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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 itkShapeKeepNObjectsLabelMapFilter_h
#define itkShapeKeepNObjectsLabelMapFilter_h
#include "itkInPlaceLabelMapFilter.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:
* https://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
* \ingroup ITKLabelMap
*/
template< typename TImage >
class ITK_TEMPLATE_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;
/** 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, SizeValueType);
itkGetConstReferenceMacro(NumberOfObjects, SizeValueType);
/**
* 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() ITK_OVERRIDE {}
void GenerateData() ITK_OVERRIDE;
template< typename 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() );
typedef typename LabelObjectType::Pointer LabelObjectPointer;
typedef std::vector< LabelObjectPointer > VectorType;
ProgressReporter progress( this, 0, 2 * output->GetNumberOfLabelObjects() );
// get the label objects in a vector, so they can be sorted
VectorType labelObjects;
labelObjects.reserve( output->GetNumberOfLabelObjects() );
typename ImageType::Iterator it( output );
while ( ! it.IsAtEnd() )
{
labelObjects.push_back( it.GetLabelObject() );
progress.CompletedPixel();
++it;
}
// instantiate the comparator and sort the vector
if ( m_NumberOfObjects < output->GetNumberOfLabelObjects() )
{
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 ITK_OVERRIDE;
bool m_ReverseOrdering;
SizeValueType m_NumberOfObjects;
AttributeType m_Attribute;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(ShapeKeepNObjectsLabelMapFilter);
}; // end of class
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkShapeKeepNObjectsLabelMapFilter.hxx"
#endif
#endif
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