在所有的情况下，滤波运算都是使用方形窗或圆环来进行的。
In all cases, filtering operations are carried out using a square window or annulus.
炸圈饼面团一种未发涨的油炸面团圈，通常成纽绞条状，但也有圆环或长方形的。
An un raised doughnut usually twisted but also shaped into rings or oblongs.
安妮：会旗的样子是不是这样的，长方形，白色无边，中央有五个相互套连的圆环，环的颜色是——看！
Annie: the flag is rectangle. It is white without edges, isn't it? It has five-overlapping rings in the middle. The color of the rings is... Look!
应用推荐