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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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() = default;
using RealThresholdType = typename NumericTraits<TInput>::RealType;
using RealThresholdVector = std::vector<RealThresholdType>;
/** 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
{
return m_Thresholds == other.m_Thresholds && m_LabelOffset == other.m_LabelOffset;
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(ThresholdLabeler);
inline TOutput
operator()(const TInput & A) const
{
// When there are N thresholds, they divide values into N+1 buckets, which we number
// 0, ..., N. Each bucket represents a half-open interval of values (A, B]. The
// variables low, mid, and high refer to buckets. The inclusive range [low, high]
// are the buckets that are not yet ruled out. We repeatedly bisect this range
// using the variable `mid`. In the case of ties, this method returns the lowest
// bucket index for which `A` is less than or equal to the bucket's upper limit.
size_t low = 0;
size_t high = m_Thresholds.size();
while (low < high)
{
const size_t mid = (low + high) / 2;
if (A <= m_Thresholds[mid])
{
high = mid;
}
else
{
low = mid + 1;
}
}
// The computed bucket index is relative to m_LabelOffset.
return static_cast<TOutput>(low) + m_LabelOffset;
}
private:
RealThresholdVector m_Thresholds;
TOutput m_LabelOffset;
};
} // namespace Functor
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT ThresholdLabelerImageFilter
: public UnaryFunctorImageFilter<
TInputImage,
TOutputImage,
Functor::ThresholdLabeler<typename TInputImage::PixelType, typename TOutputImage::PixelType>>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ThresholdLabelerImageFilter);
/** Standard class type aliases. */
using Self = ThresholdLabelerImageFilter;
using Superclass = UnaryFunctorImageFilter<
TInputImage,
TOutputImage,
Functor::ThresholdLabeler<typename TInputImage::PixelType, typename TOutputImage::PixelType>>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(ThresholdLabelerImageFilter);
/** Pixel types. */
using InputPixelType = typename TInputImage::PixelType;
using OutputPixelType = typename TOutputImage::PixelType;
/** Threshold vector types. */
using ThresholdVector = std::vector<InputPixelType>;
using RealThresholdType = typename NumericTraits<InputPixelType>::RealType;
using RealThresholdVector = std::vector<RealThresholdType>;
/** 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, OutputPixelType{}, NumericTraits<OutputPixelType>::max());
itkGetConstMacro(LabelOffset, OutputPixelType);
protected:
ThresholdLabelerImageFilter();
~ThresholdLabelerImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** This method is used to set the state of the filter before
* multi-threading. */
void
BeforeThreadedGenerateData() override;
private:
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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