【摘要】：隨著半導(dǎo)體產(chǎn)業(yè)的日益蓬勃發(fā)展,為嵌入式系統(tǒng)設(shè)計進(jìn)一步集成化、小型化、低成本化以及其速度、可靠性、穩(wěn)定性方面都帶來了巨大的進(jìn)步,使得嵌入式系統(tǒng)涉及的產(chǎn)業(yè)也越來越廣泛,尤其是在多媒體技術(shù)和網(wǎng)絡(luò)技術(shù)的飛速發(fā)展的情況下,嵌入式系統(tǒng)在傳統(tǒng)PC占據(jù)主流的視頻監(jiān)控市場中也漸漸嶄露頭角。在安全防范技術(shù)領(lǐng)域中,視頻監(jiān)控系統(tǒng)的發(fā)展經(jīng)歷了模擬視頻信號監(jiān)控系統(tǒng),通用計算機(jī)(PC)加載視頻采集卡的數(shù)字式監(jiān)控系統(tǒng),以及目前得到飛速發(fā)展的嵌入式網(wǎng)絡(luò)化的視頻監(jiān)控系統(tǒng)等幾個過程,目前,監(jiān)控現(xiàn)場視頻信息的獲取正在向著視頻采集前端一體化、視頻信號傳輸數(shù)字化、監(jiān)控數(shù)據(jù)網(wǎng)絡(luò)化共享、系統(tǒng)規(guī)模高度集成化的方向發(fā)展。因此,設(shè)計以嵌入式系統(tǒng)設(shè)備作為視頻信號采集的前端,在前端時就將圖像傳感器獲取的模擬圖像信號轉(zhuǎn)化為數(shù)字信號,通過合適的壓縮算法對視頻數(shù)據(jù)進(jìn)行壓縮,然后進(jìn)行本地存儲或者通過網(wǎng)絡(luò)傳輸?shù)竭h(yuǎn)程的用戶端,由用戶直接對其進(jìn)行遠(yuǎn)程控制,或是對視頻信息進(jìn)行后處理等工作成為當(dāng)下視頻監(jiān)控系統(tǒng)發(fā)展的必然趨勢。本課題提出了一種基于ARM+Linux的嵌入式視頻監(jiān)控系統(tǒng)的設(shè)計方案。 首先,在系統(tǒng)的硬件設(shè)計方面,以三星公司的ARM9微處理器為核心,詳細(xì)論述了嵌入式視頻監(jiān)控系統(tǒng)終端的基本組成、工作原理以及其主要模塊的選型依據(jù),在現(xiàn)有的硬件資源上搭建監(jiān)控系統(tǒng)實(shí)驗平臺,并對系統(tǒng)的主要硬件如Flash、SDRAM存儲器、UART接口、SD卡、液晶顯示器、網(wǎng)卡、CCD攝像頭接口、USB接口、JTAG接口等進(jìn)行分析,進(jìn)而完成系統(tǒng)硬件部分的設(shè)計 其次,在軟件設(shè)計方面,采用Linux作為嵌入式操作系統(tǒng),對Linux系統(tǒng)在嵌入式設(shè)備上的移植,外圍設(shè)備驅(qū)動程序的編寫,視頻信息的采集、存儲與壓縮,以及網(wǎng)絡(luò)傳輸協(xié)議設(shè)計等方面進(jìn)行了深入的分析,并重點(diǎn)研究了在嵌入式監(jiān)控系統(tǒng)設(shè)備前端采集中融入了數(shù)字圖像處理的部分內(nèi)容,即在采集前端就可以對原始視頻信息進(jìn)行濾波降噪等圖像預(yù)處理的功能,使得本系統(tǒng)對監(jiān)控現(xiàn)場可能存在的復(fù)雜環(huán)境因素有了較強(qiáng)的抗干擾能力,經(jīng)過預(yù)處理之后的視頻信息,即可用于普通的人眼直接觀測取證,也可用于機(jī)器視覺分析等高端技術(shù)領(lǐng)域。 最后在各個模塊正常工作的前提下,進(jìn)行系統(tǒng)調(diào)試、測試,針對不同場合應(yīng)用不同的圖像處理算法進(jìn)行了實(shí)驗結(jié)果的對比分析,實(shí)驗證明,本系統(tǒng)提供給用戶的軟件算法功能強(qiáng)大,適合常見監(jiān)控環(huán)境下的高質(zhì)量視頻圖像信息取證,完全能夠滿足一般條件下室內(nèi)或者室外安全監(jiān)控領(lǐng)域的應(yīng)用。
[Abstract]:With the rapid development of semiconductor industry, further integration, miniaturization, low cost and its speed, reliability and stability have brought great progress for embedded system design. With the rapid development of multimedia technology and network technology, embedded system is gradually emerging in the mainstream of traditional PC video surveillance market. In the field of security technology, the development of video surveillance system has experienced the analog video signal monitoring system, the digital monitoring system with (PC) loading video acquisition card. As well as the rapid development of embedded network video surveillance system and several other processes, at present, the video information acquisition on the scene is towards the video acquisition front-end integration, video signal transmission digitization, Monitoring data network sharing, the development of highly integrated system scale. Therefore, the embedded system equipment is designed as the front end of video signal acquisition. In the front end, the analog image signal obtained by the image sensor is converted into digital signal, and the video data is compressed by the appropriate compression algorithm. Then the local storage or transmission to the remote user through the network directly by the user to the remote control or the post-processing of video information become the inevitable trend of the current video monitoring system development. This paper presents a design scheme of embedded video surveillance system based on ARM Linux. First of all, in the hardware design of the system, taking the ARM9 microprocessor of Samsung as the core, the basic composition, the working principle and the selection basis of the main modules of the embedded video surveillance system terminal are discussed in detail. The main hardware of the system, such as Flash,SDRAM memory UART interface SD card, liquid crystal display, network card, Flash,SDRAM camera interface and JTAG interface, is built up on the existing hardware resources, and the main hardware of the system is analyzed, such as the Flash,SDRAM memory and the UART interface SD card, the LCD, the network card CCD camera interface and the JTAG interface, etc. Secondly, in software design, Linux is used as embedded operating system to transplant Linux system on embedded device, write peripheral device driver, collect video information. The storage and compression, as well as the design of network transmission protocol, are deeply analyzed, and some contents of digital image processing are mainly studied in the front end of embedded monitoring system. That is, the image preprocessing function such as filtering and de-noising of the original video information can be carried out in the front end of the acquisition, which makes the system have a strong anti-interference ability to the complex environmental factors that may exist in the monitoring field, and the video information after preprocessing. It can be used not only in ordinary human eye observation and evidence collection, but also in high-end technology such as machine vision analysis. Finally, under the premise of normal operation of each module, the system is debugged and tested, and the experimental results are compared and analyzed by using different image processing algorithms in different situations. The software algorithm provided by this system is powerful and suitable for high quality video image information forensics under common monitoring environment. It can fully meet the general conditions of indoor or outdoor security monitoring applications.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TP368.1;TP277;TP391.41

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本文編號：2247579