Skip to main content
Signal Processing

Return to Question

edited tags; edited title
Link
Royi
Royi
  • 20.5k
  • 4
  • 199
  • 240

Why are there two different common 3x3 kernelsAre There Two Different Common $ 3 \times 3 $ Kernels for the Laplacian?

Source Link
hippietrail
hippietrail
  • 151
  • 1
  • 9

Why are there two different common 3x3 kernels for the Laplacian?

I find both of these 3x3 Laplacian kernels to be commonly used:

 0 -1  0
-1  4 -1
 0 -1  0

and:

-1 -1 -1
-1  8 -1
-1 -1 -1

Is there a reason to choose one or the other? What's the difference between them?

(My math is not good enough to understand the Wikipedia article, so I can't figure it out myself from reading that. Googling is failing me for this one.)