發(fā)布時(shí)間：2018-04-02 12:15

  本文選題：云臺(tái)控制　切入點(diǎn)：STM32　出處：《西安工程大學(xué)》2016年碩士論文

【摘要】：隨著視頻監(jiān)控技術(shù)的發(fā)展,具有代表性的高速球型網(wǎng)絡(luò)攝像機(jī)的研究,是市場關(guān)注的焦點(diǎn)。該類型的高速球機(jī)通過云臺(tái)轉(zhuǎn)動(dòng)改變攝像機(jī)的角度位置,達(dá)到擴(kuò)大監(jiān)視范圍的用途,云臺(tái)在監(jiān)控系統(tǒng)中起著重要的作用。但是由于不同品牌設(shè)備的接口不統(tǒng)一,造成網(wǎng)絡(luò)視頻監(jiān)控市場一直缺乏開放性,需要解決云臺(tái)控制系統(tǒng)與網(wǎng)絡(luò)攝像機(jī)的接口通信問題。因此,本文在開放型網(wǎng)絡(luò)視頻接口標(biāo)準(zhǔn)ONVIF的研究基礎(chǔ)之上,完成了云臺(tái)控制網(wǎng)絡(luò)監(jiān)控系統(tǒng)的設(shè)計(jì),能與支持ONVIF協(xié)議的網(wǎng)絡(luò)攝像機(jī)通信,實(shí)現(xiàn)了網(wǎng)絡(luò)監(jiān)控的“標(biāo)準(zhǔn)統(tǒng)一、互聯(lián)互通”。本文首先研究分析云臺(tái)的工作原理和ONVIF標(biāo)準(zhǔn)接口PTZ控制的整體架構(gòu),然后對基于ONVIF協(xié)議的云臺(tái)控制網(wǎng)絡(luò)監(jiān)控系統(tǒng)的功能實(shí)現(xiàn)進(jìn)行研究設(shè)計(jì)。硬件方面,互聯(lián)型微控制器STM32F107作為核心,主要完成步進(jìn)電機(jī)驅(qū)動(dòng)模塊的設(shè)計(jì),采用PWM實(shí)現(xiàn)DAC轉(zhuǎn)換控制電壓細(xì)分,保證電機(jī)平穩(wěn)轉(zhuǎn)動(dòng)。重點(diǎn)設(shè)計(jì)以太網(wǎng)控制模塊,采用STM32外接網(wǎng)絡(luò)物理層PHY芯片的方法實(shí)現(xiàn)網(wǎng)絡(luò)接口功能,通過交換機(jī)和隔離變壓器完成系統(tǒng)內(nèi)部網(wǎng)絡(luò)連接,保證云臺(tái)能夠監(jiān)聽ONVIF協(xié)議PTZ控制數(shù)據(jù)包。軟件方面,Free RTOS作為軟件運(yùn)行的平臺(tái),將應(yīng)用程序劃分為多個(gè)重要性不同的任務(wù),提高了系統(tǒng)的實(shí)時(shí)性;網(wǎng)絡(luò)協(xié)議棧Lw IP提供網(wǎng)絡(luò)服務(wù)功能,實(shí)現(xiàn)了ONVIF網(wǎng)絡(luò)命令的傳送解析。主要完成電機(jī)控制模塊程序開發(fā),采用定時(shí)器觸發(fā)的方式實(shí)現(xiàn)PWM波形,查表法改變PWM的占空比,實(shí)現(xiàn)了步進(jìn)電機(jī)的細(xì)分轉(zhuǎn)動(dòng)。重點(diǎn)完成ONVIF協(xié)議PTZ命令解析,采用字符串搜索的方法,獲得相應(yīng)的控制命令和參數(shù),實(shí)現(xiàn)了云臺(tái)監(jiān)聽客戶端發(fā)送給ONVIF網(wǎng)絡(luò)攝像機(jī)的PTZ數(shù)據(jù)包,STM32處理命令并驅(qū)動(dòng)步進(jìn)電機(jī)轉(zhuǎn)動(dòng)的功能。最后將云臺(tái)控制系統(tǒng)與ONVIF網(wǎng)絡(luò)攝像機(jī)進(jìn)行聯(lián)機(jī)測試,調(diào)試結(jié)果表明,本文設(shè)計(jì)的云臺(tái)控制系統(tǒng)能通過網(wǎng)絡(luò)進(jìn)行遠(yuǎn)程訪問,達(dá)到了云臺(tái)控制的接口通信要求,調(diào)整云臺(tái)的旋轉(zhuǎn)從而改變攝像機(jī)的角度位置,實(shí)現(xiàn)了實(shí)時(shí)性全方位精確定位。
[Abstract]:With the development of video surveillance technology, the research of the representative high-speed spherical network camera is the focus of market attention. This type of high-speed ball machine changes the angle position of the camera through the rotation of the cloud head, and achieves the purpose of expanding the scope of surveillance. Cloud head plays an important role in the monitoring system. However, because the interface of different brand equipment is not uniform, the network video surveillance market has been lack of openness. It is necessary to solve the problem of interface communication between the control system of cloud head and the network camera. Therefore, based on the research of the open network video interface standard ONVIF, the design of the control network monitoring system of cloud head is completed in this paper. It can communicate with the network camera which supports ONVIF protocol, and realize the "standard unification, interconnection" of network monitoring. Firstly, this paper studies and analyzes the working principle of cloud head and the whole structure of PTZ control of ONVIF standard interface. Then the function realization of the cloud head control network monitoring system based on ONVIF protocol is studied and designed. In the hardware aspect, the interconnect microcontroller STM32F107 is the core, which mainly completes the design of the stepper motor driving module. PWM is used to realize the subdivision of DAC conversion control voltage to ensure the smooth rotation of the motor. The Ethernet control module is designed emphatically, and the network interface function is realized by using the STM32 external network physical layer PHY chip. Through the switch and isolation transformer to complete the system internal network connection, ensure that the cloud head can monitor the ONVIF protocol PTZ control data packet. As the software running platform, the application program is divided into many tasks of different importance. The network protocol stack Lw IP provides network service function, realizes the transmission and analysis of ONVIF network command, mainly completes the development of motor control module program, and realizes the PWM waveform by timer trigger. The look-up table method changes the duty cycle of PWM and realizes the subdivision rotation of step motor. The analysis of PTZ command of ONVIF protocol is carried out emphatically, and the corresponding control commands and parameters are obtained by using the method of string search. The function of PTZ packet STM32, which is sent to ONVIF network camera by monitoring client, is realized. Finally, the control system of cloud head is tested online with ONVIF network camera, and the debugging results show that, The control system of the cloud head designed in this paper can be accessed remotely through the network, which meets the communication requirements of the interface of the cloud head control, adjusts the rotation of the cloud head to change the angle position of the camera, and realizes the real-time and accurate positioning.
【學(xué)位授予單位】：西安工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP393.06

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