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Subjective Impression of Discomfort Glare from Sources of Non-Uniform Luminance

机译：非均匀亮度源对不适眩光的主观印象

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A paired comparison experiment was performed to study theneffects of spatial frequency and position on discomfort glare. Thenexperiment required the subject to choose which of two stimuli, whennpresented together, caused more discomfort (termed the “choice” data),nand then also rate how much more discomforting the one is than thenother (termed the “magnitude” data). A rating scale experiment wasnalso performed.nSignificant Findings:n1. The results show that both position and spatial frequency arensignificant predictors of discomfort. As position increases above the linenof sight, glare decreases. As spatial frequency increases, discomfortnincreases, with a uniform stimulus causing the most discomfort (wheren“uniform” is defined here as infinite cycles per degree).n2. The results show that the effect of spatial frequency is morenpronounced at positions closer to the line of sight.n3. The findings here contradict the CIE’s complex extension to thenUnified Glare Rating (UGR). The CIE complex extension clearly statesnthat a complex source will always predict more glare than the uniformnone, which is in direct opposition to the results found in the pairedncomparison experiment discussed here.n4. A relationship between contrast sensitivity and discomfortnsensitivity was found. Contrast sensitivity peaks at a particularnfrequency, and it drops on either side of that peak frequency (at anyngiven eccentricity). That peak frequency decreases as eccentricitynincreases (Fig. 1). This research shows that discomfort is minimized atna particular frequency, and it increases on either side of that minimumnfrequency (at any given position), which is contrary to the effect ofncontrast sensitivity.n5. For each position, the lowest glare perception occurred for the frequency which has approximately 3 receptive fields per cycle (see Fig.n23 through Fig. 26).n6. The paired comparison technique gave data with much lessnvariability than the rating scale technique, as can be seen from the sizenof the error bars in Fig. 9 and Fig. 16. It is the recommendation of thenauthors that researchers consider using a paired comparisonnexperimental technique for glare research in the future.
机译：进行配对比较实验以研究空间频率和位置对不适感眩光的影响。然后，实验要求受试者选择两种刺激中的哪一种在一起出现时会引起更多不适感（称为“选择”数据），然后还评估一种刺激比其他刺激引起的不适（称为“幅度”数据）多得多。还进行了定级量表实验。n重要发现：n1。结果表明，位置和空间频率均是不适感的重要预测指标。当位置增加到视线上方时，眩光会减少。随着空间频率的增加，不适感会增加，均匀的刺激会引起最大的不适感（此处“均匀”定义为每度无限循环）。结果表明，在更靠近视线的位置上，空间频率的影响更为明显。此处的发现与CIE对当时的统一眩光等级（UGR）的复杂扩展相矛盾。 CIE复杂扩展清楚地表明，复杂源总是比统一声源预测更多的眩光，这与此处讨论的配对比较实验中发现的结果直接相反。发现对比敏感度和不适敏感度之间的关系。对比度灵敏度在特定频率处达到峰值，并在该峰值频率的任一侧下降（在任何偏心率时）。峰值频率随着离心率的增加而降低（图1）。这项研究表明，不适感在特定频率下被最小化，并且在该最低频率的任一侧（在任何给定位置）都增加了不适感，这与n对比敏感度的影响相反。对于每个位置，对于每个周期大约有3个接收场的频率，发生最低的眩光感（见图n23至图26）。从图9和图16中误差条的大小可以看出，配对比较技术所提供的数据的可变性比等级标度技术小得多。这是作者建议研究人员考虑使用配对比较实验技术进行眩光处理的建议。未来的研究。

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