【摘要】 在最小可分辨对比度MRC测试中,提出了一种实现测试靶标可调对比度的新方法。这种方法是将测试靶标放在两个重叠积分球中间,在两个积分球紧邻靶面处各开有一圆形孔,用以照明测试靶标的正反两面。在每个积分球入口处安放衰减片,转动衰减片可以控制进入积分球的光通量,从而改变了测试靶标正反两面的亮度,实现了测试靶标对比度的可调。基于此方法研制了靶标发生器,可用于快速检测可见光成像系统的MRC。测试实验结果表明,该发生器亮度可在0.3~200cd/m2范围内重复调节,测量亮度误差在±0.3cd/m2以内。更多还原

【Abstract】 For the measurement of a Minimum Resolvable Contrast(MRC),a novel method for realizing the adjustable contrast of a test target is proposed.The target is inserted between two coinciding integrating spheres.On each side of the integrating spheres the rounded holes are opened so that two integrating spheres can illuminate the front and back of the target respectively.The attenuators are placed at each entrance of integrating spheres.Each luminous flux falling onto the spheres can be regulated by tuning the attenuators separately.Therefore the luminance of two sides of the target is changed and the adjustable contrast of the target is realized.Based on this technique the target generator is developed.It can be used to measure the MRC of a visible imaging system rapidly.Experimental results indicate that the luminance of the generator can be adjusted from 0.3 to 200cd/m2 repeatedly;the error of measuring the luminance can be controlled within ±0.3cd/m2更多还原