不同运动速度下人眼的阈上调制特性

THE SUPRATHRESHOLD CONTRAST MODULATION CHARACTERISTICS OF THE HUMAN VISUAL SYSTEM AT VARIOUS CONSTANT VELOCITIES

本文报道了在光栅的三种恒定运动速度(0°/S,10°/S,30°/S)下,阈值对比敏感度函数CSF(V)和阈上对比度比配函数CMF(V,C)的测试数据.计算机拟合结果表明,在各个不同的恒定运动速度下,人眼的阈上对比度比配函数CMF(V,C)和阈值对比敏感度函数CSF(V),可以由静止目标的阈值对比敏感函数CSF近似地预测出来.本文给出了预测方法的数学描述及有关经验公式.

In this paper measurements of threshold contrast sensitivity functions CSF(v) and suprathreshold contrast matching functions CMF(v,c) were made at three constant velocities (0 deg./s, 10 deg./s, and 30 deg./s) and contrast levels (threshold contrasts and two suprathreshold contrast levels) of the observed gratings. The results of computer fitting indicate that the suprathreshold contrast matching function CMF(v, c) and contrast sensitivity function CSF(v) at various constant velocities could be approximately predicted from CSF (i.e. contrast sensitivity function) measured data or any CSF curve fitting functions.The mathematical description of the prediction and the related empirical formula are presented.