Universally analyzed and discussed in this paper is the visualization of inhomogeneous phase distribution of phase objects with spatial zero frequency filtering and knifeedge filtering method.
Around the knifemethod 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。
3
A new technique was presented and proved by knife-edgemethod.