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1、IEEETRANSACTIONSONPATTERNANALYSISANDMACHINEINTELLIGENCE,VOL.12,NO.I,JANUARY199055MultichannelTextureAnalysisUsingLocalizedSpatialFiltersALANCONRADBOVIK,MEMBER,IEEE,MARIANNACLARK,MEMBER,IEEE,ANDWILSONS.GEISLERAbstract-Acomputationalapproachforanalyzingvisibletexturesillumination,shadowing,andsurfac
2、ereflectancepatterns,isdescribed.Texturesaremodeledasirradiancepatternscontainingasurfacetopologiesandself-occlusions,andperspectivelimitedrangeofspatialfrequencies,wheremutuallydistincttexturesdistortioneffectsthatmustbeconsidered.differsignificantlyintheirdominantcharacterizingfrequencies.Byenco
3、dingimagesintomultiplenarrowspatialfrequencyandorienta-However,muchprogresscanbemadetowardsdevel-tionchannels,theslowly-varyingchannelenvelopes(amplitudeandopingtextureanalysistechniquesbyexaminingtheprob-phase)areusedtosegregatetexturalregionsofdifferentspatialfre-leminthepost-imageformationsetti
4、ng.Indoingso,aquency,orientation,orphasecharacteristics.Thus,aninterpretationperceptualsurfacetexturemaybeinformallydefinedtoofimagetextureasaregioncode,orcurrierofregioninformation,isbeaspatialpatternoflocalsurfaceradiancesgivingriseemphasized.Thechannelfiltersused,knownasthe2-DGaborfunctions,are
5、toaperceptionofsurfacehomogeneity.Withinthiscon-usefulforthesepurposesinseveralsenses:theyhavetunableorienta-text,animagetexturemaybedefinedasalocalarrange-tionandradialfrequencybandwidths,tunablecenterfrequencies,andmentofimageirradiancesprojectedfromasurfacepatchoptimallyachievejointresolutionin
6、spaceandinspatialfrequency.Byofperceptuallyhomogeneousradiances.comparingthechannelamplituderesponses,boundariesbetweentex-Attributesgivingrisetoasenseofperceptualhomo-turescanbedetected.Bylocatinglargevariationsinthechannelphaseresponses,discontinuitiesintexturephasecanbedetected.Examplesgeneityh
7、avebeenconstruedtoincludesuchspatiohem-aregivenofbothtypesoftextureprocessingusingavarietyofrealandporalsurfacepropertiesascolor,relativedepth,motion,synthetictextures.andflickerrate[11.Whileintegratingtheseprope
