Laplacian filter

Hi,

i need help programming a 2D laplacian filter filter using a D x y 2 = [ 0 1 0 1 − 4 1 0 1 0 ] {\displaystyle \mathbf {D} _{xy}^{2}={\begin{bmatrix}0&1&0\\1&-4&1\\0&1&0\end{bmatrix}}}

matrix.

The program should load a picture via READBMP then apply the filter and output the edited picture.

It would be really cool if you could also comment your program since i have no experience using Mathcad at all.

Thank you very much

JensE