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1、外文资料EdgeFeatureExtractionBasedonDigitalImageProcessingTechniquesI.INTRODUCTIONTheedgeisasetofthosepixelswhosegreyhavestepchangeandrooftopchange,anditexistsbetweenobjectandbackground,objectandobject,regionandregion,andbetweenclementandclement.Edgealwaysindwellsintwoneighbori
2、ngareashavingdifferentgreylevel.Itistheresultofgreylevelbeingdiscontinuous.Edgedetectionisakindofmethodofimagesegmentationbasedonrangenon-continuity.Imageedgedetectionisoneofthebasalcontentsintheimageprocessingandanalysis,andalsoisakindofissueswhichareunabletoberesolvedcomp
3、letelysofar.Whenimageisacquired,thefactorssuchastheprojection,mix,aberranceandnoiseareproduced.Thesefactorsbringonimagefeature'sbluranddistortion,consequentlyitisverydifficulttoextractimagefeature.Moreover,duetosuchfactorsitisalsodifficulttodetectedge.Themethodofimageedgean
4、doutlinecharacteristic'sdetectionandextractionhasbeenresearchhotinthedomainofimageprocessingandanalysistechnique.Edgefeatureextractionhasbeenappliedinmanyareaswidely.Thispapermainlydiscussesaboutadvantagesanddisadvantagesofseveraledgedetectionoperatorsappliedinthecableinsul
5、ationparametermeasurement.Inordertogainmorelegibleimageoutline,firstlytheacquiredimageisfilteredanddenoised.Intheprocessofdenoising,wavelettransformationisused.AndthendifferentoperatorsareappliedtodetectedgeincludingDifferentialoperator,Logoperator,CannyoperatorandBinarymor
6、phologyoperator.Finallytheedgepixelsofimageareconnectedusingthemethodofborderingclosed.Thenaclearandcompleteimageoutlinewillbeobtained.II.IMAGEDENOISINGAsweallknow,theactualgatheredimagescontainnoisesintheprocessofformation,transmission,receptionandprocessing.Noisesdeterior
7、atethequalityoftheimage.Theymakeimageblur.Andmanyimportantfeaturesarecoveredup.Thisbringslotsofdifficultiestotheanalysis.Therefore,themainpurposeistoremovenoisesoftheimageinthestageofpretreatment.Thetraditionaldenoisingmethodistheuseofalow-passorband-passfiltertodenoise.Its
8、shortcomingisthatthesignalisblurredwhennoisesareremoved.Thereisirreconcilablecontr
