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基于ARM的嵌入式图像监控系统研究.docx

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IIStudyofanEmbeddedImageMonitoringSystemBasedonARMDiscipline:ControltheoryandcontrolengineeringStudentsignature:Supervisorsignature:ABSTRACTWiththerapidevolutionofdigitalimageembeddedcomputerandcommunicationtechniqueembeddedimagemonitoringsystembecomesanewresearchinginterest.Howeveralargenumberofpointlesspicturesaretransmittedbacktothemonitoringcenterwhichincreasescommunicationquantityandsurveillanceload;generallytheimage’sdefinitioninremotesurveillanceislowbecauseofitslimitedtransmissionchannel.Animprovingwayismovingobjectdetectioninthefrontofsystemandsnatchingahighdefinitionpicturewhenmotionhappensandthentransferringbacktothemonitoringcenter.Thismethodcansettlethecontradictionbetweendefinitionandtransferringspeed.InthedissertationakindofembeddedimagemonitoringsystembasedonARMisdiscussed.ThesystemhasthefunctionsofmotiondetectionandpicturetransmissionbasedonGPRSandimprovestheflexibilityofsettingandthedefinitionofabnormalpicture.ThesystemtakesLPC2210basedonARM7coreasitscentralprocessorandembeddedOSµC/OS-IIasitssoftwareplatform.Movingobjectdetectionadoptsamethodofdynamicdifferencebackgroundimagewhoseprincipleistocalculatedifferencepictureamongthecurrentframesandbackgroundimagesandtakethemotionadjudgingthresholdwhichownsmaximuminformationentropytodeterminemovingarea;anddynamicallyupdatesbackgroundbyusingKalmanfilter.Thusthesystemrealizesthejudgmentofthemovingareaunderthecomplicatedchangingbackground.ThemonitoringsystemadoptsembeddedWebservertechnologytosendwarninginformationandon-the-spotpicturetotheremotemonitoringcenter.Thewiredorwirelessremotetransmissionchannel(EthernetorGPRS)canbeadoptedbetweenth