內(nèi)容簡介：
碩士學(xué)位論文 基于復(fù)雜可編程器件的數(shù)字化高壓電源設(shè)計，正文共65頁。
【摘要】 隨著科學(xué)技術(shù)的發(fā)展,應(yīng)用于安防領(lǐng)域的視頻監(jiān)控系統(tǒng)已經(jīng)從模擬系統(tǒng)逐漸過渡為網(wǎng)絡(luò)化的數(shù)字系統(tǒng),一些如煤炭等特殊行業(yè)的監(jiān)控系統(tǒng)對系統(tǒng)的性能也提出了特殊的要求,如防爆性能等。如何實現(xiàn)監(jiān)控系統(tǒng)的網(wǎng)絡(luò)化是本論文的主要研究方向。本論文提出了基于嵌入式技術(shù)的兩種視頻監(jiān)控系統(tǒng)的解決方案：一種是云臺解碼器及視頻編碼器分別和上位機進行網(wǎng)絡(luò)通信,另一種是將模擬的云臺解碼器及視頻接至嵌入式的視頻服務(wù)器,然后由視頻服務(wù)器進行網(wǎng)絡(luò)通信。后一種方法也相當(dāng)于是對現(xiàn)有設(shè)備的網(wǎng)絡(luò)化改造。在前一種方法中,云臺解碼器實現(xiàn)控制命令接收、解析及動作控制的功能,其控制命令由上位機或控制臺經(jīng)以太網(wǎng)傳送至云臺解碼器。該部分硬件以AVR系列單片機的ATmega128為核心處理器,通過網(wǎng)絡(luò)控制芯片RTL8019AS完成以太網(wǎng)數(shù)據(jù)的接收。軟件方面通過uIP協(xié)議棧的移植,實現(xiàn)對網(wǎng)絡(luò)數(shù)據(jù)的接收,在對數(shù)據(jù)解析得到控制命令后進行命令響應(yīng)。視頻編碼器實現(xiàn)視頻數(shù)據(jù)流的采集,經(jīng)編碼后通過以太網(wǎng)進行傳輸?shù)墓δ堋１静糠钟布訲I公司的TMS320DM642為核心構(gòu)建視頻處理平臺,采用RF5框架進行程序編寫,利用TI提供的各種技術(shù)支持,實現(xiàn)了視頻編碼器的功能要求。在后一種方法中,利用視頻服務(wù)器及傳統(tǒng)云臺解碼器、攝像機實現(xiàn)了系統(tǒng)的構(gòu)建,并編寫了上位機軟件,實現(xiàn)了通過上位機軟件對監(jiān)控系統(tǒng)的控制及實時視頻顯示。本部分主要工作是構(gòu)建了一種嵌入式的半數(shù)字化系統(tǒng),使監(jiān)控系統(tǒng)的組建更具靈活性。本文對這兩種方法的軟硬件原理及設(shè)計方法進行了詳盡說明,并對每一部分的功能進行了測試。目前,各部分的功能已經(jīng)實現(xiàn),長時間持續(xù)運行的狀況良好。
【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.
【關(guān)鍵詞】 視頻監(jiān)控； 云臺解碼器； uIP協(xié)議； 視頻編碼器；
【Key words】 Video monitoring； Pan/tilt decoder； uIP protocol； Video encoder；
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