static float autoCropOfBWImage_blackBG_threshold = 0.2f;

static Rect autoCropOfBWImage_blackBG(BWImage img) {

  ret autoCropOfBWImage(img, new Rect(0, 0, img.getWidth(), img.getHeight()));

}

static Rect autoCropOfBWImage_blackBG(BWImage img, Rect r) {

  ret autoCropOfBWImage(img, r, autoCropOfBWImage_blackBG_threshold);

}

// r = initial rectangle

static Rect autoCropOfBWImage_blackBG(BWImage img, Rect r, float threshold) {

  int x1 = r.x, y1 = r.y, x2 = r.x2(), y2 = r.y2();

  // left side

  end1:

  while (x1 < x2) {

    for (int y = y1; y < y2; y++)

      if (img.getPixel(x1, y) >= threshold)

        break end1;

    x1++;

  }

  // top side

  end2:

  while (y1 < y2) {

    for (int x = x1; x < x2; x++)

      if (img.getPixel(x, y1) >= threshold)

        break end2;

    y1++;

  }

  // right side

  end3:

  while (x2 > x1) {

    for (int y = y1; y < y2; y++)

      if (img.getPixel(x2-1, y) >= threshold)

        break end3;

    x2--;

  }

  // bottom side

  end4:

  while (y2 > y1) {

    for (int x = x1; x < x2; x++)

      if (img.getPixel(x, y2-1) >= threshold)

        break end4;

    y2--;

  }

  if (x2 <= x1 || y2 <= y1)

    return r;

  else

    return new Rect(x1, y1, x2 - x1, y2 - y1);

}