图像处理 灰度变换与空间滤波.pdf

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1、张萍电子科技大学光电信息学院E-mail:pingzh@uestc.edu.cnImageEnhancementContraststretchingImageEnhancementDenoisingforlowDenoisingforlow-lightimagelightimageImageEnhancementSharpeningforcircuitboardSharpeningforcircuitboardTypesofImageEnhancementintheSpatialDomain¢Single

2、pixelmethods-GrayleveltransformationsExample-Historggqramequalization-Contraststretching-Arithmetic/logicoperationsExamples-Imagesubtraction-Imageaveraging¢MultiplepixelmethodsMultiplepixelmethodsExamples:Spatialfiltering-Smoothingfilters-Sharpeningfilter

3、sWhatisspatialdomain?Thespacewhereallpixelsformanimage.Inspatialdomainwecanrepresentanimagebyf(x,y),wherexandyarecoordinatesalongxandyaxiswithrespecttoanyarecoordinatesalongxandyaxiswithrespecttoanorigin.ThereisdualitybetweenThereisdualitybetweenSpatialan

4、dSpatialandFrequencyDomainsFrequencyDomains.UsingtheFourierImaggpesinthespatialtfttransform,thhdeworddomainarepicturesinthe“distance”islostbutthex,yplanewherethewordword“frequency”“distance””iismeaningfflul.becomesalive.Whatisspatialdomain?FourierFouriert

5、ransformFouriertransformSpatialdomainFdFrequencydomaiinOutline©Background©SomeBasicIntensityTransformationFunctions©HistogramProcessing©FundamentalsofSpatialFiltering©SmoothingSpatialFilters©SharpeningSpatialFiltersSharpeningSpatialFilters©CombiningSpatia

6、lEnhancementMethods©UiFUsingFuzzyTThiechniques*3.1BackgroundAgendaF1.TheBasicsofIntensityTransformationsandSpatialFilteringF2.AbouttheExamplesinThisChapter3.1BackgroundImageenhancementsingprocessesperformedintheImageenhancementusingprocessesperformedinthe

7、SpatialdomainresultinginimagesintheSpatialdomain.WecanwrittenasWecanwrittenasggy(,)xy=T[ffy(,)xy]wheref()(x,y)iisanoriiilginaliimage,g(()x,y)iisanoutttdputandT[.]isafunctiondefinedintheareaaround(x,y).3.1Backgroundg(,)xy=T[f(,)xy]3.1BackgroundTransformsin

8、tensityofanoriginalimageintointensityofanoutputimageusingafunction:outputimageusingafunction:sTr=()wherer=inputintensityands=outputintensityOutline©Background©SomeBasicIntensityTransformationFunctions©HistogramProce