车载嵌入式高清视频处理终端的设计与实现
发布时间：2018-10-23 11:19
【摘要】：随着近些年城市轨道交通的快速发展及人们对轨道交通的依赖性的提高,如何确保旅客安全及为乘客提供更优质的服务,已成为地铁工作的主要内容。地铁车载多媒体信息系统作为最直接和乘客交互的安全服务系统,直接承担着地铁安全稳定运行的重要责任。车载视频处理系统作为车载多媒体信息系统最重要的系统之一,直接起到为旅客提供优质服务及在紧急情况下的处理事故和认定责任的作用。 通过对北京地铁各条线路的调研发现,目前车载视频处理终端普遍存在着易死机和图像清晰度较低的问题,究其原因,在于操作系统不稳定及视频图像分辨率较低,故针对此,本文提出一种全数字的基于嵌入式Linux操作系统的车载高清视频处理终端,实现车载高清视频监控功能。 通过对目前主流嵌入式视频处理系统的分析,本文采用TI公司Davinci系列多核处理器TMS320DM368作为核心处理器,Linux2.6.18作为处理操作系统,以CMOS图像传感器作为高清视频采集器件,采用H.264作为系统编解码格式,系统分辨率支持1080P和720P,同时在设计时预留了高清视频显示HDMI和色差分量视频显示接口,为日后高清视频显示系统的集成和扩展提供了可能。本文将重点对所设计的系统的硬件和内核启动引导程序进行详细分析设计。对于系统硬件,本文将重点对系统原理图及PCB绘制过程进行设计论述,系统硬件设计包括小系统设计、高清视频采集接口电路设计、高清视频显示接口电路设计、以太网通信接口电路及SD卡存储电路设计等。对于系统PCB,本文将给出8层核心主板和4层接口底板的具体绘制过程,并对绘制过程中关键布线点进行详细说明。对于系统软件,本文将重点对系统内核引导程序UBL、 U-boot源码及修改移植过程进行详细分析论述,同时对系统开发环境的建立、启动原理的分析、内核裁剪移植的过程进行研究介绍,并最终通过实验验证了设计的正确性,实现了1080P和720P的高清视频监控功能。
[Abstract]:With the rapid development of urban rail transit in recent years and the improvement of people's dependence on rail transit, how to ensure passenger safety and provide better service for passengers has become the main content of subway work. As the most direct and interactive security service system, the subway vehicle multimedia information system is directly responsible for the safe and stable operation of the subway. As one of the most important systems of vehicular multimedia information system, vehicular video processing system directly plays the role of providing high-quality services for passengers, handling accidents and determining responsibility in emergency situations. Through the investigation of each line of Beijing subway, it is found that the problems of easy to crash and low definition of image are common in the on-board video processing terminal at present. The reason is that the operating system is unstable and the resolution of video image is low, so in view of this, This paper presents a full digital high definition video processing terminal based on embedded Linux operating system. Based on the analysis of the mainstream embedded video processing system, this paper uses TI Davinci series of multi-core processor TMS320DM368 as the core processor, Linux2.6.18 as the processing operating system, and CMOS image sensor as the high-definition video capture device. H.264 is used as the coding and decoding format of the system. The system resolution supports 1080P and 720P. at the same time, the HDMI and the color difference component video display interface are reserved for the design, which provides the possibility for the integration and expansion of the HD video display system in the future. This paper will focus on the design of the system hardware and kernel boot program for detailed analysis and design. For the hardware of the system, this paper will focus on the design of the system schematic diagram and PCB drawing process. The hardware design of the system includes small system design, high-definition video acquisition interface circuit design, high-definition video display interface circuit design. Ethernet communication interface circuit and SD card storage circuit design. For the system PCB, this paper will give the concrete drawing process of 8-layer core motherboard and 4-layer interface bottom board, and explain the key wiring points in the process of drawing in detail. For the system software, this paper will focus on the system kernel boot program UBL, U-boot source code and modify the process of transplantation, and at the same time the establishment of the system development environment, startup principle analysis, The process of kernel tailoring and transplanting is introduced, and finally the correctness of the design is verified by experiments, and the high-definition video surveillance functions of 1080P and 720P are realized.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP368.1;TP277
本文编号：2289070
[Abstract]:With the rapid development of urban rail transit in recent years and the improvement of people's dependence on rail transit, how to ensure passenger safety and provide better service for passengers has become the main content of subway work. As the most direct and interactive security service system, the subway vehicle multimedia information system is directly responsible for the safe and stable operation of the subway. As one of the most important systems of vehicular multimedia information system, vehicular video processing system directly plays the role of providing high-quality services for passengers, handling accidents and determining responsibility in emergency situations. Through the investigation of each line of Beijing subway, it is found that the problems of easy to crash and low definition of image are common in the on-board video processing terminal at present. The reason is that the operating system is unstable and the resolution of video image is low, so in view of this, This paper presents a full digital high definition video processing terminal based on embedded Linux operating system. Based on the analysis of the mainstream embedded video processing system, this paper uses TI Davinci series of multi-core processor TMS320DM368 as the core processor, Linux2.6.18 as the processing operating system, and CMOS image sensor as the high-definition video capture device. H.264 is used as the coding and decoding format of the system. The system resolution supports 1080P and 720P. at the same time, the HDMI and the color difference component video display interface are reserved for the design, which provides the possibility for the integration and expansion of the HD video display system in the future. This paper will focus on the design of the system hardware and kernel boot program for detailed analysis and design. For the hardware of the system, this paper will focus on the design of the system schematic diagram and PCB drawing process. The hardware design of the system includes small system design, high-definition video acquisition interface circuit design, high-definition video display interface circuit design. Ethernet communication interface circuit and SD card storage circuit design. For the system PCB, this paper will give the concrete drawing process of 8-layer core motherboard and 4-layer interface bottom board, and explain the key wiring points in the process of drawing in detail. For the system software, this paper will focus on the system kernel boot program UBL, U-boot source code and modify the process of transplantation, and at the same time the establishment of the system development environment, startup principle analysis, The process of kernel tailoring and transplanting is introduced, and finally the correctness of the design is verified by experiments, and the high-definition video surveillance functions of 1080P and 720P are realized.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP368.1;TP277
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