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目的建立一定对比的视标在人眼光亮度有效感知区和眩光影响下的有效对比度的曲线方程。方法假定人眼有生理光亮度有效感知区,用极限值(明阈值与暗阈值)来量化表示,结合眩光变量,在迈克逊的对比度公式基础上,分析各种条件下的适用曲线方程,进行一般二次曲线的不变量判别和计算后,建立分段曲线方程组。结果 6个分段曲线方程构成两幅无缝接壤曲线图,3种条件下呈一直线,另3个条件下都是双曲线。结论眩光变量与有效对比度关系曲线方程组可用于计算多因素影响下的视标有效对比度,再通过与相同背景适应光下测定的对比敏感函数对照就可以知道相应的有效视力。
OBJECTIVE To establish a curve equation of effective contrast under the influence of the effective perceived area of eye brightness and the glare of a certain contrast target. The method assumes that the human eye has an effective perception zone of physiological light, quantified by the limit values (the threshold and the dark threshold), and the applicable curve equation under various conditions is analyzed on the basis of the contrast formula of the formula by using the glare variable General constitutive curve of the invariant identification and calculation, the establishment of piecewise curve equations. Results The six piecewise curve equations formed two seamless boundary curves, which were linear under the three conditions and hyperbolas under the other three conditions. Conclusion The equations of the relationship between glare variables and effective contrast can be used to calculate the effective contrast of the target under the influence of multiple factors. Then the corresponding effective visual acuity can be known by comparing with the contrast sensitivity function determined by the same background adaptive light.