hi,

actually this is a library you can use in processing.
just gave it a try and it worked.
here are the instructions:

download the library here: http://www.jhlabs.com/ip/filters/download.html

place the file  Filters.jar here:

"your-sketchbook-location"/libraries/Filters/library/Filters.jar

and after that, run the following code-snippet

1. import java.awt.image.BufferedImage;
2. import com.jhlabs.image.GaussianFilter;
3. 
   
4. PImage p5_img_src;
5. PImage p5_img_dst;
6. 
   
7. public void setup() {
8.   p5_img_src = loadImage("http://processing.org/img/shirts/toxi-1.jpg");
9. 
   
10.   size(p5_img_src.width, p5_img_src.height);
11. 
    
12.   BufferedImage j_buff_img_src = (BufferedImage) p5_img_src.getImage();
13.   GaussianFilter gaussian = new GaussianFilter(12);
14.   BufferedImage j_buff_img_dst = gaussian.filter(j_buff_img_src, null);
15.   p5_img_dst = new PImage(j_buff_img_dst);
16. }
17. 
    
18. public void draw() {
19.   if ( mousePressed ) {
20.     image(p5_img_src, 0, 0);
21.   }
22.   else {
23.     image(p5_img_dst, 0, 0);
24.   }
25. }