Threshold effect

import gohai.glvideo.*;
GLCapture video;

void setup() {
  size(640, 480, P2D);

  // this will use the first recognized camera by default
  video = new GLCapture(this);
  video.start();
}

void draw() {
  background(0);
  if (video.available()) {
    video.read();
  }
  image(video, 0, 0, width, height);
  // Apply a threshold filter with parameter level 0.5
  filter(THRESHOLD, 0.5);
}