磁化曲线和磁滞回线测量概要

KalleKarn,etc.FingerprintClassification.PatternRecognition,1996,29(3:389-404.RathaNK,ChenSY,JainAK.Adaptivefloworientation-basedfeatureextractioninfingerprintimages.PatternRecognition,1995,28(10:1657-1672.HongL,WanYF,JainA.Fingerprintimageenhancement:algorithmandperformaneeevaluation.工EEETransonPAMI,1998,20(8:777-789.HeY,KunduA.2DshapeclassificationusinghiddenMarkovmodels.IEEETransactionsonPAMI,1991,13(11:11721181.LiangKH,TjahjadiT,YangYH.RoofedgedetectionusingregularizedcubicB一splinefitting.PatternRecognition,1997,30(5:719-728.StockmanG,KopsteinS,BenettS.Matchingimagestomodelsforregistrationanddetectionviaclustering.工EEE,TransactionsonPatternAnalysisandMachineintelligenee.1982,2(3:229-211.XudongJiang,WeiyunYau.FingerprintMinutiaeMatchingBasedontheLocalandGlobalStructures.IEEE,2000,1038-1041.ContiV,MilitelloC,SorbelloRetal.Introducingpseudo-singularitypointsforefficientfingerprintsclassificationandrecognition[J].CISIS,2010:368-375.B.MoayerandK.Fu.Atreesystemapproachforfingerprintpatternrecognition[J].PatternRecognition.1990,23(8:893-904.B.Chatterjee,M.VermaandA.Majumdar.Edgedetectioninfingerprints[J].PatternRecognition.1987,20:513-523.MehtreB.M,MuthyN.N,KapoorS,etat.Segmentationoffingerprintimageusingthedirectionimage[J].PatternRecognition.1987,20(4:429-435.一1460.XudongJiang,WeiyunYauandWeeSer.Minutiaeextractionbyadaptivetracingthegraylevelridgeofthefingerprintimage[C].IEEE6InternationalConferenceonImageProcessing,Japan.1999:852-856.J.D丄iu,Z.Huang,K.L.Chan.Minutiaeextractionfromgray-levelfingerprintimagebyrelationshipexamination[J].IEEE.ImageProcessing,2002,2(9:10-13.O'Gonnan,Nickerson.anApproachtoFingerprintFilterDesign[J].PatternRecognition,1989,22(1:29-38.附录1配准函数Matlab程序function[outputGreg]=dftregistration(buf1ft,buf2ft,usfac%function[outputGreg]=dftregistration(buf1ft,buf2ft,usfac;%Efficientsubpixelimageregistrationbycrosscorrelation.Thiscode%givesthesameprecisionastheFFTupsampledcrosscorrelationina%smallfractionofthecomputationtimeandwithreducedmemory%requirements.Itobtainsaninitialestimateofthecrosscorrelationpeak%byanFFTandthenrefinestheshiftestimationbyupsamplingtheDFT%onlyinasmallneighborhoodofthatestimatebymeansofa%matrix-multiplyDFT.Withthisprocedurealltheimagepointsareusedto%computetheupsampledcrosscorrelation.%ManuelGuizar-Dec13,2007%PortionsofthiscodeweretakenfromcodewrittenbyAnnM.Kowalczyk%J.R.FienupandA.M.Kowalczyk,"Phaseretrievalforacomplex-valued%objectbyusingalow-resolutionimage,"J.Opt.Soc.Am.A7,450-458%(1990.%Citationforthisalgorithm:%ManuelGuizar-Sicairos,SamuelT.Thurman,andJamesR.Fienup,%"Efficientsubpixelimageregistrationalgorithms,"Opt.Lett.33,%156-158(2008.%Inputs%buf1ftFouriertransformofrefereneeimage,%DCin(1,1[DONOTFFTSHIFT]%buf2ftFouriertransformofimagetoregister,%DCin(1,1[DONOTFFTSHIFT]%usfacUpsamplingfactor(integer.Imageswillberegisteredto%within1/usfacofapixel.Forexampleusfac=20meansthe%imageswillberegisteredwithin1/20ofapixel.(default=1%Outputs%output=[error,diffphase,net_row_shift,net_col_shift]%errorTranslationinvariantnormalizedRMSerrorbetweenfandg%diffphaseGlobalphasediffereneebetweenthetwoimages(shouldbe%zeroifimagesarenon-negative.%netrowshiftnetcolshiftPixelshiftsbetweenimages%Greg(OptionalFouriertransformofregisteredversionofbuf2ft,剩磁Br=98.7mT;矫顽力为：HC=A/M五、讨论与思考1、根据磁滞回线的形状，如何区分软磁材料和硬磁材料?2、简要说明软磁材料和硬磁材料的常用材料及用途