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1、DigitalImageProcessingChapter6:ColorImageProcessing6July2005(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.SpectrumofWhiteLight1666SirIsaacNewton,24yearold,discoveredwhitelightspectrum.(ImagesfromRafaelC.GonzalezandRichardE.Wood,Digita
2、lImageProcessing,2ndEdition.ElectromagneticSpectrumVisiblelightwavelength:fromaround400to700nm1.Foranachromatic(monochrome)lightsource,thereisonly1attributetodescribethequality:intensity2.Forachromaticlightsource,thereare3attributestodescribethequality:Radiance=tota
3、lamountofenergyflowfromalightsource(Watts)Luminance=amountofenergyreceivedbyanobserver(lumens)Brightness=intensity(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.SensitivityofConesintheHumanEye6-7millionsconesinahumaneye-65%sensitivetoR
4、edlight-33%sensitivetoGreenlight-2%sensitivetoBluelightPrimarycolors:DefinedCIEin1931Red=700nmGreen=546.1nmBlue=435.8nmCIE=CommissionInternationaledel’Eclairage(TheInternationalCommissiononIllumination)PrimaryandSecondaryColorsPrimarycolorPrimarycolorPrimarycolorSec
5、ondarycolors(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.PrimaryandSecondaryColors(cont.)Additiveprimarycolors:RGBuseinthecaseoflightsourcessuchascolormonitorsSubtractiveprimarycolors:CMYuseinthecaseofpigmentsinprintingdevicesRGBaddt
6、ogethertogetwhiteWhitesubtractedbyCMYtogetBlackHue:dominantcolorcorrespondingtoadominantwavelengthofmixturelightwaveSaturation:Relativepurityoramountofwhitelightmixedwithahue(inverselyproportionaltoamountofwhitelightadded)Brightness:IntensityColorCharacterizationHue
7、SaturationChromaticityamountofred(X),green(Y)andblue(Z)toformanyparticularcoloriscalledtristimulus.(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.CIEChromaticityDiagramTrichromaticcoefficients:xyPointsontheboundaryarefullysaturatedcolo
8、rs(ImagesfromRafaelC.GonzalezandRichardE.Wood,DigitalImageProcessing,2ndEdition.ColorGamutofColorMonitorsandPrintingDevicesColorMonitorsPr