1. import processing.video.*;
   // Variable for capture device
   Capture video;
   // Previous Frame
   PImage prevFrame;
   // How different must a pixel be to be a "motion" pixel
   float threshold = 120;
   
   void setup() {
     size(640,480);
     video = new Capture(this, width, height, 30);
     // Create an empty image the same size as the video
     prevFrame = createImage(video.width,video.height,RGB);
    
    
   }
   
   void draw() {
    
     // Capture video
     if (video.available()) {
       // Save previous frame for motion detection!!
       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!
       prevFrame.updatePixels();
       video.read();
         
     }
   
     loadPixels();
     video.loadPixels();
     prevFrame.loadPixels();
    
    
    
     // Begin loop to walk through every pixel
     for (int x = 0; x < video.width; x ++ ) {
       for (int y = 0; y < video.height; y ++ ) {
        
         int loc = x + y*video.width;            // Step 1, what is the 1D pixel location
         color current = video.pixels[loc];      // Step 2, what is the current color
         color previous = prevFrame.pixels[loc]; // Step 3, what is the previous color
        
         // Step 4, compare colors (previous vs. current)
         float r1 = red(current); float g1 = green(current); float b1 = blue(current);
         float r2 = red(previous); float g2 = green(previous); float b2 = blue(previous);
         float diff = dist(r1,g1,b1,r2,g2,b2);
        
        
         // Step 5, How different are the colors?
         // If the color at that pixel has changed, then there is motion at that pixel.
         if (diff > threshold) {
           // If motion, display black
           pixels[loc] = color(0);
         } else {
           // If not, display white
           pixels[loc] = color(255);
          
         }
       
       }
     }
     updatePixels();
   
   }

This is Daniel Shiffman's code. What i'm trying is - when camera detects motion, program has to take an image and keep saving images as long as it detects motion (motion is "detected" when there is a change in pixels color - you can see in code), but every image has to be standalone file.
I tried with

1. video.save("motion.jpg")

but it's isn't stable at all. After few seconds, processing sends error : "error saving image" - probably because it's saving
one image over other, but it can't do it so fast.
So, i tried with

1. video.save(millis() + ".jpg."),

thinking, maybe i can solve image writing error on that way, and it works (without errors), but then it's taking images all the time, not only when camera detector is triggered.

Command

1. saveFrame()

won't work with "video." as a prefix, - but, without that only black/white pixels can be saved.

Any idea/hint?
(I hope that you can understand me )

Processing version - 1.2.1
Windows 7 Pro 32-bit

Thanks, finished .

Eventually, video.save(millis()+".jpg")  is more than enough. Bigger problem was how to avoid continiuously image saving even there is no motion. I solved it with if (/else) statement. Works like a charm

Greetings to all