itkKLMSegmentationBorder.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef __itkKLMSegmentationBorder_h
#define __itkKLMSegmentationBorder_h

#include "itkSegmentationBorder.h"
#include "itkKLMSegmentationRegion.h"
#include "itkMacro.h"

#include "vnl/vnl_math.h"
#include "vnl/vnl_vector.h"

namespace itk
{
template< class TBorder >
class KLMDynamicBorderArray
{
public:
  bool operator>(const KLMDynamicBorderArray< TBorder > & rhs) const
  {
    if ( m_Pointer->GetLambda() == rhs.m_Pointer->GetLambda() )
      {
      if ( m_Pointer->GetLambda() < 0 )
        {
        return ( m_Pointer > rhs.m_Pointer );
        }
      else
        {
        // The purpose of this comparison is to not let any one region
        // get more borders than another region.  In the degenerate
        // case of an image where the Lambdas are always equal to some
        // constant C, allowing a single region to be repeatedly
        // merged so that it gains many borders will result in
        // pathologically slow behavior.
        double v1 = vnl_math_max(
          static_cast< double >( m_Pointer->GetRegion1()->GetRegionBorderSize() ),
          static_cast< double >( m_Pointer->GetRegion2()->GetRegionBorderSize() ) );

        double v2 = vnl_math_max(
          static_cast< double >( rhs.m_Pointer->GetRegion1()->GetRegionBorderSize() ),
          static_cast< double >( rhs.m_Pointer->GetRegion2()->GetRegionBorderSize() ) );

        return ( v1 > v2 );
        }
      }
    return ( m_Pointer->GetLambda() > rhs.m_Pointer->GetLambda() );
  }

  bool operator>(const KLMDynamicBorderArray< TBorder > *rhs) const
  {
    if ( m_Pointer->GetLambda() == rhs->m_Pointer->GetLambda() )
      {
      if ( m_Pointer->GetLambda() < 0 )
        {
        return ( m_Pointer > rhs->m_Pointer );
        }
      else
        {
        // The purpose of this comparison is to not let any one region
        // get more borders than another region.  In the degenerate
        // case of an image where the Lambdas are always equal to some
        // constant C, allowing a single region to be repeatedly
        // merged so that it gains many borders will result in
        // pathologically slow behavior.
        double v1 = vnl_math_max(
          static_cast< double >( m_Pointer->GetRegion1()->GetRegionBorderSize() ),
          static_cast< double >( m_Pointer->GetRegion2()->GetRegionBorderSize() ) );

        double v2 = vnl_math_max(
          static_cast< double >( rhs->m_Pointer->GetRegion1()->GetRegionBorderSize() ),
          static_cast< double >( rhs->m_Pointer->GetRegion2()->GetRegionBorderSize() ) );

        return ( v1 > v2 );
        }
      }
    return ( m_Pointer->GetLambda() > rhs->m_Pointer->GetLambda() );
  }

  TBorder *m_Pointer;
};

class KLMSegmentationRegion;

class ITK_EXPORT KLMSegmentationBorder:public SegmentationBorder
{
public:
  typedef KLMSegmentationBorder      Self;
  typedef SegmentationBorder         Superclass;
  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro(KLMSegmentationBorder, SegmentationBorder);

  void SetRegion1(KLMSegmentationRegion *Region1);

  KLMSegmentationRegion * GetRegion1();

  void SetRegion2(KLMSegmentationRegion *Region2);

  KLMSegmentationRegion * GetRegion2();

  itkSetMacro(Lambda, double);
  itkGetConstReferenceMacro(Lambda, double);

  void EvaluateLambda();

  void PrintBorderInfo();

protected:
  KLMSegmentationBorder();

  ~KLMSegmentationBorder();

  void PrintSelf(std::ostream & os, Indent indent) const;

private:
  KLMSegmentationBorder(const Self &); //purposely not implemented
  void operator=(const Self &);        //purposely not implemented

  double                 m_Lambda;
  KLMSegmentationRegion *m_Region1;
  KLMSegmentationRegion *m_Region2;
};
} // end namespace itk

#endif