static BufferedImage blurFilterBufferedImage(BufferedImage img) {
  ret blurFilterBufferedImage(1, img);
}

static BufferedImage blurFilterBufferedImage(int hradius, int vradius default hradius, BufferedImage img) {
  if (hradius <= 0 || vradius <= 0) ret img;
  ret new BoxBlurFilter(hradius, vradius).get(img);
}