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1、AUTOMATICWHITEBALANCINGUSINGSTANDARDDEVIATIONOFRGBCOMPONENTSHong-KwaiLAM,OscarC.AUandChi-WahWONGDepartmentofElectricalandElectronicEngineering,TheHongKongUniversityofScienceandTechnology,ClearWaterBay,Kowloon,HongKong,China.Email:eekwai@ust.hk,eeau@ee.ust.hk,dickywcw@ust.hkABSTRACTusedtotransformas
2、etofnaturalimagesfromnaturallightsourceenvironmentintootherlightsourceAgoodautomaticwhitebalancingalgorithmisanenvironmentssuchthatthefinalwhite-balancedimagesessentialimagepre-processingcomponentinconsumercanbecomparedwiththeiroriginalnaturallightsourcedigitalstillcameras,anditcangreatlyimprovethe
3、finalimagestotesttheaccuracyoftheAWBalgorithmsforimagequality.Inthispaper,anovelautomaticwhitedifferentnaturalscenes.balancingalgorithmbasedonthestandarddeviationofRGBcomponentsofthepre-capturedimageisproposed.Alightsourcemodelforevaluationofanautomaticwhite2.AUTOMATICWHITEBALANCINGbalancingisalsod
4、escribed.ThesimulationresultsshowALGORITHMSthattheproposedalgorithmcanimprovethefinalimagequalityofthecapturedimage.Indigitalstillcameras,theCCD/CMOSsensorcanbeusedtoobtaintheinformationoflightsourceunderwhichtheimageisbeingshot.Beforetheactualimageiscaptured,thedatafromthesensoriscalledpre-capture
5、d1.INTRODUCTIONimageandiscontinuouslyanalyzed.MostoftheinexpensiveAWBalgorithmsmakeuseofthispre-WiththerapidadvanceofdigitalimageprocessingcapturedimagetoadjustthegainsoftheRGBchanneltechnologies,therearemanynewfeaturesindigitalstillamplifierstoachievewhitebalancing.camerasmakingthemverypopularthes
6、edays.Amongthesenewfeatures,automaticwhitebalancing(AWB)is2.1.ExistingAlgorithmsoneofimportantfeaturesindigitalstillcameras.WithoutAWB,acapturedwhiteobjectwillappearreddishunderThebasicalgorithmforAWBisknownasGrayWorldincandescentlightandbluishunderfluorescentlight.WithAssumption(GW)algorithm.Inthi
7、salgorithm,theAWB,adigitalstillcameracanautomaticallycompensateaverageR,GandBcomponents,R,GandB,oftheforthecolorshiftsduetothedifferentcolortemperaturespre-capturedimagearesettobeequal:ofthelightsourcesbyad
