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这篇文章提供了以刀口象分析为基础的测量OTFs新方法。到现在为止,所用的对刀口象微分继之以付立叶变换的求OTF评价的方法,对扫描的刀口象强度分布进行微分,不论是用数字的或实验的方法都是复杂的过程。因此,接着进行的付立叶变换数据含有误差。本文叙述一个避免求导的方法。而且,在付立叶变换中采用了Walsh函数,得出一个令人满意的和实际上有用的改进,在其中有效地使用了扫描器所需要的有限尺寸,使整个装置简单和足够精确。初步结果和有关的照相底片可以说明这个方法。
This article provides a new method of measuring OTFs based on edge-to-edge analysis. Until now, the method used to differentiate the knife edge as followed by the Fourier transform for OTF evaluation has been used to differentiate the intensity distribution of the knife edge of the scan, both in a numerical and experimental manner. Therefore, the Fourier transform data that follows is an error. This article describes a method to avoid derivation. Moreover, Walsh functions are used in the Fourier transform, resulting in a satisfactory and practically useful improvement in which the limited size required by the scanner is effectively used, making the entire device simple and precise enough. The preliminary results and related photographic negatives illustrate this approach.