Page Comparison

import processing.video.*;
Capture video;
 
PImage backgroundImage;
float threshold = 20;
 
void setup() {
  size(640, 480);
  
  // start video captire
  video = new Capture(this, width, height, 30);
  video.start();
  
  // prepare image to save background
  backgroundImage = createImage(video.width, video.height, RGB);
}
 
void draw() {
  // read camera image if available
  if (video.available()) {
    video.read();
  }
  
   loadPixels();
  video.// active pixel manipulation of canvas
  loadPixels();
  
  // get pixel data from video and background image
  video.loadPixels();
  backgroundImage.loadPixels();
   
  // loop through video pixel by pixel
  for (int x=0; x < video.width; x++) {
    for (int y=0; y < video.height; y++) {
      int// loc get pixel array location
      int loc = x + y * video.width;
      
color fgColor = video.pixels[loc];   // get foreground color  (video)
      color bgColorfgColor = backgroundImagevideo.pixels[loc];
      
      // floatget r1background =color red(fgColorimage);
      floatcolor g1bgColor = green(fgColor);backgroundImage.pixels[loc];
       
      float// b1get = blue(fgColor);individual colors
      float r2r1 = red(bgColorfgColor);
      float g2g1 = green(bgColorfgColor);
      float b2b1 = blue(bgColorfgColor);
      float diffr2 = dist(r1, g1, b1, r2, g2, b2red(bgColor);
      float g2   = green(bgColor);
      float b2 = blue(bgColor);
      
      // calculate spacial distance between the two colors
      float dist = dist(r1, g1, b1, r2, g2, b2);
       
      // check if distance is above threshold
      if (diff > threshold) {dist > threshold) {
        // write foreground pixel
        pixels[loc] = fgColor;
      } else {
        // set pixel to black
        pixels[loc] = color(0); 
      }
    }
  }
 
  // write pixel back to canvas
  updatePixels();
}
 
void mousePressed() { 
  // copy current video frame into background image
  backgroundImage.copy(video, 0, 0, video.width, video.height, 0, 0, video.width, video.height);
  backgroundImage.updatePixels();
}