static BufferedImage minFilterBufferedImage(BufferedImage img) {
  ret MinimumFilter(1).get(img);
}

static BufferedImage minFilterBufferedImage(int radius, BufferedImage img) {
  ret MinimumFilter(radius).get(img);
}

static BufferedImage minFilterBufferedImage(int hradius, int vradius, BufferedImage img) {
  ret MinimumFilter(hradius, vradius).get(img);
}