Pokorny J, Jin Q, Smith V C
Visual Sciences Center, University of Chicago, Illinois 60637.
J Opt Soc Am A. 1993 Jun;10(6):1304-13. doi: 10.1364/josaa.10.001304.
We report data for three experiments that assess the effect on the luminosity function of chromatic adaptation arising from the measurement stimuli. First, we report spectral-sensitivity functions (wavelength range, 510-640 nm) measured by heterochromatic flicker photometry for a luminance range of 25-5000 Td. The data were fitted to a linear combination of cone fundamentals. The data narrowed and the fits deteriorated with an increase in luminance level, which indicates that at high luminances chromatic adaptation that is dependent on the spectral composition of the standard and test lights is a factor in spectral-luminosity determination. Second, we report heterochromatic modulation photometry as measured with two spectral lights at constant time-averaged chromaticity and luminance for luminances from 1.6 to 1300 Td. For a time-averaged chromaticity of 570 nm, the red-green ratio of the photometric match was invariant with luminance. For a time-averaged chromaticity of 605 nm, the red-green ratio increased by almost 0.3 log unit for a 2-log-unit increase in luminance, which is indicative of chromatic adaptation to the 605-nm chromaticity. Third, we measured flicker increment detection (wavelength range, 510-640 nm) on 570- and 605-nm backgrounds of 25-5000 Td. The data were fitted to a linear combination of cone fundamentals and showed good fits at all luminances. Fits to the 570-nm-background data set showed little variation in the proportions of the cone fundamentals with luminance. Fits to the 605-nm-background data set required an increased weighting of the middle-wavelength-sensitive cone with luminance. These three experiments indicate that luminance-dependent variation in the spectral-luminosity function as assessed by flicker techniques is caused primarily by chromatic adaptation to the measurement stimuli.
我们报告了三项实验的数据，这些实验评估了测量刺激引起的色适应对光度函数的影响。首先，我们报告了通过异色闪烁光度法在25 - 5000Td的亮度范围内测量的光谱灵敏度函数（波长范围为510 - 640nm）。数据拟合为视锥细胞基本函数的线性组合。随着亮度水平的增加，数据变窄且拟合变差，这表明在高亮度下，依赖于标准光和测试光光谱组成的色适应是光谱光度测定中的一个因素。其次，我们报告了在1.6至1300Td的亮度下，用两种光谱光在恒定时间平均色度和亮度下测量的异色调制光度法。对于时间平均色度为570nm，光度匹配的红绿比与亮度无关。对于时间平均色度为605nm，亮度增加2个对数单位时，红绿比增加了近0.3个对数单位，这表明对605nm色度的色适应。第三，我们在25 - 5000Td的570nm和605nm背景上测量了闪烁增量检测（波长范围为510 - 640nm）。数据拟合为视锥细胞基本函数的线性组合，并且在所有亮度下都显示出良好的拟合。对570nm背景数据集的拟合显示视锥细胞基本函数的比例随亮度变化很小。对605nm背景数据集的拟合需要随着亮度增加对中波长敏感视锥细胞进行加权。这三项实验表明，通过闪烁技术评估的光谱光度函数中与亮度相关的变化主要是由对测量刺激的色适应引起的。
