# Revision history [back]

### Laplacian filter and parameters

I'm kind of new with opencv. I'm using Java and I'd like to know how to apply a Laplacian filter with alpha = 0.2, I mean, using this matrix to convolve:

0.1667    0.6667    0.1667
0.6667   -3.3333    0.6667
0.1667    0.6667    0.1667


I'm using this code, but I don't know what to use as "ddepth" and "ksize":

Imgproc.Laplacian(b, b_lapl, ddepth, ksize, 1, 0);

Is there any quick form of getting the abs of the result?

 2 retagged berak 32993 ●7 ●81 ●312

### Laplacian filter and parameters

I'm kind of new with opencv. I'm using Java and I'd like to know how to apply a Laplacian filter with alpha = 0.2, I mean, using this matrix to convolve:

0.1667    0.6667    0.1667
0.6667   -3.3333    0.6667
0.1667    0.6667    0.1667


I'm using this code, but I don't know what to use as "ddepth" and "ksize":

Imgproc.Laplacian(b, b_lapl, ddepth, ksize, 1, 0);

Is there any quick form of getting the abs of the result?