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Wavelength-dependent spatial correction and spectral calibration of a liquid crystal tunable filter imaging system

机译：液晶可调滤光片成像系统的波长相关空间校正和光谱校准

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摘要

The centroid wavelength of liquid crystal tunable filters (LCTFs), by definition, changes with incident angle, resulting in an imaging system with spectral sensitivity that varies across the image plane. Prior to this research, this effect was considered negligible. Imaging uniform colored papers with high chroma revealed that the effect is appreciable. A regression-based method of modeling and correcting systematic spectrophotometric errors in conventional reflectance spectrophotometry was used to correct this wavelength-dependent spatial nonuniformity in an LCTF imaging system. For six high chroma sheets of spatially uniform paper, the uniformity was reduced from an average and maximum of 0.95 and 4.00, respectively, to 0.08 and 0.18 CIEDE2000. The same method was used to transfer the scale of spectral reflectance factor from a reference spectrophotometer to the imaging system such that its reported values matched the reference spectrophotometer with a constant bandwidth. For an independent color target, residual errors were 0.008 spectral reflectance factor RMS difference and 0.44 and 1.65 average and maximum CIEDE2000, respectively (0.63 and 2.34 Delta E-ab*). (C) 2015 Optical Society of America
机译：根据定义，液晶可调滤光片（LCTF）的质心波长会随入射角而变化，从而导致成像系统的光谱灵敏度在整个像平面上变化。在进行这项研究之前，这种影响被认为可以忽略不计。对具有较高色度的均匀彩色纸进行成像显示，效果可观。在传统的反射分光光度法中，基于回归的建模和校正系统分光光度误差的方法用于校正LCTF成像系统中这种与波长相关的空间不均匀性。对于六张高色度的空间均匀纸，均匀性从CIEDE2000的平均值和最大值分别从0.95和4.00降低到0.08和0.18。使用相同的方法将光谱反射系数的标度从参考分光光度计转移到成像系统，以使其报告的值与参考分光光度计匹配，且带宽恒定。对于独立的彩色目标，残留误差分别为0.008光谱反射系数RMS差和0.44和1.65的平均和最大CIEDE2000（Delta E-ab *）（0.63和2.34 Delta E-ab *）。 （C）2015年美国眼镜学会

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