Fitzgerrell A R, Dowski E R, Cathey W T
Appl Opt. 1997 Aug 10;36(23):5796-804. doi: 10.1364/ao.36.005796.
We present a two-dimensional function that graphically illustrates the effects of defocus on the optical transfer function (OTF) associated with a circularly symmetric pupil function. We call it the defocus transfer function (DTF). The function is similar in application to the ambiguity function, which can be used to display the OTF associated with a defocused rectangularly separable pupil function. The properties of the DTF make it useful for analyzing optical systems with circularly symmetric pupils when one is interested in the OTF as a function of defocus. In addition to presenting these properties, we give examples of the DTF for systems with clear, bifocal, and annular pupil functions.
我们提出了一个二维函数，该函数以图形方式说明了离焦对与圆对称光瞳函数相关的光学传递函数（OTF）的影响。我们将其称为离焦传递函数（DTF）。该函数在应用方面类似于模糊函数，模糊函数可用于显示与离焦的矩形可分离光瞳函数相关的OTF。当人们对作为离焦函数的OTF感兴趣时，DTF的特性使其可用于分析具有圆对称光瞳的光学系统。除了介绍这些特性外，我们还给出了具有清晰、双焦和环形光瞳函数的系统的DTF示例。
