This is my first post on this forum and there will be lots more in future 

 i`m a beginner in processing and working on a motion detector using my webcam.

i`ve done my research and gathered some codings through Google.

MY real problem is that when an object is detected, i`m not able to save it on my pc. there`s some kind of error occurring. (line 65)

if i comment this line, processing runs like a charm.

can someone please help me out with this please.

awaiting replies,
cheers

2. import processing.video.*;
3. // Variable for capture device
4. Capture video;
5. // Previous Frame
6. 
   
7. PImage prevFrame;
8. // How different must a pixel be to be a "motion" pixel
9. 
   
10. float threshold = 300;
11. 
    
12. void setup() {
13.   size(320,240);
14. 
    
15.    video = new Capture(this, width, height);
16.    video.start() ;
17.      
18.   // Create an empty image the same size as the video
19.   prevFrame = createImage(video.width,video.height,RGB);
20. 
    
21. }
22. 
    
23. void draw(){
24.   
25.   // Capture video
26.   if (video.available()) {
27.     // Save previous frame for motion detection!!
28.     prevFrame.copy(video,0,0,video.width,video.height,0,0,video.width,video.height); // Before we read the new frame, we always save the previous frame for comparison!
29.     prevFrame.updatePixels();
30.     video.read();
31.   }
32.   //initialsing time
33.   int sec = second(); // values from 0- 59
34.    int m = minute();  // Values from 0 - 59
35.   int h = hour();    // Values from 0 - 23
36.  int d = day();    // Values from 1 - 31
37.   int mo = month();  // Values from 1 - 12
38.   int year = year();   // 2003, 2004, 2005, etc.
39.   
40.   
41.   loadPixels();
42.   video.loadPixels();
43.   prevFrame.loadPixels();
44.   
45.   // Begin loop to walk through every pixel
46.   for (int x = 0; x < video.width; x ++ ) {
47.     for (int y = 0; y < video.height; y ++ ) {
48.       
49.       int loc = x + y*video.width;            // Step 1, what is the 1D pixel location
50.       color current = video.pixels[loc];      // Step 2, what is the current color
51.       color previous = prevFrame.pixels[loc]; // Step 3, what is the previous color
52.       
53.       // Step 4, compare colors (previous vs. current)
54.       float r1 = red(current); float g1 = green(current); float b1 = blue(current);
55.       float r2 = red(previous); float g2 = green(previous); float b2 = blue(previous);
56.       float diff = dist(r1,g1,b1,r2,g2,b2);
57.       
58.       pixels[loc]=video.pixels[loc]; 
59.      
60.       // Step 5, How we engage the detection part
61.       // If the color at that pixel has changed, then there is motion at that pixel.
62.       if (diff > threshold) { 
63.         // If motion, save frame
64.          println("Object detected at " +h+ "/" + m + "/" +sec+  "   "+ d+ "/"+ mo+ "/"+ year); // objected detected with time
65.         saveFrame("Object-######.jpg");  // Saves each frame as object-000000.jpg, object-000001.jpg, etc.   
66.           
67.     } else {
68.         continue;
69.       }
70.     }
71.   }
72. 
    
73.   updatePixels();
74. }