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1、天津大學(xué)碩士學(xué)位論文早期火災(zāi)煙霧的圖像型探測技術(shù)的研究姓名：翟文鵬申請學(xué)位級別：碩士專業(yè)：控制理論與控制工程指導(dǎo)教師：吳愛國20090601ABSTRACTWiththehighgrowspeedofthepopulationandthenumberofcities，destructionsandlossesthatfirecausesbecomemoreandmoregreat．Today,therearemoreandmoreskyscrapersandbigbuildings，suchastunnelahea
2、dandwarehouse．ThetechnologyoffireimagedetectionCansatisfythatdemandduetoitsquickresponseandnoncontactingpickup．Recentlytheresearchesarefocusontheflameimagedetectionwhichisnottheearlyfn'ephenomena，SOthismethodisnotsuitableforearlyfn'edetection．Thetechnologyofsm
3、okeimagedetectionanalyses，thecolorofsmoke，however,Thisdissertationbasedontheanalysisofsmokecolorandmotiondoin-depthstudyofthesmokeimagedetectionmethods．Thesuspiciousregionsegmentationandfeaturesextractionarethetwoimportantstepofsmokeimagedetection．Inthesuspici
4、ousregionsegmentationstep，becausethebackgroundsubtractionandspatialfilteringmethodswiththedisadvantagetoeliminationofnoise．thisdissertationusestheHorn．Schunckmethodforthecalculationofopticalflowfield，thencombinesitwiththematchingblockmethodtodetectsuspiciousre
5、gion．Themethodimprovesaccuracyofsuspiciousregionsegmentation．Inthefeaturesextractionstep，becauseofthedaylightandbackgroundobjects，thesmokeimagedetectionbasedonanalysisofsmokecoloronlydowellindetectingfiresmoke．Thisdissertationextractsthreeeigenvaluesbasedonsmo
6、kecolorandmotion．Systemusestheeigenvectorwhichiscomposedbythreeeigenvaluestodeterminewhetherthereissmokebycorrespondingjudgerules．Thefirstone，accordingtoHelmholtzvelocitydecompositiontheorem，decomposesthevelocityfieldofopticalflOW,andcalculatesthelineardeforma
7、tionofthesmoketodetecttheappearanceoffiresmoke．Thesecondone．a(chǎn)ccordingtospatialdistributionofsmokebrightness，analysesthestratificationfeatureofsmoke．Thethirdone，accordingtotranslucentfeature，makesuseofthewavelettransformationcoefficientsforanalyzingthechangeoft
8、heenergyofsmokeregionandtheborderregiontOdetecttheappearanceoffiresmoke．Hardwareofexperimentalsystemiscomposedofindustrialcontrolcomputer、CCDcameraandmulti—channelvideocapturecard．
