Large-scale Crowdsourced Study for Tone Mapped HDR Pictures.[2017][IEEE Trans Image Process][10.1109tip.2017.2713945]

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1、Thisarticlehasbeenacceptedforpublicationinafutureissueofthisjournal,buthasnotbeenfullyedited.Contentmaychangepriortofinalpublication.Citationinformation:DOI10.1109/TIP.2017.2713945,IEEETransactionsonImageProcessing1Large-scaleCrowdsourcedStudyforToneMappedHDRPicturesDebarat

2、iKundu,DeeptiGhadiyaram,StudentMember,IEEE,AlanC.BovikFellow,IEEE,andBrianL.EvansFellow,IEEEAbstract—Measuringdigitalpicturequality,asperceivedbysmartphonesanddigitalSLRcamerascancreateaestheticallyhumanobservers,isincreasinglyimportantinmanyapplica-pleasingimagesbyfusingam

3、ultiply-exposedstackofimages.tionsinwhichhumansaretheultimateconsumersofvisualHDRimages,commonlyrepresentedby16or32information.Standarddynamicrange(SDR)imagesprovidebits/color/pixel,typicallyareobtainedbyblendingastackof8bits/color/pixel.Highdynamicrange(HDR)images,usuallyc

4、reatedfrommultipleexposuresofthesamescene,canprovideSDRimagesatvaryingexposurelevels,therebyallowinga16or32bits/color/pixel,butneedtobetonemappedtoSDRrangeofintensitylevelsontheorderof10,000to1.HDRfordisplayonstandardmonitors.Multi-exposurefusion(MEF)renderingalsofindsuseinc

5、omputergraphics,wherelightingtechniquesbypassHDRcreationbyfusinganexposurestackcalculationsareperformedoverawiderdynamicrange.ThisdirectlytoSDRimagestoachieveaestheticallypleasinglumi-resultsinbettercontrastvariationtherebyleadingtoahighernanceandcolordistributions.ManyHDRa

6、ndMEFdatabaseshavearelativelysmallnumberofimagesandhumanopiniondegreeofdetailpreservation.However,inordertovisualizescores,obtainedunderstringentlycontrolledconditions,therebytheseimagesonstandarddisplaydevicesdesignedforSDRlimitingrealisticviewing.Moreover,manyofthesedatab

7、asesimages,theymustbetonemappedtoSDR[2].Inadditiontoareintendedtocomparetone-mappingalgorithms,ratherthantone-mappedSDRimages,imagesarealsocreatedbymulti-beingspecializedfordevelopingandcomparingimagequalityexposurefusion,whereastackofSDRimagestakenatvaryingassessment(IQA)m

8、odels.Toovercomethesechallenges,weconductedamassivelycrowdsourcedonlinesubjectives