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1、SubmittedtoImageAnalStereol,9pagesOriginalResearchPaperBLINDCONTRASTENHANCEMENTASSESSMENTBYGRADIENTRATIOINGATVISIBLEEDGESNICOLASHAUTIÈRE1,JEAN-PHILIPPETAREL1,DIDIERAUBERT2ANDÉRICDUMONT11LCPC,DivisionforRoadOperation,SignallingandLighting,58bldLefebvre,75732ParisCedex15,Fra
2、nce,2INRETS-LCPC,Vehicle-Infrastructure-DriverInteractionsResearchUnit,building824,14routedelaMinière,78000Versailles,Francee-mail:nicolas.hautiere@lcpc.fr,jean-philippe.tarel@lcpc.fr,didier.aubert@inrets.fr,eric.dumont@lcpc.fr(Submitted)ABSTRACTThecontrastofoutdoorimagesa
3、cquiredunderadverseweatherconditions,especiallyfoggyweather,isalteredbythescatteringofdaylightbyatmosphericparticles.Asaconsequence,differentmethodshavebeendesignedtorestorethecontrastoftheseimages.However,thereisalackofmethodologytoassesstheperformancesofthemethodsortorat
4、ethem.Unlikeimagequalityassessmentorimagerestorationareas,thereisnoeasywaytohaveareferenceimage,whichmakestheproblemnotstraightforwardtosolve.Inthispaper,anapproachisproposedwhichconsistsincomputingtheratiobetweenthegradientofthevisibleedgesbetweentheimagebeforeandaftercon
5、trastrestoration.Inthisway,anindicatorofvisibilityenhancementisprovidedbasedontheconceptofvisibilitylevel,commonlyusedinlightingengineering.Finally,themethodologyisappliedtocontrastenhancementassessmentandtothecomparisonoftone-mappingoperators.Keywords:advanceddriverassist
6、ancesystem,blindassessment,contrastrestoration,contrastenhancement,edgessegmentation,LIPmodel,tone-mapping,visibilitylevel.INTRODUCTIONalgorithm.Finally,basedonthisresult,anindicatorofvisibilityenhancementisderived.ThecontrastofoutdoorimagesacquiredunderThearticleisorganiz
7、edasfollows.First,theadverseweatherconditions,especiallyfoggyweather,visibilitymodelofAdrian(1989)ispresentedasisalteredbythescatteringofdaylightbyatmosphericwellashowtouseittoderiveablindcontrastparticles(NarasimhanandNayar,2002).Asarestorationassessmentmethodbasedonvisib
8、leconsequence,differentmethodshavebeendesignededgesratioing.Second,theproposedmethodology
