ウェブカメラに写る歩行者をProcessingで消す方法 http://blog.unfindable.net/archives/7642

pedestrian-eraser.pde

import processing.video.*;

Capture capture;
int t = 0;
int mask = (1 << 8) - 1;

void setup() {
  size(640, 480);
  background(0);
  capture = new Capture(this, 640, 480);
  capture.start();
}

void draw() {
  if (mousePressed) {
    t = 0;
  }
  if (capture.available() == true) {
    capture.read();
    loadPixels();
    for (int i = 0; i < width * height; ++i) {
      //pixels[i] = cam.pixels[i];
      color accum = pixels[i];
      color now = capture.pixels[i];
      int b = ((accum & mask) * t + (now & mask)) / (t + 1);
      int g = (((accum >> 8) & mask) * t + ((now >> 8) & mask)) / (t + 1);
      int r = (((accum >> 16) & mask) * t + ((now >> 16) & mask)) / (t + 1);
      pixels[i] = color(r, g, b);
    }
    ++t;
    updatePixels();
  }
}