Fleck H J
Bavariaring 4, München, Federal Republic of Germany.
Biol Cybern. 1989;61(6):437-46. doi: 10.1007/BF02414905.
This report describes experimental measurements of threshold contrasts as a function of the angle to the visual axis (peripheral threshold contrasts). The visual tasks consist in detection (perception of presence) and discrimination (perception of a form feature) of simple visual signs during a fixation period realistic observing conditions being chosen. Proceeding from the experimental findings a model for forecasting off-axis threshold contrast functions on different visual conditions is developed based upon spatial frequency filters. Further with the aid of a known model visibility fields are calculated.
本报告描述了作为与视轴夹角函数的阈值对比度的实验测量结果（周边阈值对比度）。视觉任务包括在选择了逼真观察条件的注视期内对简单视觉标志的检测（感知存在）和辨别（感知形状特征）。基于实验结果，基于空间频率滤波器开发了一个用于预测不同视觉条件下离轴阈值对比度函数的模型。此外，借助一个已知模型计算了可见度场。
