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Estimating the legibility of a single letter E viewed at different display angles

机译:估计在不同显示角度观看的单个字母E的可读性

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摘要

Text is often viewed not perpendicularly to its display. With nine assumptions, this study developed a new equation for estimating the legibility of a single letter E viewed at different display angles. This equation examines viewing distance, text height, strokewidth, Snellen acuity, background luminance, luminance contrast, and incident angle. This equation was derived from the existing Howett's equation based on a constant-solid-angle hypothesis tested in a lighting laboratory by reading letter 'E's using 20 young human subjects. The hypothesis holds when the incident angle 0° ≤ ξ ≤ 65.7°, but fails when 65.7° < ξ ≤ 82.8° (the maximum angle tested). Another ambient-light hypothesis was also tested in the same laboratory using 20 young subjects to verify the negligible influence (less than 9%) of ambient light on legibility of text. The new equation was accordingly improved to help ergonomists and other professionals create and maintain legible displays.
机译:文本通常不垂直于显示而查看。通过九个假设,本研究开发了一个新的方程式,用于估计在不同显示角度观看的单个字母E的可读性。此公式检查查看距离,文本高度,笔划宽度,Snellen敏锐度,背景亮度,亮度对比度和入射角。该方程式是根据现有的Howett方程式得出的,该方程式基于在照明实验室中通过使用20个年轻人的字母'E'进行了测试而测试的恒定立体角假设。假设在入射角0°≤ξ≤65.7°时成立,但在65.7°<ξ≤82.8°(测试的最大角度)时失效。在同一实验室中,还使用20名年轻受试者测试了另一种环境光假设,以验证环境光对文本清晰度的影响可以忽略不计(不到9%)。相应地改进了新的公式,以帮助人体工程学专家和其他专业人员创建和维护清晰的显示。

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