I am trying to create a small game for kids about exploiting bubbles with the "touch" of their fingers. I have seen some examples in the web about exploiting bubbles, some with OpenCv and others with GSVideo, but as I need finger tracking I am trying to use the JavaCVPro library, which suggest to use GSVideo for the video capture part and opencv/javacvpro functions for the video processing part.

I am still at the very begining of the game trying to capture any movement. I have correctly done everything with opencv but when I try to use GSVideo for the capture part it gives me the error "Null Pointer Exception", I have checked my code and don´t find the problem, could you please help?

Here it is my code:

2. import hypermedia.video.*;  
3. import codeanticode.gsvideo.*;
4. 
   
5. OpenCV opencv;                    
6. GSCapture cam;
7. PImage imgSrc;
8. 
   
9. void setup()
10. { 
11.   size( 800, 600 );
12.  
13.   //OpenCV
14.   opencv = new OpenCV( this );    
15.   //opencv.capture( width,height);       
16.   
17.   //GSVideo
18.   cam=new GSCapture(this,width,height);
19.   cam.start(); 
20. }
21.  
22. void draw()
23. {
24.   //GSVideo
25.   cam.read();
26.   imgSrc=cam.get();
27.   opencv.copy(imgSrc);
28.   
29.   //OpenCV 
30.   //opencv.read();                  
31.   
32.   //OpenCV or GSVideo
33.   opencv.absDiff();               
34.   opencv.convert(OpenCV.GRAY);
35.   opencv.threshold(20);
36.   image(opencv.image(), 0, 0 );  
37.   opencv.remember();             
38. }

Thanks in advance and brgds,