title: How to calculate and display a laplacian filtered image
body: <p>I would like to know how to calculate and display a laplacian filtered image for an example Laplacian filter like below..</p>
  
  <pre><code>-1    6   -1
   6  -20    6
  -1    6   -1
  </code></pre>
  
  <p>Please help me with this. Thank you. I appreciate any help I can get.</p>