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A Test of the S/P Ratio as a Correlate for Brightness Perception using Rapid-Sequential and Side-by-Side Experimental Protocols

机译：使用快速顺序和并行实验协议测试S / P比与亮度感知的相关性

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摘要

An experiment was performed to: 1) Test the hypothesis thatnthe ratio P*(S/P)0.5 can be used to predict the perception of spatialnbrightness, and 2) directly compare the rapid-sequential and side-bysidenevaluation modes for assessing spatial brightness. The twonevaluation modes produced comparable results. Though the side-bysidenmethod has in the past been questioned by others, the data hereinnillustrates that it is neither faulty nor invalid. Red, green, and bluenLEDs were employed to create four light settings that werenpermutations of two S/P ratios (1.7 and 2.6) and two luminance levelsn(24 and 30 cd/m2). The S/P ratios corresponded to the practicalnextremities of CCT (2900 and 7200 K) and were structured to haventheir chromaticity on the blackbody locus. At equal luminance therenwas no difference in the perception of brightness, irrespective of CCT.nAt unequal luminance, but when the ratio of P*(S/P)0.5 was set to 1:1,nbrightness perception was predicted by luminance. These data suggestnthat spatial brightness perceptions at photopic light levels are unrelatednto the S/P ratio of the illumination. These results are consistent withnthe “prime color” theory of vision that is rooted in the trichromaticnnature of human vision.
机译：进行了以下实验：1）测试以下假设：比率P *（S / P）0.5可用于预测空间亮度的感知，以及2）直接比较快速顺序和并排评估模式以评估空间亮度。两种评估模式产生了可比的结果。尽管并排方法在过去一直受到其他人的质疑，但本文中的数据说明该方法既无缺陷也不无效。使用红色，绿色和蓝色LED来创建四个光设置，它们是两个S / P比（1.7和2.6）和两个亮度水平n（24和30 cd / m2）的排列。 S / P比值对应于CCT的实际极限值（2900和7200 K），并被构造为在黑体轨迹上具有其色度。在相同的亮度下，与CCT无关，它们对亮度的感觉没有差异。n在不相等的亮度下，但是当P *（S / P）0.5的比率设置为1：1时，可以通过亮度预测n亮度。这些数据表明，在明视水平上的空间亮度感知与照明的S / P比无关。这些结果与植根于人类视觉三色性的“原色”视觉理论相一致。

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