城轨列车网络视频监控传输系统的研究

发布时间：2018-06-19 23:01

本文选题：视频传输 + 嵌入式Linux　；参考：《北京交通大学》2017年硕士论文

【摘要】：随着我国城市轨道交通规模的迅速扩大,选择使用城轨交通出行的人数越来越多,对其安全性的保障也越来越重要。视频监控作为一种有效的保障手段,已被大量应用于城市轨道交通中。然而,目前安装的监控系统大多是在车站内的闭路电视监控系统,为了能够使驾驶室内的驾驶员在列车运行时及时了解车厢内发生的突发情况,需要大力发展城轨列车视频监控系统。本文基于实际项目需求,设计并实现了一个基于嵌入式Linux的视频监控传输系统,并从系统的设计需求和方案分析、功能模块设计、系统实现和系统测试几个方面进行了详细阐述。论文首先分析总结了视频监控系统的发展历程和研究现状,介绍了设计中将要使用的软件平台和硬件设备。然后从用户需求出发,划分了设计的功能架构,将主要功能分为了数据传输模块和解码模块两个部分,同时提出了系统各模块的设计方案。数据传输模块设计部分主要研究了实时流传输协议(Real Time Streaming Protocol,RTSP)、实时传输协议(Real-time Transport Protocol,RTP)这两个实时流媒体传输协议,搭建了提供数据传输的通道,设计了 RTSP的消息传递流程和RTP的数据接收流程。解码模块设计部分主要研究了 H.264编解码标准,搭建了与设备通道相接的解码通道,介绍了网络提取层单元的传输顺序,设计了H.264解码过程中的拆包操作。系统实现部分利用了前面设计的各个功能模块中提供的信息和功能,实现了系统总体功能的设计。测试部分对测试系统的构成和测试方法进行了详细论述,并给出了抓包工具抓取得到的网络封包的结果和实际显示屏上显示的结果,验证了程序的设计的可行性和有效性。最终的测试结果表明,本论文中设计的城轨列车视频监控传输系统实现了对车厢内图像数据的采集传输和解码播放的功能,达到了预期的目标,可以在实际当中使用。
[Abstract]:With the rapid expansion of urban rail transit in China, more and more people choose to use urban rail transit, and the security of urban rail transit is becoming more and more important. As an effective safeguard, video surveillance has been widely used in urban rail transit. However, most of the monitoring systems installed at present are closed-circuit television monitoring systems in the station. In order to enable the drivers in the cab to keep abreast of the unexpected situation in the carriage while the train is running, It is necessary to develop video surveillance system of urban rail train. Based on the actual project requirements, this paper designs and implements a video surveillance and transmission system based on embedded Linux. The system implementation and system testing are described in detail. Firstly, this paper analyzes and summarizes the development history and research status of video surveillance system, and introduces the software platform and hardware equipment to be used in the design. Then according to the requirements of users, the functional framework of the design is divided into two parts: data transmission module and decoding module. At the same time, the design scheme of each module of the system is put forward. In the design of data transmission module, two real-time streaming protocols, Real time streaming Protocol (RTSP) and Real-time Transport Protocol (RTP), are studied. The message passing flow of RTSP and the data receiving flow of RTP are designed. In the design of the decoding module, the H.264 codec standard is studied, the decoding channel connected with the device channel is built, the transmission sequence of the network extraction layer unit is introduced, and the packet unpacking operation in the H. 264 decoding process is designed. The system implementation part uses the information and function provided in each function module of the previous design to realize the design of the overall function of the system. In the test part, the composition and testing method of the test system are discussed in detail, and the results of the network packet grab and the actual display screen are given, which verify the feasibility and effectiveness of the program design. The final test results show that the video surveillance and transmission system of the city rail train designed in this paper realizes the functions of collecting and transmitting image data and decoding and playing the image data in the carriage, and achieves the expected goal, which can be used in practice.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN948.6

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