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硕士论文-基于复杂可编程器件的数字化高压电源设计，正文共65页。
【摘要】 随着科学技术的发展,应用于安防领域的视频监控系统已经从模拟系统逐渐过渡为网络化的数字系统,一些如煤炭等特殊行业的监控系统对系统的性能也提出了特殊的要求,如防爆性能等。如何实现监控系统的网络化是本论文的主要研究方向。本论文提出了基于嵌入式技术的两种视频监控系统的解决方案：一种是云台解码器及视频编码器分别和上位机进行网络通信,另一种是将模拟的云台解码器及视频接至嵌入式的视频服务器,然后由视频服务器进行网络通信。后一种方法也相当于是对现有设备的网络化改造。在前一种方法中,云台解码器实现控制命令接收、解析及动作控制的功能,其控制命令由上位机或控制台经以太网传送至云台解码器。该部分硬件以AVR系列单片机的ATmega128为核心处理器,通过网络控制芯片RTL8019AS完成以太网数据的接收。软件方面通过uIP协议栈的移植,实现对网络数据的接收,在对数据解析得到控制命令后进行命令响应。视频编码器实现视频数据流的采集,经编码后通过以太网进行传输的功能。本部分硬件以TI公司的TMS320DM642为核心构建视频处理平台,采用RF5框架进行程序编写,利用TI提供的各种技术支持,实现了视频编码器的功能要求。在后一种方法中,利用视频服务器及传统云台解码器、摄像机实现了系统的构建,并编写了上位机软件,实现了通过上位机软件对监控系统的控制及实时视频显示。本部分主要工作是构建了一种嵌入式的半数字化系统,使监控系统的组建更具灵活性。本文对这两种方法的软硬件原理及设计方法进行了详尽说明,并对每一部分的功能进行了测试。目前,各部分的功能已经实现,长时间持续运行的状况良好。
【Abstract】 With the development of science and technology, video monitoring system which used in the field of security has been a gradual transition from the analog system for the digital system with network function. And monitoring systems used in some special industries such as coal made a special request on the performance of the system, such as explosion-proof properties. How to implement network monitoring system is the main research direction of this paper.This paper presents the two solutions for video monitoring systems and they are both based on embedded technology. The one is communications between pan/tilt decoder/video encoder to host computer are respective. The other is both the analog pan/tilt and video decoder are connected to the embedded video server and then the video server communicate to host computer. The latter method is also equivalent to the transformation of existing network equipment.In the former method, the pan/tilt decoder performs functions of receiving commands through the Ethernet, parsing them and controlling motor actions. The core of the hardware system is ATmega128 which is a member of AVR family, and it completes Ethernet data reception by network control chip RTL8019AS. The software uses uIP protocol stack to receive network data, then it parses the commands and responses. Video encoder performs functions that video data stream capture, encode and transmission over Ethernet. Its hardware is a video processing platform based on the TMS320DM642. Its software is programming by RF5 framework, using resource of technical support that TI offers. It has all the functions which are need.In the latter method, the system builds based on video server, and analog pan/tilt decoder, camera. The system is controlled by PC software, and the software also can implement real-time video display. The main work of this part is to build an embedded semi-digital system, the monitoring system set up more flexible.This paper gives a detailed description of the hardware and software principles and design methods for the two methods, and the functions of each part are tested. Currently, the function of each part has been achieved, long-hour operation in good condition.
【关键词】 视频监控； 云台解码器； uIP协议； 视频编码器；
【Key words】 Video monitoring； Pan/tilt decoder； uIP protocol； Video encoder；