發(fā)布時(shí)間：2018-01-22 20:55

  本文關(guān)鍵詞： 視頻監(jiān)控 窄帶寬 視頻服務(wù)器 H.264　出處：《電子科技大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著經(jīng)濟(jì)的發(fā)展和人們生活水平的提高,安防觀念已經(jīng)漸漸融入各行各業(yè)和人們的日常生活。在科學(xué)技術(shù)進(jìn)步的推動(dòng)下,安防系統(tǒng)也發(fā)生著翻天覆地的變化,從最初的以電纜為基礎(chǔ)的模擬視頻監(jiān)控系統(tǒng)到以DVR(數(shù)字視頻錄像機(jī))為基礎(chǔ)的數(shù)字視頻監(jiān)控系統(tǒng),再到今天普遍使用的以網(wǎng)絡(luò)型DVR為基礎(chǔ)的IP視頻監(jiān)控系統(tǒng)。視頻監(jiān)控系統(tǒng)正朝著數(shù)字化、網(wǎng)絡(luò)化發(fā)展,對(duì)穩(wěn)定性以及圖像清晰度也有了較高要求�？v觀監(jiān)控領(lǐng)域在寬帶網(wǎng)絡(luò)和專網(wǎng)下都有著豐富的產(chǎn)品,然而針對(duì)窄帶寬的產(chǎn)品卻寥寥無(wú)幾,鑒于此,本課題設(shè)計(jì)開(kāi)發(fā)一套能夠適應(yīng)窄帶寬網(wǎng)絡(luò)環(huán)境的視頻監(jiān)控系統(tǒng)。本課題研究的視頻服務(wù)器基于升邁科技的GM8180 SoC,具備強(qiáng)勁的CPU和專用的H.264編碼引擎,運(yùn)行高度裁剪的嵌入式linux,與平臺(tái)服務(wù)器間信令交互采用TCP鏈接輔以心跳機(jī)制確保信令交互可靠。采用H.264視頻壓縮算法輔以抽幀技術(shù),減少不必要的數(shù)據(jù)傳輸。采用ADPCM音頻壓縮算法在不消耗過(guò)多CPU資源的情況下獲得較好的音質(zhì)和較小的音頻數(shù)據(jù)量。采用專門(mén)設(shè)計(jì)的傳輸策略,增加帶寬的利用率,從而增強(qiáng)傳輸能力。本課題系統(tǒng)架構(gòu)采用分布式體系架構(gòu),可有效平衡監(jiān)控中心之間的負(fù)載,并且單個(gè)監(jiān)控中心出現(xiàn)故障不會(huì)影響到整個(gè)系統(tǒng)。同時(shí)系統(tǒng)架構(gòu)設(shè)計(jì)時(shí)參考了TCP/IP五層模型的設(shè)計(jì)思路,從整體上看,系統(tǒng)分為3個(gè)層次:終端接入層、通信層、應(yīng)用層。應(yīng)用層的業(yè)務(wù)采用模塊化設(shè)計(jì)的原則,除開(kāi)核心的通信、媒體轉(zhuǎn)發(fā)、配置,其他業(yè)務(wù)模塊可以根據(jù)需求自由拆分、組合,靈活性十足。本文介紹了本課題的背景及意義,視頻監(jiān)控系統(tǒng)的發(fā)展歷程以及視頻服務(wù)器的優(yōu)勢(shì)。探討了監(jiān)控系統(tǒng)系統(tǒng)開(kāi)發(fā)中的一些關(guān)鍵技術(shù),包括視頻接口技術(shù)、壓縮算法、音頻壓縮算法、傳輸協(xié)議。對(duì)視頻服務(wù)器和平臺(tái)軟件的功能和技術(shù)指標(biāo)做了一些要求,并對(duì)系統(tǒng)的總體設(shè)計(jì)分別從系統(tǒng)應(yīng)用場(chǎng)景、核心視頻服務(wù)器、系統(tǒng)平臺(tái)三方面做了說(shuō)明。文中著重介紹了視頻服務(wù)器的實(shí)現(xiàn)原理,采用的關(guān)鍵芯片、硬件構(gòu)成、軟件構(gòu)成與實(shí)現(xiàn),簡(jiǎn)要介紹如何實(shí)現(xiàn)系統(tǒng)平臺(tái),然后介紹了本平臺(tái)軟件的優(yōu)點(diǎn)。最后檢驗(yàn)系統(tǒng)設(shè)計(jì)的成果,對(duì)測(cè)試結(jié)果進(jìn)行分析、總結(jié)和展望。
[Abstract]:With the development of economy and the improvement of people's living standard, the concept of security and defense has gradually integrated into various industries and people's daily life. Under the impetus of the progress of science and technology, the security and defense system is also undergoing earth-shaking changes. From the cable based analog video surveillance system to the DVR (digital video recorder) based digital video surveillance system. Then the IP video surveillance system based on the network DVR is widely used today. The video surveillance system is developing towards the digitization and networking. There are also higher requirements for stability and image clarity. Throughout the field of monitoring in broadband networks and private networks have a wealth of products, but there are very few products for narrow bandwidth, in view of this. This paper designs and develops a set of video surveillance system which can adapt to the narrow bandwidth network environment. The video server studied in this paper is based on GM8180 SoC of Shengmai Technology. Strong CPU and dedicated H.264 encoding engine running highly tailored embedded linux. The signaling interaction with the platform server is guaranteed by TCP link and heartbeat mechanism, and the H.264 video compression algorithm is used to support the frame extraction technology. Reduce unnecessary data transmission. Adopt ADPCM audio compression algorithm to get better sound quality and smaller audio data without consuming too much CPU resources. Adopt specially designed transmission strategy. Increase the utilization of bandwidth, thus enhance the transmission capacity. This system architecture uses distributed architecture, can effectively balance the load between the monitoring center. And the failure of a single monitoring center will not affect the entire system. At the same time, the system architecture design referred to the TCP/IP five-tier model design ideas, from the overall point of view. The system is divided into three levels: terminal access layer, communication layer, application layer. The application layer uses the principle of modularization design, apart from core communication, media forwarding, configuration. Other business modules can be split freely, combined and flexible according to requirements. This paper introduces the background and significance of this topic. This paper discusses some key technologies in the development of video surveillance system, including video interface technology, compression algorithm and audio compression algorithm. Transmission protocol. To the video server and platform software functions and technical specifications to do some requirements, and the overall design of the system from the system application scenarios, core video server. This paper mainly introduces the realization principle of video server, the key chip, the hardware structure, the software structure and the realization, and briefly introduces how to realize the system platform. Then the advantages of the platform software are introduced. Finally, the design results of the system are verified, and the test results are analyzed, summarized and prospected.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN948.6

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