早期火灾烟雾的图像型探测技术的研究

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1、天津大学硕士学位论文早期火灾烟雾的图像型探测技术的研究姓名：翟文鹏申请学位级别：硕士专业：控制理论与控制工程指导教师：吴爱国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．accordingtospatialdistributionofsmokebrightness，analysesthestratificationfeatureofsmoke．Thethirdone，accordingtotranslucentfeature，makesuseofthewavelettransformationcoefficientsforanalyzingthechangeoft

8、heenergyofsmokeregionandtheborderregiontOdetecttheappearanceoffiresmoke．Hardwareofexperimentalsystemiscomposedofindustrialcontrolcomputer、CCDcameraandmulti—channelvideocapturecard．