带监控功能的车载多媒体终端的设计与实现

发布时间：2018-05-14 15:42

本文选题：MPEG-4 + 监控　；参考：《电子科技大学》2011年硕士论文

【摘要】：当今社会,汽车保有量逐年上升,车辆的管理、调配和安全是比较突出的问题。为了方便对出租车、公共汽车等公共交通工具进行有效的管理,并对这些车辆司机的安全提供一定的保证,需要对车辆内部进行图像监控。同时随着汽车数量的上升,车载广告市场潜力巨大。传统GPS系统和车载数字电视功能单一,不能满足市场的需求。针对这个问题,本文设计与实现了一种带监控功能的车载多媒体终端,具有无线通信功能,不仅可以通过无线信道从管理中心下载节目并播放,而且可以采集车辆内部的图像,进行存储并通过无线信道上传到管理中心进行显示,实现对车内情况的监控。本文的研究内容主要包括: 首先,基于图像传输的需求以及车载应用的特点,通过对视频压缩算法和无线传输技术的调研,确定采用MPEG-4作为视频压缩算法,采用GPRS作为无线传输方式。根据系统需求规划了终端功能,搭建硬件平台,采用适合多媒体通信应用的ADSP-BF532数字信号处理器作为终端的主芯片,辅以SDRAM及FLASH存储器,外围采用视频编解码芯片用于视频输入输出,音频D/A芯片和功放用于音频输出,通过串口连接GPRS模块进行GPRS无线通信。定义了TCP协议之上的通信前置机协议与管理中心协议。软件设计采用集成的软件开发环境VisualDSP++开发,实现各个功能模块。最后,通过室内测试、环境试验和实际应用环境测试这三个阶段的测试,验证了设备的各项功能和通信协议,在振动和高温条件下的适应性以及在实际应用环境中通信协议及监控等各项功能的稳定性和可靠性,满足了车载环境下车辆内部图像监控和广告播放的需求。
[Abstract]:Nowadays, the number of cars is increasing year by year. The management, deployment and safety of vehicles are outstanding problems. In order to facilitate the effective management of taxi, bus and other public transport vehicles, and to provide a certain guarantee for the safety of the drivers of these vehicles, it is necessary to monitor the internal images of the vehicles. At the same time, with the increase in the number of cars, vehicle advertising market potential is huge. Traditional GPS system and vehicle-mounted digital TV have a single function, which can not meet the needs of the market. In order to solve this problem, this paper designs and implements a vehicle multimedia terminal with monitoring function, which has wireless communication function. It can not only download and play programs from the management center through wireless channel, but also collect the images of the vehicle interior. Storage and upload to the management center through the wireless channel display, to achieve the monitoring of the situation in the car. The main contents of this paper are as follows: Firstly, based on the requirements of image transmission and the characteristics of vehicle applications, through the investigation of video compression algorithm and wireless transmission technology, MPEG-4 is adopted as video compression algorithm and GPRS as wireless transmission mode. According to the requirement of the system, the terminal function is planned, the hardware platform is built, the ADSP-BF532 digital signal processor suitable for multimedia communication is adopted as the main chip of the terminal, and the SDRAM and FLASH memory are used as the main chip. The peripheral uses the video codec chip for the video input and output, the audio D / A chip and the power amplifier for the audio output, and connects the GPRS module through the serial port to carry on the GPRS wireless communication. The communication preprocessor protocol and the management center protocol based on TCP protocol are defined. The software design adopts the integrated software development environment VisualDSP development, realizes each function module. Finally, the functions and communication protocols of the equipment are verified by the three stages of indoor test, environmental test and practical application environment test. The adaptability under the condition of vibration and high temperature and the stability and reliability of the communication protocol and monitoring function in the practical application environment can meet the needs of the vehicle internal image monitoring and advertisement playing in the vehicle environment.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TP37

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