基于嵌入式的远程视频监控系统的设计与实现

发布时间：2018-07-27 09:25

【摘要】：随着IT技术的发展,视频监控系统在日常生活中越来越重要,它不仅有利于维护公共安全和公共财产,而且对于违法犯罪行为起到了威慑的作用,为构建文明、和谐、法制的社会起到了不可或缺的作用。实际应用过程中,基于嵌入式技术的视频监控系统凭借着其功能全面、功耗低、体积小和灵活性好等优势,在视频监控中占有着一席之地,并在生活中广泛使用。本文设计了一种基于嵌入式技术的远程视频监控系统,该系统选用内核为ARM920t的S3C2440平台作为硬件基础,使用Linux操作系统提供软件支持,结合网络传输技术进行数据传输。先针对系统的功能模块进行划分,并建立实验开发环境平台,进而根据要实现的功能提出整个系统的设计方案。本次设计由服务器端和客户端构成整体设计架构,服务器端使用V4L2(video 4 linux2)技术对USB(Universal Serial Bus)摄像头拍摄的视频进行采集,并把数据压缩成MJPEG(Motion Joint Photographic Experts Group)格式,压缩的数据通过网络传输到客服端,接收到的视频进行格式转换及显示,最终达到远程监控的目的。这种设计方法构建了C/S(Client/Server)架构的远程监控系统,能够通过轮询机制对监控的视频高质量的显示,具有较好的应用前景。整个开发环境的搭建需要完成u-boot的烧写、内核的移植剪裁、根文件系统的制作等,并根据所选择的硬件进行硬件驱动的相关配置。视频采集模块中所用USB摄像头是OV7740模组摄像头,其中内嵌的DSP芯片iP2970会实现数据的MJPEG编码。移植MJPG-streamer构建服务器端,使用其支持的V4L2API(Application Programming Interface)接口对数据进行采集。配置网络环境,使WIFI网卡工作在AP模式下,并使其支持WPA2的认证/加密方式,为连入网卡的设备分配IP地址,进而达到传输的目的。针对想要实现的效果对客服端应用模块进行程序设计,使用多线程设计方法对服务器端传输的视频进行接收,完成数据的格式转换,最终刷到framebuffer缓冲区中来达到显示的目的。
[Abstract]:With the development of IT technology, video surveillance system is becoming more and more important in daily life. It not only helps to maintain public security and public property, but also acts as a deterrent to illegal and criminal activities. The society of the rule of law plays an indispensable role. In the process of practical application, the video surveillance system based on embedded technology has its advantages of comprehensive function, low power consumption, small size and good flexibility, so it occupies a place in video surveillance and is widely used in daily life. In this paper, a remote video surveillance system based on embedded technology is designed. The system uses S3C2440 platform with ARM920t kernel as hardware base, provides software support with Linux operating system, and carries out data transmission with network transmission technology. First, the functional modules of the system are divided, and the experimental development environment platform is established, and then the design scheme of the whole system is put forward according to the functions to be realized. The design is composed of the server and the client. The server uses V4L2 (video 4 linux2) technology to capture the video captured by the USB (Universal Serial Bus) camera and compress the data into MJPEG (Motion Joint Photographic Experts Group) format. The compressed data is transmitted to the customer service side through the network, and the received video format is converted and displayed to achieve the purpose of remote monitoring. This design method constructs a remote monitoring system based on C / S (Client/Server) architecture, which can display high quality video through polling mechanism, and has a good application prospect. The construction of the whole development environment needs to complete the u-boot burning, kernel transplanting, root file system production and so on, and according to the selected hardware to implement the hardware driver related configuration. The USB camera used in the video capture module is the OV7740 module camera, in which the embedded DSP chip iP2970 will realize the MJPEG encoding of the data. Transplant MJPG-streamer to build the server, and use its supported V4L2API (Application Programming Interface) interface to collect data. By configuring the network environment, the WIFI network card can work in AP mode, and it can support the authentication / encryption mode of WPA2, assign IP address to the equipment connected to the network card, and then achieve the purpose of transmission. According to the desired effect, the application module of customer service side is programmed. The multithread design method is used to receive the video transmitted on the server side, to complete the format conversion of the data, and finally to brush it into the framebuffer buffer to achieve the purpose of display.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN948.6

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