​

function setup() {

  createCanvas(400, 400);

  pixelDensity(1);

  cam = createCapture(VIDEO);

  cam.size(width / vScale, height / vScale);

  noStroke();

}

​

function draw() {

  background(220);

  cam.loadPixels();

​

  for (let y = 0; y < cam.height; y++){

    for(let x = 0; x < cam.width; x++){

      let index = (x + y * cam.width) * 4;

      let r = cam.pixels[index+0];

      let g = cam.pixels[index+1];

      let b = cam.pixels[index+2];

      let brightVal = (r+g+b)/3;

      let thresholdVal = 255/2;

      if (brightVal > thresholdVal) {

        fill(255);

      } else {

        fill(0);

      }

      rect(x*vScale, y*vScale, 20, 20);

    }

  }

}