static float bottomLeftCornerIs_similarity = 0.99f;

static bool bottomLeftCornerIs(S imageID) {
  BWImage pat = loadBWImage(imageID);
  int w = pat.getWidth(), h = pat.getHeight();
  ret bwImagesSimilar(pat, new BWImage(shootBottomLeftCorner2(w, h)), bottomLeftCornerIs_similarity);
}