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ID:8795090
大小:223.00 KB
页数:11页
时间:2018-04-08
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1、附录A3ImageEnhancementintheSpatialDomainTheprincipalobjectiveofenhancementistoprocessanimagesothattheresultismoresuitablethantheoriginalimageforaspecificapplication.Thewordspecificisimportant,becauseitestablishesattheoutsetthanthetechniquesdiscussedinthisc
2、hapterareverymuchproblemoriented.Thus,forexample,amethodthatisquiteusefulforenhancingX-rayimagesmaynotnecessarilybethebestapproachforenhancingpicturesofMarstransmittedbyaspaceprobe.Regardlessofthemethodused.However,imageenhancementisoneofthemostinteresti
3、ngandvisuallyappealingareasofimageprocessing.Imageenhancementapproachesfallintotwobroadcategories:spatialdomainmethodsandfrequencydomainmethods.Thetermspatialdomainreferstotheimageplaneitself,andapproachesinthiscategoryarebasedondirectmanipulationofpixel
4、sinanimage.Fouriertransformofanimage.Spatialmethodsarecoveredinthischapter,andfrequencydomainenhancementisdiscussedinChapter4.Enhancementtechniquesbasedonvariouscombinationsofmethodsfromthesetwocategoriesarenotunusual.Wenotealsothatmanyofthefundamentalte
5、chniquesintroducedinthischapterinthecontextofenhancementareusedinsubsequentchaptersforavarietyofotherimageprocessingapplications.Thereisnogeneraltheoryofimageenhancement.Whenanimageisprocessedforvisualinterpretation,thevieweristheultimatejudgeofhowwellap
6、articularmethodworks.Visualevaluationofimagequalityisahighlyishighlysubjectiveprocess,thusmakingthedefinitionofa“goodimage”anelusivestandardbywhichtocomparealgorithmperformance.Whentheproblemisoneofprocessingimagesformachineperception,theevaluationtaskis
7、somewhateasier.Forexample,indealingwithacharacterrecognitionapplication,andleavingasideotherissuessuchascomputationalrequirements,thebestimageprocessingmethodwouldbetheoneyieldingthebestmachinerecognitionresults.However,eveninsituationswhenaclear-cutcrit
8、erionofperformancecanbeimposedontheproblem,acertainamountoftrialanderrorusuallyisrequiredbeforeaparticularimageenhancementapproachisselected.3.1BackgroundAsindicatedpreviously,thetermspatialdomainreferstotheaggregateofpixe
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