根据对比度及对比敏感度函数的定义,提出了一种基于积分球和特制调光器产生人眼对比敏感度测试目标的方法,搭建了人眼对比敏感度函数自动化测量系统。该系统采用交叉阶梯法进行心理物理学实验,可以实现人眼对比敏感度函数的测量,可测量的空间频率包括0.8,1.5,2.0,3.0,4.5,6.0,12.0和18.0周/(°),对比度测试目标背景亮度示值误差±5%,对比度重复性0.001,复现性0.004,均满足人眼对比敏感度函数的测量要求。
Abstract
According to the definition of contrast and contrast sensitivity function, a method of producing test targets for human eye contrast sensitivity measurement is proposed with integrating spheres and special light modulators. Then an automated measurement system is built and human eye contrast sensitivity function can be measured by psychophysical experiment with cross ladder method. Its spatial frequency covers 0.8, 1.5, 2.0, 3.0, 4.5, 6.0, 12.0 and 18.0 cycles per degree of visual angle. The indication error of background luminance of test targets satisfies ±5%, and contrast repeatability is 0.001 and reproducibility is 0.004, which meet requirements of human eye contrast sensitivity measurement.
关键词
计量学 /
对比敏感度函数 /
人眼视觉 /
对比度 /
积分球 /
心理物理学
Key words
metrology /
contrast sensitivity function /
human eye vision /
contrast /
integrating sphere /
psychophysics
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参考文献
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基金
“十二五”国家科技支撑计划(2011BAI02B06)
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