载终端的移动性，采用3G网络来传输视频与定位数据，使用最新的视频压缩编码标准H.264，在减小视频数据量的同时也减小了3G网络数据的流量。其次根据系统需求搭建起Linux操作系统，，详细介绍了相关模块的驱动程序的编写、修改与移植的实现过程。之后深入分析网络传输协议与视频压缩格式，根据两者的特点设计压缩视频流的RTP封装算法。车载终端建立UDP客户端，对获取到的压缩视频流进行RTP协议的封装，然后通过无线网络将封装过的数据发送至监控中心。同时建立一个TCP客户端并从串口获取定位信息并将GPS/北斗模块的定位信息使用TCP协议经3G网络传输至监控中心。最后编写一个监控中心模拟软件进行系统的验证。监控中心建立一个UDP服务器来接收H.264压缩视频数据，建立一个TCP服务器接收北斗/GPS定位数据。软件可以显示定位信息并自动生成一个播放配置文件来播放收到的H.264实时视频。实验结果表明该车载终端可以通过3G网络、wifi、有线网络将数据发送至监控中心并且效果良好。本文的重点是RTP数据协议与H.264视频压缩格式之间的结合，也就是如何使用RTP来封装H.264压缩视频流。通过网络抓包工具抓包与H.264文件分析工具数据对比，可以看出原始H.264文件数据与网络打包数据一致，验证了H.264压缩视频流的RTP封装算法的正确性。
[Abstract]:In recent years, due to the rapid development of urban traffic, the public transport system is becoming more and more important. It has become an important way for people to travel. How to improve the management and monitoring of public transport has become the top priority. With the development of 3G and 4G technology, The bandwidth and stability of the mobile Internet are becoming wider and wider, which provides a mobile network medium for the transmission of video, and video compression technology is also developing rapidly. It is possible to build a stable and reliable mobile internet video transmission system. Firstly, this paper analyzes the general situation and gap between domestic and foreign vehicular video surveillance and positioning terminals. Considering the mobility of vehicle terminals, 3G network is used to transmit video and positioning data. Using the latest video compression coding standard H.264, it not only reduces the amount of video data, but also reduces the traffic of 3G network data. Secondly, the Linux operating system is built according to the requirement of the system, and the driver program of the related module is introduced in detail. After analyzing the network transmission protocol and video compression format, the RTP encapsulation algorithm of compressed video stream is designed according to their characteristics. Encapsulate the obtained compressed video stream with RTP protocol, Then the encapsulated data is sent to the monitoring center via wireless network. At the same time, a TCP client is established and the location information of the GPS / Beidou module is obtained from the serial port. The GPS / Beidou module location information is transmitted to the monitor through the 3G network using the TCP protocol. Finally, we write a simulation software to verify the system. The monitoring center establishes a UDP server to receive H.264 compressed video data. The software can display the location information and automatically generate a playback configuration file to play the received H.264 real-time video. The experimental results show that the vehicle terminal can use 3G network. Wired network sends data to the monitoring center and works well. This paper focuses on the combination of RTP data protocol and H.264 video compression format, that is, how to use RTP to encapsulate H.264 compressed video stream. It can be seen that the original H.264 file data is consistent with the network packet data, and the correctness of the RTP encapsulation algorithm of H.264 compressed video stream is verified.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U463.6;U495

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