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1、AbstractAbstractAnalogMeasuringInstrumentsarewidelyusedinmetrology,minesindustryandpowerplantstomonitorvariousparameterindexesduetotheirsimplestructure,convenientmaintenance,anti-electromagneticinterferenceability,aswellasdurableness,especiallywidelyusedtomonitoroperatin
2、gstatusofequipmentandpressureofgasinpowerswitchwhenpowerplantsarepursuingproblemsofdevicesshouldbepredicted,locatedandsolvedquickly,whileartificialpatrol,readingandrecordingcannotmeetthedemandsofefficiency,Recognizinganalogdialautomaticallyandmonitoringdialsdistributedha
3、vebeenrelatedtopowerplants’automatizationandinformatization.theformeritemisprerequisiteofextracting,fusing,mininginformationofpowerplants'devices’operatingparametersandprovidingreferencesandguidingopinionforproductionmanagement.Currentlycomputervisionismostlyadopted,whos
4、ekeytechnologiesinvolvelocatingdial’srotationcenter,extractingdial’spointercenterline,recognitionofmulti-pointerdials,andthealgorithmshouldbeSelf-adaptivetoilluminationvariation.Thesetechnologieshavegottenprogresstosomedegree,whileneithermaturenordeep,thispapertakesthesu
5、bstationrenovationsubprojectsasapplicationbackground,aimstorecognizefivekindsofanalogdialinstrumentautomaticallybasedoncomputervision.Throughcomparingwithcommonalgorithm,designsandproposesafeasiblepointmeterrecognitionscheme,theresearchcontentsandconclusionsareasfollows:
6、1Thisthesisanalyzesandsummarizestheprocessofautomaticreadingofdialimage,combinedwithwhosedesignstructure.Whilecurrentmethodneedgrabmultiimagesorcalculatetoomuchwhenlocatingdial’srotationcenter.ThisthesisproposesanewmethodbasedonimprovedCannyedgedetectionoperator,whichcan
7、acquirerotationradiusandcenterquicklybasedonsingledialimage.alsoavoiddisturbanceofdials’complexbackgroundbyselectingeffectivedisplayingregion.2Consideringdial’spointercenterlinepassingbyrotationcenter,thisthesisredesignedHoughtransformpassingbyaspecifiedpoint,Timeconsume
8、dreducedIII万方数据Abstract32fromO(N)toO(N)whenlocatingpointercenterline.Whichcanbeappliedtodial’sbinaryima
