import processing.video.*;
Capture myCapture;
PImage lastCapture, curCapture;

void setup() 
{
  size(200, 200);

  // The name of the capture device is dependent those
  // plugged into the computer. To get a list of the 
  // choices, uncomment the following line 
  //println(Capture.list());
  // And to specify the camera, replace "Camera Name" 
  // in the next line with one from Capture.list()
  myCapture = new Capture(this, width, height, "ManyCam Virtual Webcam-WDM", 30);
}

void captureEvent(Capture myCapture) {
  // read webcam input
  myCapture.read();
}

void draw() {  
  //myCapture.read();
  myCapture.loadPixels();

  // save image for later use
  //curCapture = myCapture.pixels;
  curCapture = lastCapture;
  lastCapture = myCapture;

  // green = RGB 0,255,0
  color green = color(0,255,0);

  if(curCapture!=null){
    // for every pixel in myCapture
    for (int i = 0; i < myCapture.pixels.length; i++) {
      // if myCapture pixel i is same color as current-last capture pixel i
      if(myCapture.pixels[i] == curCapture.pixels[i]){
        // mycapture pixel i is green
        myCapture.pixels[i] = green;
      }
    }
  }
  
  myCapture.updatePixels();
  
  image(myCapture, 0, 0);
}