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1、EdgeFeatureExtractionBasedonDigitalImageProcessingTechniquesAbstractEdgedetectionisabasicandimportantsubjectincomputervisionandimageprocessing.Inthispaperwediscussseveraldigitalimageprocessingtechniquesappliedinedgefeatureextraction.Firstly,wavelettransformisusedtoremo
2、venoisesfromtheimagecollected.Secondly,someedgedetectionoperatorssuchasDifferentialedgedetection,Logedgedetection,CannyedgedetectionandBinarymorphologyareanalyzed.Andthenaccordingtothesimulationresults,theadvantagesanddisadvantagesoftheseedgedetectionoperatorsarecompar
3、ed.ItisshownthattheBinarymorphologyoperatorcanobtainbetteredgefeature.Finally,inordertogainclearandintegralimageprofile,themethodofborderingclosedisgiven.Afterexperimentation,edgedetectionmethodproposedinthispaperisfeasible.Index：Terms-Edgedetection,digitalimageprocess
4、ing,operator,waveletanalvsisI.INTRODUCTIONTheedgeisasetofthosepixelswhosegreyhavestepchangeandrooftopchange,anditexistsbetweenobjectandbackground,objectandobject,regionandregion,andbetweenclementandclement.Edgealwaysindwellsintwoneighboringareashavingdifferentgreylevel
5、.Itistheresultofgreylevelbeingdiscontinuous.Edgedetectionisakindofmethodofimagesegmentationbasedonrangenon-continuity.Imageedgedetectionisoneofthebasalcontentsintheimageprocessingandanalysis,andalsoisakindofissueswhichareunabletoberesolvedcompletelysofar.Whenimageisacq
6、uired,thefactorssuchastheprojection,mix,aberranceandnoiseareproduced.Thesefactorsbringonimagefeature'sbluranddistortion,consequentlyitisverydifficulttoextractimagefeature.Moreover,duetosuchfactorsitisalsodifficulttodetectedge.Themethodofimageedgeandoutlinecharacteristi
7、c'sdetectionandextractionhasbeenresearchhotinthedomainofimageprocessingandanalysistechnique.Edgefeatureextractionhasbeenappliedinmanyareaswidely.Thispapermainlydiscussesaboutadvantagesanddisadvantagesofseveraledgedetectionoperatorsappliedinthecableinsulationparameterme
8、asurement.Inordertogainmorelegibleimageoutline,firstlytheacquiredimageisfilteredanddenoised.Intheprocessofdenoising,w
