Universally analyzed and discussed in this paper is the visualization of inhomogeneous phase distribution of phase objects with spatial zero frequency filtering and knife edge filtering method.
对空间滤波法的零频滤波与刀口滤波显示位相型物体的非均匀位相分布进行较为普遍且详尽的分析讨论，并给出一些实验结果。
A new technique was presented and proved by knife-edge method.
在传统的刃边法基础上，介绍并验证了一种新的点靶标方法。
So far people have put forward some basic methods for evaluate the MTF values of the lens, such as knife-edge method, laser speckle method and extended frequency aperture (EFA) method.
迄今为止，人们已经提出了诸如刃边法、激光散斑法、扩展频率孔径法等多种测量离散成像器件MTF的方法。
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