Average.java

/**
 * This file is part of VisiCut.
 * Copyright (C) 2012 Thomas Oster <thomas.oster@rwth-aachen.de>
 * RWTH Aachen University - 52062 Aachen, Germany
 *
 *     VisiCut is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *    VisiCut is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with VisiCut.  If not, see <http://www.gnu.org/licenses/>.
 **/
package com.t_oster.liblasercut.dithering;

import com.t_oster.liblasercut.BlackWhiteRaster;
import com.t_oster.liblasercut.GreyscaleRaster;

/**
 *
 * @author Thomas Oster <thomas.oster@rwth-aachen.de>
 */
public class Average extends  DitheringAlgorithm
{

  @Override
  protected void doDithering(GreyscaleRaster src, BlackWhiteRaster target)
  {
    long lumTotal = 0;
    int pixelcount = 0;
    int width = src.getWidth();
    int height = src.getHeight();

    for (int y = 0; y < height; y++)
    {
      for (int x = 0; x < width; x++)
      {
        lumTotal += src.getGreyScale(x, y);
      }
      setProgress((100 * pixelcount++) / (2 * height));
    }

    int thresh = (int) (lumTotal / height / width);
    for (int y = 0; y < height; y++)
    {
      for (int x = 0; x < width; x++)
      {
        this.setBlack(src, target, x, y, src.getGreyScale(x, y) < thresh);
      }
      setProgress((100 * pixelcount++) / (2 * height));
    }
  }

  @Override
  public DitheringAlgorithm clone() {
    return new Average();
  }

  @Override
  public String toString()
  {
    return "Average Dithering";
  }
}