emojis (live) - OpenProcessing

mySketch
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var img;
var emoji_bright, emoji_dark, emoji_lightgrey, emoji_darkgrey;
var a = 20
​
function preload() {
  //img = loadImage("nasa_buzz.jpg");
  emoji_bright = loadImage("zebra.png");
  emoji_dark = loadImage("buffalo.png");
  emoji_lightgrey = loadImage("dolphin.png");
  emoji_darkgrey = loadImage("elephant.png");
}
​
function setup() {
  createCanvas(640, 480);
​
  img = createCapture(VIDEO);
  img.size(640, 480);
  img.hide();
​
  //noLoop();
}
​
function draw() {
  //image(img, 0, 0);
  background(0);
​
  img.loadPixels();
​
  for (var y = 0; y < img.height; y += a) {
    for (var x = 0; x < img.width; x += a) {
      //var pix = red(img.get(x, y));
      // Fast but complicated
      var pix = img.pixels[(y * img.width + x) * 4];
​
      if (pix <= 63) {
        image(emoji_dark, x, y, a, a);
      } else {
        if (pix <= 120) {
          image(emoji_darkgrey, x, y, a, a);
        } else {
          if (pix <= 180) {
            image(emoji_lightgrey, x, y, a, a);
          } else {
            image(emoji_bright, x, y, a, a);
​
          }
        }
      }
    }
  }
}