import processing.video.*;

Capture cam;
int[] noise;
int ticks = 0;

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

  cam = new Capture(this, width, height, 30);
  cam.start();

  noise = new int[width * height];
  for (int i=0; i<width * height; i++) {
    noise[i] = (int)random(256);
  }
}

void draw() {
  if (cam.available() == true) {
    cam.read();
    cam.loadPixels();
    int index = 0;
    for (int y=0; y<height; y++) {
      for (int x=0; x<width; x++) {
        int v = (cam.pixels[index] >> 8) & 0xff;
        v ^= (noise[index] + ticks) & 0xff;
        color c = (v>128)?0xffffff:0;
        //color c = v * 0x10101;
        set(x, y, c);
        index++;
      }
    }
  }
  ticks = (ticks + 1) & 0xff;
}