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sclass ChessOCR_Pipeline {
  replace Segmenter with IF1<BufferedImage, L<Rect>>.
  
  transient BufferedImage inputImage;
  new SeenAndQueue<Rect> possibleBoardPositions;
  new ChessOCR_BoardsFound boardsFound;
  ChessPieceRecognizer pieceRecognizer;
  transient ReliableSingleThread rstProcessPositions = new(r processPositions);
  
  // segmenters
  transient ReliableSingleThread rstRunSegmenters = new(r runSegmenters);
  new SeenAndQueue<Segmenter> segmenters;

  *() {
    possibleBoardPositions.onAddedToQueue(rstProcessPositions);
    segmenters.onAddedToQueue(rstRunSegmenters);
  }
  
  void addSegmenter(Segmenter s) { segmenters.add(s); }
  void addPossiblePosition(Rect r) { possibleBoardPositions.add(r); }
  
  // internal
  
  void processPositions() {
    Rect r;
    while not null (r = possibleBoardPositions.popQueue())
      boardsFound.add(pieceRecognizer.recognizeBoard(clipBufferedImage(inputImage, r)));
  }
  
  void runSegmenters() {
    Segmenter seg;
    while not null (seg = segmenters.popQueue())
      possibleBoardPositions.addAll(seg.get(inputImage));
  }
  
  void cleanMeUp {
    // cancel the threads
    cleanUp(rstProcessPositions);
    cleanUp(rstRunSegmenters);
  }
}