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基于数字图像处理的混凝土微裂纹定量分析技术 Abstract Withthedevelopmentofdigitalimageprocessingtechnology,quantitativeanalysisofmicrocracksinconcretehasbecomeanimportantresearchdirectioninthefieldofmaterialsscience.Thispaperpresentsareviewofthecurrentresearchonquantitativeanalysisofmicrocracksinconcretebasedondigitalimageprocessingtechnology.Firstly,thecharacteristicsofmicrocracksinconcreteareanalyzed,followedbyanintroductionofthemethodsforacquiringandprocessingconcretemicrocrackimages.Then,severalimageprocessingalgorithmsforquantitativeanalysisofmicrocracksinconcretearereviewedandcompared,includingcrackdetection,segmentation,andmeasurement.Furthermore,thechallengesandfuturedirectionsforquantitativeanalysisofmicrocracksinconcretearediscussed. Introduction Concreteiswidelyusedasaconstructionmaterialduetoitssuperiorstrength,durability,andlowcost.However,microcracksoftenappearinconcreteovertime,whichcancausestructuraldamageandfailure.Microcracksinconcreterefertocrackswithawidthoflessthan0.1mm,whicharedifficulttodetectandquantifyvisually.Therefore,itisnecessarytodevelopaquantitativeanalysismethodformicrocracksinconcrete. Digitalimageprocessingtechnologyprovidesapowerfultoolformicrocrackanalysisinconcrete.Theincreasingavailabilityofhigh-resolutiondigitalcamerasandthedevelopmentofimageprocessingalgorithmshavefacilitatedquantitativeanalysisofmicrocracksinconcrete. AcquiringandProcessingConcreteMicrocrackImages Acquiringhigh-qualityconcretemicrocrackimagesisthebasisofquantitativeanalysisofmicrocracksinconcrete.Themostcommonlyusedmethodforobtainingmicrocrackimagesistotakeaphotooftheconcretesurfaceusingahigh-resolutioncameraequippedwithamacrolens.Inordertoobtainclearimages,itisnecessarytocleantheconcretesurfaceandfillthemicrocrackswithasuitabledyeorfillertoenhancethecontrast. Processingconcretemicrocrackimagesincludesimageenhancement,denoising,segmentation,andmeasurement.Imageenhancementisusedtoimprovethecontrastandbrightnessoftheimage,sothatthemicrocrackscanbeclearlydistinguishedfromthesurroundin