<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_o04j0btnfpll9kqriqg72mua2p, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
sinterface IBWIntegralImage extends MakesBufferedImage {
  public int getWidth();
  public int getHeight();
  public int getIIValue(int x, int y);
  
  // 0.0 to 255.0
  default public double getPixelAverage(int x1, int y1, int x2, int y2) {
    int area = (x2-x1)*(y2-y1);
    ret doubleRatio(bwIntegralImage_sumRect(this, x1, y1, x2, y2), area);
  }
  
  default public int getPixel(int x, int y) {
    ret bwIntegralImage_sumRect(this, x, y, x+1, y+1);
  }
  
  // unoptimized
  default public BufferedImage getBufferedImage() {
    ret scaleDownUsingIntegralImageBW(this, getWidth(), getHeight()).getBufferedImage();
  }
}