手机模组影像质量评价标准-(试用版2.1)-Longyu

No:SDC07JLT03A手机模组影像质量评价标准(试用版2.1)CameraModuleImageQualityEvaluationCriterionOmniVisionTechnologiesInc.OVTConfidential,ForLongyuNo:SDC07JLT03ARevisionHistoryRev.DateChangeAuthor1.02007.06.14FirstdraftKellyYan1.0.12007.07.06AddflaretestKellyYan1.0.22007.07.06AddtestequipmentsandprocedureKellyYan2.02008.4.10Modifytestcondition--LuminanceKellyYan2.12008.07.05Add3MResolutionstandard,modifytestconditionKellyYan模组评测主要技术指标CameraModuleTechnicalCharacteristics●分辨率Resolution●色彩还原ColorAccuracy/Saturation●亮度均一性LensShading●颜色均一性ColorUniformity●白平衡WhiteBalance●灰阶GrayScale●信噪比SNR●畸变TVDistortion(Reference)●视场角FieldofView(Reference)●景深DOF--Depthoffield(Reference)●耀斑Flare(Reference)●感光度Sensitivity(optional)●Macro(optional)●AF(optional)●场景SceneOmniVisionTechnologiesInc.OVTConfidential,ForLongyuNo:SDC07JLT03A1.ResolutionConditionImageformat:YUVChart:ISO12233orEIA(VGA)ChartSurfaceLuminance:500+/-100LuxLess10%luminousvariationinthewholechartsurface.Unit:Lp/mm----ISO12233,TVline----EIAEquipment1.ISO12233ChartorEIA(VGA)chartISO12233PS:Thischartis16:9.Sowhenyoucaptureimage,youshouldaimatthe4:3arrowarea.EIA2.Lightsource–StudiolightorLightboothModelCoollit027Power36wColortemperature5500kVoltage220vFrequency50HZCurrent210mA3.JigandfixtureOmniVisionTechnologiesInc.OVTConfidential,ForLongyuNo:SDC07JLT03A1.ResolutionProcedure1.Setthecameramoduleindefaultsetting.EnableAWB,AECandAGC.2.Setupthelightcondition:less10%variationinluminousamongthewholechart.Thetestchartshallbeuniformlyilluminatedasshownbelow.Analysis1.VisualResolutionalwayskeepsubjectjudgment.Toreducethissubjectfactor,pleaseuse30DNasblack–whitelinepairthreshold.2.ResultSensorTypeCaptureDistancePositionGoodPassVGA40cmCenter350250Corner3002001.3M80cmCenter600500Corner5004002M1m/1.2mCenter800700Corner7006003M1m/1.5mCenter1000900Corner900800OmniVisionTechnologiesInc.OVTConfidential,ForLongyuNo:SDC07JLT03A2.ColorAccuracyConditionImageformat:YUVChart:GretagMacbethColorCheckerLightSource:LightboothD65Colortemperature:6500KChartSurfaceLuminance:600+/-200LuxLess10%luminousvariationinthewholechartsurface.Capturedistance:60~80cm.Thecolorcheckerareatakeslessthan75%ofthewholeimageispreferred.AERequirement:Theimageluminanceofblock19mustbemorethan230DN,butlessthan250DNEquipment1.ColorChecker2.Lightbooth3.JigandfixturetoholdthecameramoduleisnecessaryProcedure1.Setthecameramoduleindefaultsetting.EnableAWB,AECandAGC.2.PutcolorcheckerinthelightboxandsetDaylightasthesourcelight.3.Thewholecolorcheckerwilltakelessthan75%ofthecapturescreen.4.Capturethecolorchecker.5.Analyzeitbysoftware.Analysis1.GeteachblockROIaverageRGBvalueandchangethemtoLabcolorspace.ROI=30%block.2.GeteachblockdeltaC∆C=Sqrt((a-a*)2+(b-b*)2)3.Calculatetheaverage∆Coftotal24block.4.GeteachblockdeltaE∆E=Sqrt((L-L*)2+(a-a*)2+(b-b*)2)5.Calculatetheaverage∆Eoftotal24block6.Getthesaturationvalueofblock1toblock18Sat=(sqrt(a2+b2))/(sqrt(a*2+b*2))7.GettheaverageSaturationvalueof1~18block.OmniVisionTechnologiesInc.OVTConfidential,ForLongyuNo:SDC07JLT03A2.ColorAccuracyPS:L,a,bismeasuredvalue;L*,a*,b*isstandardvalue.(PleasereferAnnex-A)8.ResultGoodPassColorError--∆C812ColorError--∆E1015Saturation115%~130%100%3.LensshadingConditionSetting:Lenscorrectionon/offChart:whitepaperorevenplanesourceLightSourceLuminance:300~800LuxCapturedistance:2~5cmBlocksize:32*32pixel*(center+4fullcorner)----VGA/1.3M128*128pixel*(center+4fullcorner)----2M/3MEquipment1.Evenlightsource----CCSLEDRadiation2.JigandfixturetoholdthecameramoduleisnecessaryProcedure1.Setcameradefaultsetting,AWB,AGC,AECon.Lenscorrectionoff.2.Settheanalysisblocksize(VGA/1.3Mis32*32and2M/3Mis128*128)3.Settheanalysiscornerposition----Fullcorner4.CapturetheLEDscreenandgetresult.OmniVisionTechnologiesInc.OVTConfidential,ForLongyuNo:SDC07JLT03A3.Lensshading5.Lenscorrectionon.6.Repeatstet2to4.Analysis1.CalculateYofcenterandcornerROIblocktogetcorner/centerproportion.2.ResultLuminanceshadingConditionGoodPassCorner/Center*100%Lenscorroff60%50%Lenscorron80%75%4.ColorUniformityConditionSetting:Lenscorrectionon/offChart:Evenplanesourceor18%grayscaleLuminance:300~800LuxColortemperature:6000~6500KCapturedistance:2~5cmEquipment1.Evenlightsource----CCSLEDRadiation(6300K)2.18%graychartIfusingthischart,youneedD65lightinthelightbooth.3.JigandfixturetoholdthecameramoduleisnecessaryProcedure1.Setcameradefaultsetting,AWB,AGC,AECon.Lenscorrectionon.2.Ifyouusegraychartastarget,pleaseconfirmthatless10%luminousvariationinthewholechartOmniVisionTechnologiesInc.OVTConfidential,ForLongyuNo:SDC07JLT03A4.ColorUniformitysurface.3.Divideimageto8*8=64blockandstatistictheoutsideroundblock.4.CapturetheLEDscreenor18%graychartandanalysisbythesoftwareAnalysis1.GettheaverageRGBvalueofeachblockandconvertthemtoHSV2.UsingS–HSVasevaluatedindex.TheSrangeis0~1.0.3.GetthemaxSvalue.4.ResultColorshadingGoodPassS(max)0.10.25.WhiteBalanceConditionImageformat:YUVChart:MacbethColorCheckerCondition:lightbooth+colortemperaturefilterColortemperature:2800K~8500K(2800K(Alight),4100K(CWFlight),6500K(Day),8500K(Day+C4),othercolortemperatureopti