I don't really follow how they came up with the derivative equation. Could somebody please explain in some details or even a link to somewhere with sufficient math explanation? Laplacian filter ...

Background Here's a video of a song clip from an electronic song. At the beginning of the video, the song plays at full speed. When you slow down the song you can hear all the unique sounds that th...

I would like to know how to calculate a Laplacian mask of an arbitrary odd size kernel (2nd derivative). For example, I know a 3x3 would be: 1 1 1 1 -8 1 1 1 1 And a 5x5 mask would be: ...

This is a formula for LoG filtering: (source: ed.ac.uk) Also in applications with LoG filtering I see that function is called with only one parameter: sigma(σ). I want to try LoG filtering using...