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.

youdao

现在很明显，我不能使用方形点击区域，因为我会有重叠的点击区域。

Now it's pretty obvious that I can't use square click areas for that because I'd have overlapping click areas.

youdao

从本质上说，使用非方形像素解析720x480，使用方形像素解析640x480。

Essentially, it explains 720x480 using non-square pixels and 640x480 using square pixels.

youdao