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sclass II_MultiPatternFinder {
  new L<BWImage> patternImages;
  int scaleWidth = /*256*/100; // width to scale input image to
  
  transient BWIntegralImage ii;
  transient IBWImage scaled;
  transient FoundImg found;

  // only call once
  Iterator<FoundImg> iterator() {
    ret nonNullIterator(mapI(patternImages, func(BWImage pat) {
      FoundImg lastFound = found;
      if (scaled == null || scaled.getWidth() != scaleWidth)
        scaled = virtualScaledIntegralImageBW(ii, w);
      FoundImg found2 = bwImageSearch_best_virtualBig(scaled, pat, found == null ? 0f : found.sim);
      if (found2 != null)
        ret found = found2;
      null;
    }));
  }
}