svoid bwImageSearch_onFound(BWImage big, BWImage pat, float minSimilarity, IVF2<Rect, Double> onFound) {
  int wp = pat.getWidth(), hp = pat.getHeight();
  int w = big.getWidth(), h = big.getHeight();
  float maxError = (1f-minSimilarity)*wp*hp;
  bigloop: for (int y = 0; y < h-hp; y++)
    for (int x = 0; x < w-wp; x++) {
      float diff = bwImageSectionsSimilarity(big, pat, x, y, maxError);
      if (diff <= maxError) {
        maxError = diff;
        double sim = 1-diff/(wp*hp);
        Rect r = new Rect(x, y, wp, hp);
        onFound.get(r, sim);
        ping();
        //if (diff == 0) break bigloop;
      }
    }
}