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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 itkThresholdLabelerImageFilter_h
#define itkThresholdLabelerImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
#include "itkConceptChecking.h"
namespace itk
{
/** \class ThresholdLabelerImageFilter
*
* \brief Label an input image according to a set of thresholds.
*
* This filter produces an output image whose pixels are labeled
* progressively according to the classes identified by a set of thresholds.
* Values equal to a threshold is considered to be in the lower class.
*
* This filter is templated over the input image type
* and the output image type.
*
* The filter expect both images to have the same number of dimensions.
*
* \ingroup IntensityImageFilters MultiThreaded
* \ingroup ITKThresholding
*/
namespace Functor
{
template< typename TInput, typename TOutput >
class ITK_TEMPLATE_EXPORT ThresholdLabeler
{
public:
ThresholdLabeler() { m_LabelOffset = NumericTraits< TOutput >::OneValue(); }
~ThresholdLabeler() {}
typedef typename NumericTraits< TInput >::RealType RealThresholdType;
typedef std::vector< RealThresholdType > RealThresholdVector;
/** Set the vector of thresholds. */
void SetThresholds(const RealThresholdVector & thresholds)
{ m_Thresholds = thresholds; }
/** Set the offset which labels have to start from. */
void SetLabelOffset(const TOutput & labelOffset)
{ m_LabelOffset = labelOffset; }
bool operator!=(const ThresholdLabeler & other) const
{
if ( m_Thresholds != other.m_Thresholds
|| m_LabelOffset != other.m_LabelOffset )
{
return true;
}
return false;
}
bool operator==(const ThresholdLabeler & other) const
{
return !( *this != other );
}
inline TOutput operator()(const TInput & A) const
{
size_t size = m_Thresholds.size();
if ( size == 0 )
{
return m_LabelOffset;
}
if ( A <= m_Thresholds[0] )
{
return m_LabelOffset;
}
for ( size_t i = 0; i < size - 1; i++ )
{
/* Value is in this class if it equals the upper bound. */
if ( m_Thresholds[i] < A && A <= m_Thresholds[i + 1] )
{
return static_cast< TOutput >( i + 1 ) + m_LabelOffset;
}
}
return static_cast< TOutput >( size ) + m_LabelOffset;
}
private:
RealThresholdVector m_Thresholds;
TOutput m_LabelOffset;
};
}
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_EXPORT ThresholdLabelerImageFilter:
public
UnaryFunctorImageFilter< TInputImage, TOutputImage,
Functor::ThresholdLabeler<
typename TInputImage::PixelType,
typename TOutputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef ThresholdLabelerImageFilter Self;
typedef UnaryFunctorImageFilter<
TInputImage, TOutputImage,
Functor::ThresholdLabeler<
typename TInputImage::PixelType,
typename TOutputImage::PixelType >
> Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(ThresholdLabelerImageFilter, UnaryFunctorImageFilter);
/** Pixel types. */
typedef typename TInputImage::PixelType InputPixelType;
typedef typename TOutputImage::PixelType OutputPixelType;
/** Threshold vector types. */
typedef std::vector< InputPixelType > ThresholdVector;
typedef typename NumericTraits< InputPixelType >::RealType RealThresholdType;
typedef std::vector< RealThresholdType > RealThresholdVector;
/** The input and output pixel types must support comparison operators. */
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( PixelTypeComparable,
( Concept::Comparable< InputPixelType > ) );
itkConceptMacro( OutputPixelTypeComparable,
( Concept::Comparable< OutputPixelType > ) );
itkConceptMacro( OutputPixelTypeOStreamWritable,
( Concept::OStreamWritable< OutputPixelType > ) );
// End concept checking
#endif
/** Set the vector of thresholds. */
void SetThresholds(const ThresholdVector & thresholds)
{
m_Thresholds = thresholds;
m_RealThresholds.clear();
typename ThresholdVector::const_iterator itr = m_Thresholds.begin();
while ( itr != m_Thresholds.end() )
{
m_RealThresholds.push_back( static_cast< RealThresholdType >( *itr ) );
++itr;
}
this->Modified();
}
/** Get the vector of thresholds. */
const ThresholdVector & GetThresholds() const
{ return m_Thresholds; }
/** Set the vector of real type thresholds. */
void SetRealThresholds(const RealThresholdVector & thresholds)
{
m_RealThresholds = thresholds;
m_Thresholds.clear();
typename RealThresholdVector::const_iterator itr = m_RealThresholds.begin();
while ( itr != m_RealThresholds.end() )
{
m_Thresholds.push_back( static_cast< InputPixelType >( *itr ) );
++itr;
}
this->Modified();
}
/** Get the vector of real thresholds. */
const RealThresholdVector & GetRealThresholds() const
{ return m_RealThresholds; }
/** Set the offset which labels have to start from. */
itkSetClampMacro( LabelOffset, OutputPixelType, NumericTraits< OutputPixelType >::ZeroValue(),
NumericTraits< OutputPixelType >::max() );
itkGetConstMacro(LabelOffset, OutputPixelType);
protected:
ThresholdLabelerImageFilter();
virtual ~ThresholdLabelerImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** This method is used to set the state of the filter before
* multi-threading. */
virtual void BeforeThreadedGenerateData() ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(ThresholdLabelerImageFilter);
ThresholdVector m_Thresholds;
RealThresholdVector m_RealThresholds;
OutputPixelType m_LabelOffset;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkThresholdLabelerImageFilter.hxx"
#endif
#endif
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