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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 itkIntensityWindowingImageFilter_h
#define itkIntensityWindowingImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
namespace itk
{
// This functor class applies a linear transformation A.x + B inside a specified
// range. Values below the range are mapped to a constant. Values over the range
// are mapped to another constant.
namespace Functor
{
template <typename TInput, typename TOutput>
class ITK_TEMPLATE_EXPORT IntensityWindowingTransform
{
public:
using RealType = typename NumericTraits<TInput>::RealType;
IntensityWindowingTransform()
: m_Factor(0.0)
, m_Offset(0.0)
, m_OutputMaximum(0)
, m_OutputMinimum(0)
, m_WindowMaximum(0)
, m_WindowMinimum(0)
{}
~IntensityWindowingTransform() = default;
bool
operator==(const IntensityWindowingTransform & other) const
{
return Math::ExactlyEquals(m_Factor, other.m_Factor) && Math::ExactlyEquals(m_Offset, other.m_Offset) &&
Math::ExactlyEquals(m_OutputMaximum, other.m_OutputMaximum) &&
Math::ExactlyEquals(m_OutputMinimum, other.m_OutputMinimum) &&
Math::ExactlyEquals(m_WindowMaximum, other.m_WindowMaximum) &&
Math::ExactlyEquals(m_WindowMinimum, other.m_WindowMinimum);
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(IntensityWindowingTransform);
void
SetFactor(RealType a)
{
m_Factor = a;
}
void
SetOffset(RealType b)
{
m_Offset = b;
}
void
SetOutputMinimum(TOutput min)
{
m_OutputMinimum = min;
}
void
SetOutputMaximum(TOutput max)
{
m_OutputMaximum = max;
}
void
SetWindowMinimum(TInput min)
{
m_WindowMinimum = min;
}
void
SetWindowMaximum(TInput max)
{
m_WindowMaximum = max;
}
inline TOutput
operator()(const TInput & x) const
{
if (x < m_WindowMinimum)
{
return m_OutputMinimum;
}
if (x > m_WindowMaximum)
{
return m_OutputMaximum;
}
const RealType value = static_cast<RealType>(x) * m_Factor + m_Offset;
const auto result = static_cast<TOutput>(value);
return result;
}
private:
RealType m_Factor;
RealType m_Offset;
TOutput m_OutputMaximum;
TOutput m_OutputMinimum;
TInput m_WindowMaximum;
TInput m_WindowMinimum;
};
} // end namespace Functor
/**
* \class IntensityWindowingImageFilter
* \brief Applies a linear transformation to the intensity levels of the
* input Image that are inside a user-defined interval. Values below this
* interval are mapped to a constant. Values over the interval are mapped
* to another constant.
*
* IntensityWindowingImageFilter applies pixel-wise a linear transformation
* to the intensity values of input image pixels. The linear transformation
* is defined by the user in terms of the minimum and maximum values that
* the output image should have and the lower and upper limits of the intensity
* window of the input image. This operation is very common in visualization,
* and can also be applied as a convenient preprocessing operation for image
* segmentation.
*
* All computations are performed in the precision of the input pixel's
* RealType. Before assigning the computed value to the output pixel.
*
* \ingroup IntensityImageFilters MultiThreaded
*
* \ingroup ITKImageIntensity
*
* \sphinx
* \sphinxexample{Filtering/ImageIntensity/IntensityWindowing,Intensity Windowing}
* \endsphinx
*
* \sa RescaleIntensityImageFilter
*/
template <typename TInputImage, typename TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT IntensityWindowingImageFilter
: public UnaryFunctorImageFilter<
TInputImage,
TOutputImage,
Functor::IntensityWindowingTransform<typename TInputImage::PixelType, typename TOutputImage::PixelType>>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(IntensityWindowingImageFilter);
/** Standard class type aliases. */
using Self = IntensityWindowingImageFilter;
using Superclass = UnaryFunctorImageFilter<
TInputImage,
TOutputImage,
Functor::IntensityWindowingTransform<typename TInputImage::PixelType, typename TOutputImage::PixelType>>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using OutputPixelType = typename TOutputImage::PixelType;
using InputPixelType = typename TInputImage::PixelType;
using RealType = typename NumericTraits<InputPixelType>::RealType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(IntensityWindowingImageFilter);
/** Set/Get the values of the maximum and minimum
* intensities of the output image. */
itkSetMacro(OutputMinimum, OutputPixelType);
itkSetMacro(OutputMaximum, OutputPixelType);
itkGetConstReferenceMacro(OutputMinimum, OutputPixelType);
itkGetConstReferenceMacro(OutputMaximum, OutputPixelType);
/** Set/Get the values of the maximum and minimum
* intensities of the input intensity window. */
itkSetMacro(WindowMinimum, InputPixelType);
itkSetMacro(WindowMaximum, InputPixelType);
itkGetConstReferenceMacro(WindowMinimum, InputPixelType);
itkGetConstReferenceMacro(WindowMaximum, InputPixelType);
/** Set/Get the window width and level. This is an alternative API
* to using the SetWindowMinimum()/SetWindowMaximum(). The window
* minimum and maximum are set as [level-window/2,
* level+window/2]. */
void
SetWindowLevel(const InputPixelType & window, const InputPixelType & level);
InputPixelType
GetWindow() const;
InputPixelType
GetLevel() const;
/** Get the Scale and Shift used for the linear transformation
of gray level values.
\warning These Values are only valid after the filter has been updated. */
itkGetConstReferenceMacro(Scale, RealType);
itkGetConstReferenceMacro(Shift, RealType);
/** Process to execute before entering the multithreaded section. */
void
BeforeThreadedGenerateData() override;
void
PrintSelf(std::ostream & os, Indent indent) const override;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<InputPixelType>));
// End concept checking
#endif
protected:
IntensityWindowingImageFilter();
~IntensityWindowingImageFilter() override = default;
private:
RealType m_Scale{};
RealType m_Shift{};
InputPixelType m_WindowMinimum{};
InputPixelType m_WindowMaximum{};
OutputPixelType m_OutputMinimum{};
OutputPixelType m_OutputMaximum{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkIntensityWindowingImageFilter.hxx"
#endif
#endif
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