Hi all!
I'm a newbie on Processing and i'm trying to do this thing:
i've open the example call"Brightness Tracking", it  tracks the brightest pixel on the screen.

This is the code:

import processing.video.*;

Capture video;

void setup() {
 size(640, 480); // Change size to 320 x 240 if too slow at 640 x 480
 // Uses the default video input, see the reference if this causes an error
 video = new Capture(this, width, height, 30);
 noStroke();
 smooth();
}

void draw() {
 if (video.available()) {
   video.read();
   image(video, 0, 0, width, height); // Draw the webcam video onto the screen
   int brightestX = 0; // X-coordinate of the brightest video pixel
   int brightestY = 0; // Y-coordinate of the brightest video pixel
   float brightestValue = 0; // Brightness of the brightest video pixel
   // Search for the brightest pixel: For each row of pixels in the video image and
   // for each pixel in the yth row, compute each pixel's index in the video
   video.loadPixels();
   int index = 0;
   for (int y = 0; y < video.height; y++) {
     for (int x = 0; x < video.width; x++) {
       // Get the color stored in the pixel
       int pixelValue = video.pixels[index];
       // Determine the brightness of the pixel
       float pixelBrightness = brightness(pixelValue);
       // If that value is brighter than any previous, then store the
       // brightness of that pixel, as well as its (x,y) location
       if (pixelBrightness > brightestValue) {
         brightestValue = pixelBrightness;
         brightestY = y;
         brightestX = x;
       }
       index++;
     }
   }
   // Draw a large, yellow circle at the brightest pixel
   fill(255, 204, 0, 128);
   ellipse(brightestX, brightestY, 200, 200);
 }
}

If i want to track 2 points, what is the way to follow?
Trying to use 2d arrays?


Cheers
Gio!

Thanks a lot! I try to do this!

no bother

just google for computer vision source code. plenty of scientific papers available from open research groups involved in robotics and university teaching around, most of them usually have some tutorial example code about these computer vision basics.

also opencv sourcecode might be worth a look
http://opencv.willowgarage.com/wiki/