基于arm的嵌入式图像监控系统研究硕士学位论文

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1、IIStudyofanEmbeddedImageMonitoringSystemBasedonARMDiscipline:ControltheoryandcontrolengineeringStudentsignature:Supervisorsignature:ABSTRACTWiththerapidevolutionofdigitalimage,embeddedcomputerandcommunicationtechnique,embeddedimagemonitoringsystembecomesanewresearchinginterest.Howe

2、ver,alargenumberofpointlesspicturesaretransmittedbacktothemonitoringcenter,whichincreasescommunicationquantityandsurveillanceload;generally,theimage’sdefinitioninremotesurveillanceislowbecauseofitslimitedtransmissionchannel.Animprovingwayismovingobjectdetectioninthefrontofsystem,an

3、dsnatchingahighdefinitionpicturewhenmotionhappensandthentransferringbacktothemonitoringcenter.Thismethodcansettlethecontradictionbetweendefinitionandtransferringspeed.Inthedissertation,akindofembeddedimagemonitoringsystembasedonARMisdiscussed.Thesystemhasthefunctionsofmotiondetecti

4、onandpicturetransmissionbasedonGPRS,andimprovestheflexibilityofsettingandthedefinitionofabnormalpicture.ThesystemtakesLPC2210basedonARM7coreasitscentralprocessor,andembeddedOSµC/OS-IIasitssoftwareplatform.Movingobjectdetectionadoptsamethodofdynamicdifferencebackgroundimage,whosepri

5、ncipleistocalculatedifferencepictureamongthecurrentframesandbackgroundimagesandtakethemotionadjudgingthresholdwhichownsmaximuminformationentropytodeterminemovingarea;anddynamicallyupdatesbackgroundbyusingKalmanfilter.Thus,thesystemrealizesthejudgmentofthemovingareaunderthecomplicat

6、edchangingbackground.ThemonitoringsystemadoptsembeddedWebservertechnologytosendwarninginformationandon-the-spotpicturetotheremotemonitoringcenter.Thewiredorwirelessremotetransmissionchannel(EthernetorGPRS)canbeadoptedbetweenthecenterandthefrontcontrolpoint,andhasthefeaturesofmutual

7、supplement,convenienceandflexibility.AndGPRScommunicationterminaladoptsWavecomwirelessmoduletotransmitmonitoringimagethroughwirelesscommonnetwork.Inthedissertation,theprincipleandimplementationofembeddedimagemonitoringsystembasedonARMarediscussed.Experimentalresultsshowthattheimple

8、mentedsystemperformswellin