カメラ映像に残像を入れる

/**
* Slow Shutter Video
*
* @author aa_debdeb
* @date 2015/11/08
*/

import processing.video.*;

Capture camera;
color[][] previousPixels;
int frames = 20;

void setup(){
  size(640, 480);
  camera = new Capture(this, width, height);
  camera.start();
  previousPixels = new color[width][height];
}

void draw(){
  
  if(frameCount == 1){
    camera.loadPixels();
    loadPixels();
    for(int x = 0; x < width; x++){
      for(int y = 0; y < height; y++){
        color c = camera.pixels[y * width + x];
        pixels[y * width + x] = c;
        previousPixels[x][y] = c;
       
      }
    }
    updatePixels();
  } else {
    camera.loadPixels();
    loadPixels();
    for(int x = 0; x < width; x++){
      for(int y = 0; y < height; y++){
        color c = camera.pixels[y * width + x];
        color currentPixel = color(
           (red(previousPixels[x][y]) * ((frames - 1) / float(frames))) + (red(c) / float(frames)),
           (green(previousPixels[x][y]) * ((frames - 1) / float(frames))) + (green(c) / float(frames)),
           (blue(previousPixels[x][y]) * ((frames - 1) / float(frames))) + (blue(c) / float(frames)));
        pixels[y * width + x] = currentPixel;
        previousPixels[x][y] = currentPixel;
      }
    }
    updatePixels();
  }
}

void captureEvent(Capture camera){
  camera.read();
}