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一、前言早在五十年代H.H.Hopkins和主之江都导出波差方差近似计算O.T.F的公式,用于象质评价。王之江据此还提出了低对比分辨本领的方差,为传递函数与几何象差的关系讨论提供了一条简便的途径。但是像质评价中低对比分辨本领方法使用起来困难较多,尤其是计算O.T.F时,只有大量计算不同频率的O.T.F值,才能比较准确地找到MTF=0.5(0.3)所对应的特殊频率,这就限制了该法在光学设计中的应用。
I. Preface Earlier in the fifties H.H. Hopkins and Lord Jiang both derived the wave difference variance approximation formula for calculating O.T.F for the evaluation of the image quality. Based on this, Wang Zhijiang also proposed the variance of low contrast resolution, which provides a convenient way to discuss the relationship between transfer function and geometric aberration. However, it is more difficult to use the methods of low resolution and contrast in image quality evaluation. Especially when OTF is calculated, only a large number of OTF values of different frequencies can be calculated, so that the special frequency corresponding to MTF = 0.5 (0.3) can be found accurately. Limit the application of this method in optical design.