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1、数码相机测评 实验三 畸变及均匀性1 红米 1S 相机畸变测试偏移数值为-1.88% 畸变是衡量数码相机整体性能的一个重要指标。表征了数码相机在实际拍摄后物和像几 何尺寸的变形程度。畸变不影响像的清晰度。数码相机镜头的畸变是给数码相机拍摄带来畸 变的主要因素。在数码相机国家标准中对畸变有定量的要求，要求数码相机的相对畸变在5 范围内。红米 1S 相机畸变方面符合国家标准，但-1.88%的偏移值仍不尽人意。File白日讣铁耳酸哽.|日厨Co rr&cted image: Be&l cf above 15- D&c -201S 22:23:04m m&K p ortl 449061662B3 O.
2、ip qSMI A TV Distarticn = fiR% Barrelk = 0.32 (r = r k/(r in ctr-corner units.)h- D OeSfi, -0.D42Arctan/tan Cceff. = 0.03025Arctan,fen Sate * 0.989Li CSlC Aretenrtan BES7I. 处v tmatest2 均匀性测试Figure 1: Luminance contoursFile旨|忍纵辎凰|日匡ISelected EXIF dataMax = 0.5S4 relative to 1 for pixel 255 32x32 pxls
3、 areas Corners: worst = 0.464 (76.1%: mean = 0.513Sides: 0.535 (90% 0.547 (92.1%; mean = 9t% (luminance contours mmexport14490G1656S97jpgLRTB= 0.5350.5470.5610.517UL LL UR LR = 0.6040硼 Q.4&50.钏0 imatest4.2.415-Dcc-2015 22:26:21结果：Max = 0.594Corners : worst = 0.464(78.1%);mean = 0.513(86.3%)Sides : 0
4、.535(90%) 0.547(92.1%); mean = 91%L R TB = 0.535 0.547 0.561 0.517UL LL UR LR = 0.604 0.488 0.495 0.464FileII643a dCD勒 Figure 2: F-stop (EV) contours f-皿&-1.655LRTB= -0.3 -0.235.1 嗣 -0.401ULLL UR LR = 0.0503 -A).563 -05凸 XJ.711回Selected EXIF date4.2.415-DCC-2015 22:26:21-1.579S imatestF-stop (EV) co
5、ntours (luminance mmexport1449061656597.jpgGamma - 0.5 32x32 pxls areasCornerstrel: worst = -0.711; mean = -0.437 (f-stops.Sides: -0.3 -0.235; rnean = -0.268Gamma = 0.5Cornerts : worst = -0.711; mean = -0.437Sides: -0.3 -0.235; mean = -0.268L R T B = -0.3 -.0.235 -0.164 -0.401UL LL UR LR = 0.0503 -0.563 -0.524 -0.711
