發(fā)布時間：2018-09-15 19:18

【摘要】：錄像存儲技術(shù)是網(wǎng)絡(luò)視頻監(jiān)控系統(tǒng)的一項關(guān)鍵技術(shù),是決定系統(tǒng)整體性能和規(guī)模大小的主要因素之一。傳統(tǒng)的錄像存儲解決方案由于采用文件方式將錄像數(shù)據(jù)集中存儲于第三方存儲設(shè)備,往往存在軟硬件成本高、錄像管理效率低下和錄像存儲性能不足等問題,成為系統(tǒng)發(fā)展的瓶頸。因此,發(fā)展視頻存儲技術(shù)、改進錄像存儲解決方案對推動視頻監(jiān)控行業(yè)的發(fā)展有著重要的意義。 本文設(shè)計研發(fā)了網(wǎng)絡(luò)視頻監(jiān)控系統(tǒng)存儲子系統(tǒng)軟件。該軟件運行于Linux平臺,基于iSCSI協(xié)議、RAID技術(shù)、LVM技術(shù)和以太網(wǎng)技術(shù),設(shè)計研發(fā)了一種專用于網(wǎng)絡(luò)視頻監(jiān)控系統(tǒng)的存儲區(qū)域網(wǎng)絡(luò)以實現(xiàn)錄像集中存儲,降低了系統(tǒng)成本；采用多線程及網(wǎng)絡(luò)編程技術(shù),設(shè)計了一種包含存儲資源劃歸、錄像檢索回放和錄像信息實時更新等功能的高效精確的錄像管理方案,提高了系統(tǒng)集成度；針對傳統(tǒng)文件系統(tǒng)存儲方案的存儲效率低和檢索性能差的缺陷,設(shè)計了一種基于裸磁盤設(shè)備的錄像存儲方案。方案根據(jù)監(jiān)控系統(tǒng)的數(shù)據(jù)存儲特點,設(shè)計了一種磁盤邏輯存儲結(jié)構(gòu),其中采用B+樹管理錄像段索引信息,并設(shè)計了一種基于圖像組(GOP)的數(shù)據(jù)緩存機制。相對于傳統(tǒng)的文件系統(tǒng)存儲方案,將監(jiān)控系統(tǒng)的512Kbps和IMbps典型存儲碼率下的錄像存儲效率分別提高了43.6%和30.3%,錄像檢索耗時降至25～35ms之間。
[Abstract]:Video storage technology is a key technology of network video surveillance system, and it is one of the main factors to determine the overall performance and size of the system. Because the traditional video storage solution uses the file way to store the video data in the third party storage device, it often has the problems such as high cost of software and hardware, low efficiency of video recording management and insufficient performance of video storage, etc. Become the bottleneck of system development. Therefore, it is of great significance to develop video storage technology and improve video storage solutions to promote the development of video surveillance industry. This paper designs and develops the storage subsystem software of network video surveillance system. The software runs on Linux platform. Based on iSCSI protocol raid technology and Ethernet technology, a kind of storage area network is designed and developed for the network video surveillance system to realize the centralized storage of video recording, which reduces the cost of the system. By using multithreading and network programming technology, an efficient and accurate video management scheme is designed, which includes the functions of storage resource categorization, video retrieval and playback, and real-time updating of video information, which improves the system integration. A video storage scheme based on bare disk device is designed to overcome the shortcomings of low storage efficiency and poor retrieval performance of traditional file system storage schemes. According to the data storage characteristics of the monitoring system, a disk logical storage structure is designed, in which B-tree is used to manage the video segment index information, and a data cache mechanism based on image group (GOP) is designed. Compared with the traditional file system storage scheme, the video storage efficiency under the typical storage rate of 512Kbps and IMbps is increased by 43.6% and 30.3%, respectively, and the video retrieval time is reduced to 25~35ms.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TN948.6;TP333

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