基于arm的嵌入式图像监控系统研究硕士学位

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1、IIStudyofanEmbeddedImageMonitoringSystemBasedonARMDiscipline:ControltheoryandcontrolengineeringStudentsignature:Supervisorsignature:ABSTRACTWiththerapidevolutionofdigitalimage,embeddedcomputerandcommunicationtechnique,embeddedimagemonitoringsystembecomesanewres

2、earchinginterest.However,alargenumberofpointlesspicturesaretransmittedbacktothemonitoringcenter,whichincreasescommunicationquantityandsurveillanceload;generally,theimage’sdefinitioninremotesurveillanceislowbecauseofitslimitedtransmissionchannel.Animprovingwayis

3、movingobjectdetectioninthefrontofsystem,andsnatchingahighdefinitionpicturewhenmotionhappensandthentransferringbacktothemonitoringcenter.Thismethodcansettlethecontradictionbetweendefinitionandtransferringspeed.Inthedissertation,akindofembeddedimagemonitoringsyst

4、embasedonARMisdiscussed.ThesystemhasthefunctionsofmotiondetectionandpicturetransmissionbasedonGPRS,andimprovestheflexibilityofsettingandthedefinitionofabnormalpicture.ThesystemtakesLPC2210basedonARM7coreasitscentralprocessor,andembeddedOSµC/OS-IIasitssoftwarepl

5、atform.Movingobjectdetectionadoptsamethodofdynamicdifferencebackgroundimage,whoseprincipleistocalculatedifferencepictureamongthecurrentframesandbackgroundimagesandtakethemotionadjudgingthresholdwhichownsmaximuminformationentropytodeterminemovingarea;anddynamica

6、llyupdatesbackgroundbyusingKalmanfilter.Thus,thesystemrealizesthejudgmentofthemovingareaunderthecomplicatedchangingbackground.ThemonitoringsystemadoptsembeddedWebservertechnologytosendwarninginformationandon-the-spotpicturetotheremotemonitoringcenter.Thewiredor

7、wirelessremotetransmissionchannel(EthernetorGPRS)canbeadoptedbetweenthecenterandthefrontcontrolpoint,andhasthefeaturesofmutualsupplement,convenienceandflexibility.AndGPRScommunicationterminaladoptsWavecomwirelessmoduletotransmitmonitoringimagethroughwirelesscom

8、monnetwork.Inthedissertation,theprincipleandimplementationofembeddedimagemonitoringsystembasedonARMarediscussed.Experimentalresultsshowthattheimplementedsystemperformswellin