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。

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Around the knife method are many, and each has a different, but is the first knife bevel, either until the edge rolling up, and in turn the back ground.

磨刀方法很多，各人各地都有不同，但无论哪种都是先磨刀的斜面，直至刃口卷起，再反过来磨背面。

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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。

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