dcmimage/include/diqtctab.h

/*
 *
 *  Copyright (C) 2002-2003, OFFIS
 *
 *  This software and supporting documentation were developed by
 *
 *    Kuratorium OFFIS e.V.
 *    Healthcare Information and Communication Systems
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *  THIS SOFTWARE IS MADE AVAILABLE,  AS IS,  AND OFFIS MAKES NO  WARRANTY
 *  REGARDING  THE  SOFTWARE,  ITS  PERFORMANCE,  ITS  MERCHANTABILITY  OR
 *  FITNESS FOR ANY PARTICULAR USE, FREEDOM FROM ANY COMPUTER DISEASES  OR
 *  ITS CONFORMITY TO ANY SPECIFICATION. THE ENTIRE RISK AS TO QUALITY AND
 *  PERFORMANCE OF THE SOFTWARE IS WITH THE USER.
 *
 *  Module:  dcmimage
 *
 *  Author:  Marco Eichelberg
 *
 *  Purpose: class DcmQuantColorTable
 *
 *  Last Update:      $Author: joergr $
 *  Update Date:      $Date: 2003/12/23 12:15:40 $
 *  CVS/RCS Revision: $Revision: 1.5 $
 *  Status:           $State: Exp $
 *
 *  CVS/RCS Log at end of file
 *
 */


#ifndef DIQTCTAB_H
#define DIQTCTAB_H

#include "osconfig.h"
#include "oftypes.h"   /* for OFBool */
#include "ofcond.h"    /* for OFCondition */
#include "diqtpix.h"   /* for DcmQuantPixel */
#include "diqthash.h"  /* for DcmQuantHistogramItem */
#include "ofstring.h"  /* for class OFString */


class DicomImage;
class DcmItem;


class DcmQuantColorTable
{
public:

  DcmQuantColorTable();

  ~DcmQuantColorTable();

  void clear();

  inline unsigned long getColors() const
  {
    return numColors;
  }

  void setDescriptionString(OFString& str) const;

  OFCondition computeHistogram(DicomImage& image, unsigned long maxcolors);

  inline unsigned long getMaxVal() const
  {
    return maxval;
  }

  inline const DcmQuantPixel& getPixel(unsigned long idx) const
  {
#ifdef DEBUG
    assert(array && idx < numColors);
#endif
    return *(array[idx]);
  }

  inline DcmQuantComponent getRed(unsigned long idx) const
  {
#ifdef DEBUG
    assert(array && idx < numColors);
#endif
    return array[idx]->getRed();
  }

  inline DcmQuantComponent getGreen(unsigned long idx) const
  {
#ifdef DEBUG
    assert(array && idx < numColors);
#endif
    return array[idx]->getGreen();
  }

  inline DcmQuantComponent getBlue(unsigned long idx) const
  {
#ifdef DEBUG
    assert(array && idx < numColors);
#endif
    return array[idx]->getBlue();
  }

  OFCondition medianCut(
    DcmQuantColorTable& histogram,
    unsigned long sum,
    unsigned long theMaxval,
    unsigned long numberOfColors,
    DcmLargestDimensionType largeType,
    DcmRepresentativeColorType repType);

  inline int computeIndex(const DcmQuantPixel& px) const
  {
    int result = -1;
    register int r2, g2, b2;
    register long newdist;
    register int r1 = OFstatic_cast(int, px.getRed());
    register int g1 = OFstatic_cast(int, px.getGreen());
    register int b1 = OFstatic_cast(int, px.getBlue());
    register long dist = 2000000000;
    for (unsigned long i = 0; i < numColors; ++i)
    {
        r2 = r1 - OFstatic_cast(int, array[i]->getRed());
        g2 = g1 - OFstatic_cast(int, array[i]->getGreen());
        b2 = b1 - OFstatic_cast(int, array[i]->getBlue());
        newdist = r2*r2 + g2*g2 + b2*b2;
        if (newdist < dist)
        {
            result = OFstatic_cast(int, i);
            dist = newdist;
            if (dist < array[i]->getValue()) i=numColors; // break out of for loop
        }
    }
    return result;
  }

  OFCondition write(
    DcmItem& target,
    OFBool writeAsOW,
    OFBool write16BitEntries);


private:

  void computeClusters();

  DcmQuantColorTable(const DcmQuantColorTable& src);

  DcmQuantColorTable& operator=(const DcmQuantColorTable& src);

  DcmQuantHistogramItemPointer *array;

  unsigned long numColors;

  unsigned long maxval;

};

#endif


/*
 * CVS/RCS Log:
 * $Log: diqtctab.h,v $
 * Revision 1.5  2003/12/23 12:15:40  joergr
 * Adapted type casts to new-style typecast operators defined in ofcast.h.
 * Updated copyright header.
 *
 * Revision 1.4  2003/07/04 13:25:40  meichel
 * Replaced forward declarations for OFString with explicit includes,
 *   needed when compiling with HAVE_STD_STRING
 *
 * Revision 1.3  2003/06/12 15:09:41  joergr
 * Fixed inconsistent API documentation reported by Doxygen.
 *
 * Revision 1.2  2002/05/15 09:53:29  meichel
 * Minor corrections to avoid warnings on Sun CC 2.0.1
 *
 * Revision 1.1  2002/01/25 13:32:04  meichel
 * Initial release of new color quantization classes and
 *   the dcmquant tool in module dcmimage.
 *
 *
 */

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