Some filters only as a convenience for you to remember [only] exam

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This link: https://blog.csdn.net/weixin_42859280/article/details/93852580

I'll write it down like this:

waist matrix here:
if the middle value with little difference on both sides. Is low pass. To, (gentle) blurred image

if the intermediate value on both sides with a relatively large difference. Is Qualcomm. For, to sharpen the image

0 where it occurs on both sides of the waist, is the Laplacian edge extraction filter.