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数码相机性能评测实验一视觉分辨率及空间频率响应(SFR)测试实验目的:1、理解数码相机视觉分辨率的定义及其度量单位。2、了解数码相机分辨率测试标准ISO12233以及GB/T19953-2005《数码相机分辨率的测量》,熟悉测试标板构成,掌握其使用方法。3、掌握数码相机视觉分辨率测试方法,能够通过目视判别数码相机的分辨率特性。4、了解数码相机空间频率响应(SFR)的测试原理,理解空间频率响应(SFR)曲线的含义。5、掌握数码相机空间频率响应(SFR)的测试方法,能够通过SFR曲线判别数码相机的分辨率特性。实验要求:1、使用数码相机拍摄ISO12233标准分辨率靶板,要求连续拍摄三幅图。2、目视判别数码相机的视觉分辨率,需分别判别水平、垂直、和斜45度方向的视觉分辨率(注意:若拍摄的靶板有效区域高度仅占据相机幅面高度的一部分,需将目视判别结果乘以修正系数以得到真实的测量结果。修正系数=以像素为单位的相机幅面高度/以像素为单位的靶板有效区域高度)。3、使用Imatest软件测量数码相机空间频率响应(SFR)曲线,需分别测量水平及垂直方向的SFR,并取MTF50、MTF20作为测量结果,与视觉分辨率测试结果进行比较。1、使用数码相机拍摄ISO12233标准分辨率靶板,要求连续拍摄三幅图第一张图第二张图第三张图2、目视判别数码相机的视觉分辨率,需分别判别水平、垂直、和斜45度方向的视觉分辨率第一张图的截图:水平条测中心垂直视觉分辨率竖直条测中心水平分辨率对角线条测斜向上45°视觉分辨率第二张图的截图:水平条测中心垂直视觉分辨率竖直条测中心水平分辨率对角线条测斜向上45°视觉分辨率第三张图的截图:水平条测中心垂直视觉分辨率竖直条测中心水平分辨率对角线条测斜向上45°视觉分辨率相机型号iPhone5123平均值水平方向视觉分辨率1450128013301320垂直方向视觉分辨率1240122012601240斜向上45°视觉分辨率900900900900实验人员实验日期2014.11.17明确相机型号、相机基本设置。3、使用Imatest软件测量数码相机空间频率响应(SFR)曲线,需分别测量水平及垂直方向的SFR,并取MTF50、MTF20作为测量结果,与视觉分辨率测试结果进行比较。过程由黑到白由白到黑次数1垂直方向2垂直方向3水平方向4水平方向5垂直方向6垂直方向7水平方向8水平方向分辨率(LW/PH)10881172158515421265130412441151均值(LW/PH)1130156412851198第一次目视(LW/PH)1240145012401450实验运行结果依次如下:IMG_2250.JPG-6-4-20246810Pixels(Horizontal)Edgeprofile(linear)10-90%rise=2.35pixels=1042perPHRGBrise=2.382.352.28pxlsRMSEdgeroughness=0.0745pxlsChartcontrast=10Gamma(fromchart)=0.755Lt,dklvls=217.2,38.2Lt/dk=5.68Imatest4.0.15ImageSensorEdgeprofile:Horizontal23-Nov-201417:31:273264x2448pixels(WxH)7.99MpxlsROI:100x440pixels27%abovectrY-channel(YA27)Gamma=0.50Edge-6.85degs00.20.40.60.8100.20.40.60.81Frequency,Cycles/pixelSFR(MTF)EvaluationversionPurchaseat=0.222Cy/Pxl=1088LW/PH(RGB)=0.220.2220.23Cy/PxlMTF50P=0.222C/P=1088LW/PHUndersharpening29.2%MTF50=0.222Cy/PxlMTF20=0.377Cy/PxlMTFatNyquist=0.125NyquistfMTF:Horizontalw/NR+++ROI:100x440pixelsLRTB=16801779460899Edgeangle=-6.85degsEstm.chartcontrast=32.3SelectedEXIFdataModel:ISO:FL:Exp:Aper:Lens:IMG_2250.JPG-6-4-20246810Pixels(Horizontal)Edgeprofile(linear)10-90%rise=2.09pixels=1172perPHRGBrise=2.12.092.03pxlsRMSEdgeroughness=0.0739pxlsChartcontrast=10Gamma(fromchart)=0.75Lt,dklvls=217.1,38.6Lt/dk=5.62Imatest4.0.15ImageSensorEdgeprofile:Horizontal23-Nov-201417:33:193264x2448pixels(WxH)7.99MpxlsROI:100x238pixels21%abovectrY-channel(YA21)Gamma=0.50Edge-6.83degs00.20.40.60.8100.20.40.60.81Frequency,Cycles/pixelSFR(MTF)EvaluationversionPurchaseat=0.254Cy/Pxl=1241LW/PH(RGB)=0.2520.2520.263Cy/PxlMTF50P=0.254C/P=1241LW/PHUndersharpening24.7%MTF50=0.254Cy/PxlMTF20=0.423Cy/PxlMTFatNyquist=0.144NyquistfMTF:Horizontalw/NR+++ROI:100x238pixelsLRTB=16641763691928Edgeangle=-6.83degsEstm.chartcontrast=31.6SelectedEXIFdataModel:ISO:FL:Exp:Aper:Lens:IMG_2250.JPG-6-4-20246810Pixels(Vertical)Edgeprofile(linear)10-90%rise=1.59pixels=1537perPHRGBrise=1.61.591.6pxlsRMSEdgeroughness=0.0741pxlsChartcontrast=10Gamma(fromchart)=0.841Lt,dklvls=210.7,30.4Lt/dk=6.93Imatest4.0.15ImageSensorEdgeprofile:Vertical23-Nov-201417:42:223264x2448pixels(WxH)7.99MpxlsROI:363x87pixels9.3%belowctrY-channel(YB9)Gamma=0.50Edge6.14degs00.20.40.60.8100.20.40.60.81Frequency,Cycles/pixelSFR(MTF)EvaluationversionPurchaseat=0.324Cy/Pxl=1585LW/PH(RGB)=0.3250.3230.325Cy/PxlMTF50P=0.324C/P=1585LW/PHUndersharpening17.1%MTF50=0.324Cy/PxlMTF20=0.479Cy/PxlMTFatNyquist=0.173NyquistfMTF:Verticalw/NR+++ROI:363x87pixelsLRTB=1435179713701456Edgeangle=6.14degsEstm.chartcontrast=48SelectedEXIFdataModel:ISO:FL:Exp:Aper:Lens:IMG_2250.JPG-6-4-20246810Pixels(Vertical)Edgeprofile(linear)10-90%rise=1.66pixels=1473perPHRGBrise=1.661.661.66pxlsRMSEdgeroughness=0.0809pxlsChartcontrast=10Gamma(fromchart)=0.848Lt,dklvls=212.1,30.1Lt/dk=7.05Imatest4.0.15ImageSensorEdgeprofile:Vertical23-Nov-201417:45:123264x2448pixels(WxH)7.99MpxlsROI:280x155pixels11%below-RofctrY-channel(YBR11)Gamma=0.50Edge6.35degs00.20.40.60.8100.20.40.60.81Frequency,Cycles/pixelSFR(MTF)EvaluationversionPurchaseat=0.315Cy/Pxl=1542LW/PH(RGB)=0.3170.3130.316Cy/PxlMTF50P=0.315C/P=1542LW/PHUndersharpening18.0%MTF50=0.315Cy/PxlMTF20=0.476Cy/PxlMTFatNyquist=0.175NyquistfMTF:Verticalw/NR+++ROI:280x155pixelsLRTB=1597187613491503Edgeangle=6.35degsEstm.chartcontrast=49.7SelectedEXIFdataModel:ISO:FL:Exp:Aper:Lens:IMG_2250.JPG-6-4-20246810Pixels(Horizontal)Edgeprofile(linear)10-90%rise=2.10pixels=1168perPHRGBrise=2.212.111.84pxlsRMSEdgeroughness=0.0845pxlsChartcontrast=10Gamma(fromchart)=0.743Lt,dklvls=217.3,39.3Lt/dk=5.53Imatest4.0.15ImageSensorEdgeprofile:Horizontal23-Nov-201417:23:463264x2448pixels(WxH)7.99MpxlsROI:169x294pixels22%abovectrY-channel(YA22)Gamma=0.50Edge-6.61degs00.20.40.60.8100.20.40.60.81Frequency,Cycles/pixelSFR(MTF)EvaluationversionPurchaseat=0.266Cy/Pxl=1304LW/PH(RGB)=0.2640.2660.277Cy/PxlMTF50P=0.266C/P=1304LW/PHUndersharpening24.6%MTF50=0.266Cy/PxlMTF20=0.421Cy/PxlMTFatNyquist=0.104NyquistfMTF:Horizontalw/NR+++ROI:169x294pixelsLRTB=15331701636929Edgeangle=-6.61degsEstm.chartcontrast=30.6SelectedEXIFdataModel:ISO:FL:Exp:Aper:Lens:IMG_2250.JPG-6-4-20246810Pixels(Horizo
本文标题:北京理工大学数码相机性能评测实验一视觉分辨率及空间频率响应(SFR)测试
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