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实验使用电子计算机控制彩色图象显示器的屏幕来呈现视觉目标彩色光栅,以对人的颜色视觉进行对比感受性的测定。被试可以通过终端键盘改变光栅的各种变量并进行反应,计算机对结果进行记录和处理。实验Ⅰ是对比感受性作为红-绿光栅和绿色单色光栅的空间频率的函数的测定。结果表明,在所有空间频率上,被试对绿色光栅的对比感受性都比对红-绿光栅要高。但随着空间频率的升高,对两种光栅的对比感受性也相应升高,并都在中间空间频率带达到高峰值。实验Ⅱ是对颜色视觉对比感受性作为红-绿亮度比率的函数的测定。结果表明,空间频率和红色在光栅中的比率对对比感受性都有重要的影响。本实验结果具有明显的实际应用价值。
Experiments use a computer controlled color image display screen to present a visual target color raster to determine contrasting human color vision. Subjects can change the various variables of the grating through the terminal keyboard and react, and the computer records and processes the results. Experiment I is a measure of the contrast sensitivity as a function of the spatial frequency of the red-green and green monochromatic gratings. The results show that the subjects are more sensitive to green gratings than red-green gratings at all spatial frequencies. However, with the increase of spatial frequency, the contrast sensitivity of the two gratings also increased correspondingly, and all reached the peak value in the intermediate space frequency band. Experiment II is a measure of the perceived color contrast as a function of the ratio of red to green brightness. The results show that the ratio of the spatial frequency and the red color in the grating has an important influence on the contrast sensitivity. The experimental results have obvious practical value.