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sclass URecognizer {
  IIntegralImage image;
  
  *() {}
  *(IIntegralImage *image) {}
  *(BufferedImage image) {
    this.image = IntegralImage(image);
  }
  
  // returns 0, 1 or 2
  int posterizeToInt(double x) {
    ret ifloor(clampZeroToOne(x)*3);
  }

  // returns 0, .5 or 1
  double posterizeInPlace(double x) {
    ret posterizeToInt(x)*.5;
  }
  
  class Cell {
    // Which part of the image we are looking at (x/y)
    // dimension 0 = x, dimension 1 = y
    DoubleRange[] clip = new[2];
  
    // color transformations in place
    DoubleRange[] colorClips = new[3];
  
    Cell copy() {
      new Cell c;
      arrayCopy(clip, c.clip);
      arrayCopy(colorClips, c.colorClips);
      ret c;
    }
  
    Rect rectInImage() {
      ret toRect_floor(doubleRectFromRanges(clip[0], clip[1]));
    }
  
    // get color of cell
  
    double color(int channel) {
      double color = ii_averageBrightnessOfArea(image, rectInImage(), channel);
      ret transformBetweenDoubleRanges(color, colorClips[channel], zeroToOne());
    }
    
    // unposterized color of all 3 channels
    double[] color() {
      double[] c = new[3];
      for i to 3:
        c[i] = color(i);
      ret c;
    }
    
    toString {
      ret "Color: " + asList(color());
    }
  
    int posterizedIntColor(int channel) {
      ret posterizeToInt(color(channel));
    }
  
    // get sub-cells
  
    Cell[] split(int dimension) {
      Cell[] cells = new[3];
      for i to 3: cells[i] = slice(dimension, i/3.0, (i+1)/3.0);
      ret cells;
    }
  
    Cell slice(int dimension, double a, double b) {
      Cell c = copy();
      c.clip[dimension] = transformBetweenDoubleRanges(DoubleRange(a, b), zeroToOne(), clip[dimension]);
      ret c;
    }
  }

  // make the root cell
  Cell rootCell() {
    new Cell c;
    c.clip[0] = doubleRange(0, image.getWidth());
    c.clip[1] = doubleRange(0, image.getHeight());
    for i to 3: c.colorClips[i] = doubleRange(0, 255);
    ret c;
  }
}