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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkShapeKeepNObjectsLabelMapFilter.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkShapeKeepNObjectsLabelMapFilter_h
#define __itkShapeKeepNObjectsLabelMapFilter_h
#include "itkInPlaceLabelMapFilter.h"
#include "itkLabelObjectAccessors.h"
#include "itkShapeLabelObjectAccessors.h"
#include "itkProgressReporter.h"
namespace itk {
/** \class ShapeKeepNObjectsLabelMapFilter
* \brief Keep N objects according to their shape attributes.
*
* The ShapeKeepNObjectsLabelMapFilter keeps N objects in a label collection image with the
* highest (or lowest) attribute value. The attributes values are those of the ShapeLabelObject.
*
* This implementation was taken from the Insight Journal paper:
* http://hdl.handle.net/1926/584 or
* http://www.insight-journal.org/browse/publication/176
*
* \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
*
* \sa ShapeLabelObject, BinaryShapeKeepNObjectsImageFilter, LabelStatisticsKeepNObjectsImageFilter
* \ingroup ImageEnhancement MathematicalMorphologyImageFilters
*/
template<class TImage>
class ITK_EXPORT ShapeKeepNObjectsLabelMapFilter :
public InPlaceLabelMapFilter<TImage>
{
public:
/** Standard class typedefs. */
typedef ShapeKeepNObjectsLabelMapFilter Self;
typedef InPlaceLabelMapFilter<TImage> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Some convenient typedefs. */
typedef TImage ImageType;
typedef typename ImageType::Pointer ImagePointer;
typedef typename ImageType::ConstPointer ImageConstPointer;
typedef typename ImageType::PixelType PixelType;
typedef typename ImageType::IndexType IndexType;
typedef typename ImageType::LabelObjectType LabelObjectType;
typedef typename LabelObjectType::AttributeType AttributeType;
typedef typename Superclass::LabelObjectContainerType LabelObjectContainerType;
/** ImageDimension constants */
itkStaticConstMacro(ImageDimension, unsigned int, TImage::ImageDimension);
/** Standard New method. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(ShapeKeepNObjectsLabelMapFilter, InPlaceLabelMapFilter);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
/* itkConceptMacro(InputEqualityComparableCheck,
(Concept::EqualityComparable<InputImagePixelType>));
itkConceptMacro(IntConvertibleToInputCheck,
(Concept::Convertible<int, InputImagePixelType>));
itkConceptMacro(InputOStreamWritableCheck,
(Concept::OStreamWritable<InputImagePixelType>));*/
/** End concept checking */
#endif
/**
* Set/Get the ordering of the objects. By default, the ones with the
* highest value are kept. Turning ReverseOrdering to true make this filter
* keep the objects with the smallest values
*/
itkSetMacro( ReverseOrdering, bool );
itkGetConstReferenceMacro( ReverseOrdering, bool );
itkBooleanMacro( ReverseOrdering );
/**
* Set/Get the number of objects to keep
*/
itkSetMacro( NumberOfObjects, unsigned long );
itkGetConstReferenceMacro( NumberOfObjects, unsigned long );
/**
* Set/Get the attribute to use to select the object to keep.
* Default is "Size".
*/
itkGetConstMacro( Attribute, AttributeType );
itkSetMacro( Attribute, AttributeType );
void SetAttribute( const std::string & s )
{
this->SetAttribute( LabelObjectType::GetAttributeFromName( s ) );
}
protected:
ShapeKeepNObjectsLabelMapFilter();
~ShapeKeepNObjectsLabelMapFilter() {};
void GenerateData();
template <class TAttributeAccessor>
void TemplatedGenerateData( const TAttributeAccessor & )
{
// Allocate the output
this->AllocateOutputs();
ImageType * output = this->GetOutput();
ImageType * output2 = this->GetOutput( 1 );
// set the background value for the second output - this is not done in the superclasses
output2->SetBackgroundValue( output->GetBackgroundValue() );
const LabelObjectContainerType & labelObjectContainer = output->GetLabelObjectContainer();
typedef typename LabelObjectType::Pointer LabelObjectPointer;
typedef std::vector< LabelObjectPointer > VectorType;
ProgressReporter progress( this, 0, 2 * labelObjectContainer.size() );
// get the label objects in a vector, so they can be sorted
VectorType labelObjects;
labelObjects.reserve( labelObjectContainer.size() );
typename LabelObjectContainerType::const_iterator it = labelObjectContainer.begin();
while( it != labelObjectContainer.end() )
{
labelObjects.push_back( it->second );
progress.CompletedPixel();
it++;
}
// instantiate the comparator and sort the vector
if( m_NumberOfObjects < labelObjectContainer.size() )
{
typename VectorType::iterator end = labelObjects.begin() + m_NumberOfObjects;
if( m_ReverseOrdering )
{
Functor::LabelObjectReverseComparator< LabelObjectType, TAttributeAccessor > comparator;
std::nth_element( labelObjects.begin(), end, labelObjects.end(), comparator );
}
else
{
Functor::LabelObjectComparator< LabelObjectType, TAttributeAccessor > comparator;
std::nth_element( labelObjects.begin(), end, labelObjects.end(), comparator );
}
progress.CompletedPixel();
// and remove the last objects of the map
for( typename VectorType::const_iterator it2 = end;
it2 != labelObjects.end();
it2++ )
{
output2->AddLabelObject( *it2 );
output->RemoveLabelObject( *it2 );
progress.CompletedPixel();
}
}
}
void PrintSelf(std::ostream& os, Indent indent) const;
bool m_ReverseOrdering;
unsigned long m_NumberOfObjects;
AttributeType m_Attribute;
private:
ShapeKeepNObjectsLabelMapFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
}; // end of class
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkShapeKeepNObjectsLabelMapFilter.txx"
#endif
#endif
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