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1、DigitalImageProcessingChapter5:ImageRestoration23June2006(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.ConceptofImageRestorationImagerestorationistorestoreadegradedimagebacktotheoriginalimagewhileimageenhancementistomanipulatetheimagesothat
2、itissuitableforaspecificapplication.Degradationmodel:whereh(x,y)isasystemthatcausesimagedistortionandh(x,y)isnoise.NoiseModelsNoisecannotbepredictedbutcanbeapproximatelydescribedinstatisticalwayusingtheprobabilitydensityfunction(PDF)Gaussiannoise:RayleighnoiseErlang(Gamma
3、)noiseNoiseModels(cont.)ExponentialnoiseUniformnoiseImpulse(salt&pepper)noise(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.PDF:StatisticalWaytoDescribeNoisePDFtellshowmucheachzvalueoccurs.(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalI
4、mageProcessing,2ndEdition.ImageDegradationwithAdditiveNoiseOriginalimageHistogramDegradedimages(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.OriginalimageHistogramDegradedimagesImageDegradationwithAdditiveNoise(cont.)(ImagesfromRafaelC.Gonz
5、alezandRichardE.Wood,DigitalImageProcessing,2ndEdition.PeriodicNoisePeriodicnoiselookslikedotsInthefrequencydomain(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.EstimationofNoiseWecannotusetheimagehistogramtoestimatenoisePDF.Itisbettertouset
6、hehistogramofoneareaofanimagethathasconstantintensitytoestimatenoisePDF.(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.PeriodicNoiseReductionbyFreq.DomainFilteringBandrejectfilterRestoredimageDegradedimageDFTPeriodicnoisecanbereducedbysettin
7、gfrequencycomponentscorrespondingtonoisetozero.(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.BandRejectFiltersUsetoeliminatefrequencycomponentsinsomebandsPeriodicnoisefromthepreviousslidethatisFilteredout.(ImagesfromRafaelC.GonzalezandRicha
8、rdE.Wood,DigitalImageProcessing,2ndEdition.NotchRejectFiltersAnotchrejectfilterisusedtoeliminate
