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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 itkRescaleIntensityImageFilter_h
#define itkRescaleIntensityImageFilter_h
#include "itkUnaryFunctorImageFilter.h"
#include "itkMath.h"
namespace itk
{
// This functor class applies a linear transformation A.x + B
// to input values.
namespace Functor
{
template <typename TInput, typename TOutput>
class ITK_TEMPLATE_EXPORT IntensityLinearTransform
{
public:
using RealType = typename NumericTraits<TInput>::RealType;
IntensityLinearTransform()
{
m_Factor = 1.0;
m_Offset = 0.0;
m_Minimum = NumericTraits<TOutput>::NonpositiveMin();
m_Maximum = NumericTraits<TOutput>::max();
}
~IntensityLinearTransform() = default;
void
SetFactor(RealType a)
{
m_Factor = a;
}
void
SetOffset(RealType b)
{
m_Offset = b;
}
void
SetMinimum(TOutput min)
{
m_Minimum = min;
}
void
SetMaximum(TOutput max)
{
m_Maximum = max;
}
bool
operator==(const IntensityLinearTransform & other) const
{
return Math::ExactlyEquals(m_Factor, other.m_Factor) && Math::ExactlyEquals(m_Offset, other.m_Offset) &&
Math::ExactlyEquals(m_Maximum, other.m_Maximum) && Math::ExactlyEquals(m_Minimum, other.m_Minimum);
}
ITK_UNEQUAL_OPERATOR_MEMBER_FUNCTION(IntensityLinearTransform);
inline TOutput
operator()(const TInput & x) const
{
RealType value = static_cast<RealType>(x) * m_Factor + m_Offset;
auto result = static_cast<TOutput>(value);
result = (result > m_Maximum) ? m_Maximum : result;
result = (result < m_Minimum) ? m_Minimum : result;
return result;
}
private:
RealType m_Factor;
RealType m_Offset;
TOutput m_Maximum;
TOutput m_Minimum;
};
} // end namespace Functor
/**
* \class RescaleIntensityImageFilter
* \brief Applies a linear transformation to the intensity levels of the
* input Image.
*
* RescaleIntensityImageFilter 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.
*
* The following equation gives the mapping of the intensity values
*
* \par
* \f[
* outputPixel = ( inputPixel - inputMin) \cdot
* \frac{(outputMax - outputMin )}{(inputMax - inputMin)} + outputMin
* \f]
*
* All computations are performed in the precision of the input pixel's
* RealType. Before assigning the computed value to the output pixel.
*
* NOTE: In this filter the minimum and maximum values of the input image are
* computed internally using the MinimumMaximumImageCalculator. Users are not
* supposed to set those values in this filter. If you need a filter where you
* can set the minimum and maximum values of the input, please use the
* IntensityWindowingImageFilter. If you want a filter that can use a
* user-defined linear transformation for the intensity, then please use the
* ShiftScaleImageFilter.
*
* \sa IntensityWindowingImageFilter
*
* \ingroup IntensityImageFilters MultiThreaded
*
* \ingroup ITKImageIntensity
*
* \sphinx
* \sphinxexample{Filtering/ImageIntensity/RescaleAnImage,Rescale An Image}
* \endsphinx
*/
template <typename TInputImage, typename TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT RescaleIntensityImageFilter
: public UnaryFunctorImageFilter<
TInputImage,
TOutputImage,
Functor::IntensityLinearTransform<typename TInputImage::PixelType, typename TOutputImage::PixelType>>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(RescaleIntensityImageFilter);
/** Standard class type aliases. */
using Self = RescaleIntensityImageFilter;
using Superclass = UnaryFunctorImageFilter<
TInputImage,
TOutputImage,
Functor::IntensityLinearTransform<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(RescaleIntensityImageFilter);
itkSetMacro(OutputMinimum, OutputPixelType);
itkSetMacro(OutputMaximum, OutputPixelType);
itkGetConstReferenceMacro(OutputMinimum, OutputPixelType);
itkGetConstReferenceMacro(OutputMaximum, OutputPixelType);
/** 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);
/** Get the Minimum and Maximum values of the input image.
\warning These Values are only valid after the filter has been updated */
itkGetConstReferenceMacro(InputMinimum, InputPixelType);
itkGetConstReferenceMacro(InputMaximum, InputPixelType);
/** Process to execute before entering the multithreaded section */
void
BeforeThreadedGenerateData() override;
/** Print internal ivars */
void
PrintSelf(std::ostream & os, Indent indent) const override;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<InputPixelType>));
itkConceptMacro(OutputHasNumericTraitsCheck, (Concept::HasNumericTraits<OutputPixelType>));
itkConceptMacro(RealTypeMultiplyOperatorCheck, (Concept::MultiplyOperator<RealType>));
itkConceptMacro(RealTypeAdditiveOperatorsCheck, (Concept::AdditiveOperators<RealType>));
// End concept checking
#endif
protected:
RescaleIntensityImageFilter();
~RescaleIntensityImageFilter() override = default;
private:
RealType m_Scale{};
RealType m_Shift{};
InputPixelType m_InputMinimum{};
InputPixelType m_InputMaximum{};
OutputPixelType m_OutputMinimum{};
OutputPixelType m_OutputMaximum{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkRescaleIntensityImageFilter.hxx"
#endif
#endif
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