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1、JournalofMaterialsProcessingTechnology172(2006)195201On-linemeasurementofdepositdimensioninsprayformingusingimageprocessingtechnologyQuYing-donga,∗,CuiCheng-songa,ChenShan-benb,LiQing-chunaaSchoolofMaterialScienceandEngineering,HarbinInstituteofTechnology,150001Harbin,ChinabSchoolofMate
2、rialScienceandEngineering,ShanghaiJiaotongUniversity,200030Shanghai,ChinaReceived27May2003;receivedinrevisedform3August2005;accepted19October2005AbstractImageprocessingtechnology,whichoffersanewapproachforon-linedepositdimensionmeasurementinsprayforming,hasbeendevelopedinthispaper.First
3、,anadaptivesmoothingoperatorisusedtoeliminatenoisebasedonanalysisoftheresourceofimagenoise.Second,anewedgedetectionoperatorSobel–Zernikemomentsoperatorisusedtodetecttheedgeofdepositimage.Lastly,thecharacteristicdepositdimensionsuchasouterdiameterofatubulardepositiscalculated.Testofthisn
4、ewimageprocessingmethodshowsthatthewholerunningtimeofoneimageprocessingislessthan0.987s,whiletherelativeerrorofdepositdimensionmeasurementislowerthan0.32%,indicatingthatthisisanon-lineaccuratemeasurementmethodfordepositdimensioninsprayformingprocess.©2005ElsevierB.V.Allrightsreserved.Ke
5、ywords:Sprayforming;Depositdimension;On-linemeasurement;Imageprocessing1.Introductionon-lineprocesscontrol.Inearlierreportsaboutimageprocess-ingtechnology,infraredthermalimagingcamerahasbeenusedInsprayformingprocess,liquidmetalisatomizedbyhightomeasuredepositsurfacetemperature,staticnoz
6、zletempera-speedinertgasintovariouslysizeddroplets,whicharethenpro-ture,transientnozzletemperatureandmelttemperatureduringpelledawayfromtheregionofatomizationandsprayedtowardspraydeposition[3,4].However,manyproblemsmustbesolvedamovingsubstratetoformanearfullydenseandnear-netshapesuchasw
7、avelengthchoice,opticalaccess,contamination,signalpreform[1,2].Thedimensionprecisionofthenear-netpreformattenuationandsystemcalibrationbeforeusinginfraredther-canbeimprovedbyusingprocesscontroltechnology.Toachievemalimagingtechnology.Inthisstudy,anormalCCDcamerathisgoal,thedepo
