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Mexican Hat Edge Detect


PhilipLB

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Don't we have an edge detect already? Actually, stuff the rhetoric, we do. It's a default effect that comes with PdN. You can find it in the Stylize menu. Keep trying though - don't let me stop you! :mrgreen:

Lorenz_84_signature_by_PhillipsJ2.png

"I am the anarchist, I am the antichrist, I am the walrus, G'JOO G'GOO G'JOOB!"

I dig a pygmy, by Charles Hawtree and the Deaf Aids. Phase One, in which Doris gets her oats.

~John Lennon

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I don't know, how the default-one works. I think it goes in a specific angle with scanlines over the image and the result is the first derive of the pixels in this direction.

Mine goes in x- and y-direction with the second derive and combines the two results (Laplace-filter). First, it reduces the noise with a gaussian blurr.

-> Laplace-Kernel:

0 1 0

1 -4 1

0 1 0

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The difference:

The default one only detects angles in a certain direction. Mine detects all edges.

See on the image, how some edges aren't detected by the default-one.

The ui of mine is simple. Just a slider to controll the amount of noise-reduce.

First image: Really nice result with noise-reduce = 1 and then normalized (See viewtopic.php?f=16&t=23154 ). :D

13568_e519a87b46c0a9c23dea184f0d715e74

13568_0ee75a7a0a065276663615edf2a38857

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  • 3 weeks later...
You have to admit, no matter how similar the two are, PhilipLB's results much crisper lines. In my opinion.

Agreed, can we get this one to replace the default one?

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