Does anyone know what a 3x3x3 Laplacian kernel looks like? I realize that might be an open-ended question, but I need to apply a Laplacian convolution using a 3x3x3 Laplacian kernel, and frankly I don't know what it looks like...


**edit:** and by what it "looks like" I'm hoping someone can just tell me in the form of



```
1 1 1
2 2 2
3 3 3

4 4 4 
5 5 5 
6 6 6

7 7 7
8 8 8 
9 9 9

```

etc.



3x3x3 Laplace Kernel?
I think (perhaps?) you are looking for the [discrete Laplacian operator](https://en.wikipedia.org/wiki/Discrete_Laplace_operator). That Wikipedia page lists the $3 \times 3 \times 3$ convolution kernels explicitly.


