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基于无线局域网的移动视频监控系统.pdf

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http://www.paper.edu.cn TheMobileVideoSurveillanceSystemBased OnWirelessLAN ChunhuaWangZhengMaoYuZhangHailongLuo CollegeofElectronicInformation&ControlEngineering BeijingUniversityofTechnology Beijing,PRC100022 springwang@emails.bjut.edu.cn Abstract Thispaperproposesadesignschemeofmobilevideosurveillancesystembasedon wirelessLAN(WLAN),theoverallsystemarchitectureandkeytechnologies introduced.Theoperatingprinciple,processandrealizationofseveralmodulesare describedindetail,suchasvideocapturing,videoreproducing,videowireless transmitting,videoplayingonthemobileterminalsPDA,etc.IPmulticastand MPEG-4codectechniquesareusedtoo,sothesystemcanrealizereal-timevideo transmissioninthewayoffromonepointtomany. Keywords:WirelessLAN;Videosurveillance;Videodatatransmission;IPmulticast 1Introduction Withthecontinuouslydevelopmentoftheintelligentcommunity,thecommunity’ssupervisionandservices basedonelectron,informationandnetworktechnologieswillbegraduallyimprovedandthesafetyand protectionsystemofthecommunityisanindispensablepart.Buttheconventionalsecuresurveillance systemsareallintheformofcabletelevision,sothesecuritypersonnelmustobservetheenvironment constantlyinthecentermonitoringstation.Thatbringstomuchinconvenience.Wireless communicationtechnologiesprovidetheflexibilityandmobilityrequirementsessentialforfuture surveillance.TheadvanceofwirelessnetworktechnologywillmakewirelessLAN(WLAN)applied widelyinthefieldofsafety.Thepaperproposesadesignschemeofmobilevideosurveillancesystem basedonWLAN,surveillancepersonnelviamobileterminalPocketPCorPDA-likedevicescouldobserve oneormoresiteseverywhereintheWLANcoverage,atthesametimehecouldcontrolthecamera http://www.paper.edu.cn device’smoveandfocustochoseandorientkeyobservingobjectandrange.Inthiswaysecurity personnelcouldrushtotheaccidentsiteintime,thusthesurveillancestrengthandworkefficiencybothare improved. 2OverallSystemArchitecture Thesystemcouldtransmittheoriginalimagetothemaincontrolserverwhichisinthecentralmonitoring station