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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 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:
typedef typename NumericTraits< TInput >::RealType RealType;
IntensityLinearTransform()
{
m_Factor = 1.0;
m_Offset = 0.0;
m_Minimum = NumericTraits< TOutput >::NonpositiveMin();
m_Maximum = NumericTraits< TOutput >::max();
#if defined (__GNUC__) && (__GNUC__ == 5) && (__GNUC_MINOR__ == 2) && defined(NDEBUG) && defined(__i386__)
m_EpsilonCompensation = static_cast<RealType>(std::numeric_limits<TOutput>::epsilon());
if (m_EpsilonCompensation == 0)
{
m_EpsilonCompensation = std::numeric_limits<RealType>::epsilon();
}
#endif
}
~IntensityLinearTransform() {}
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
{
if ( Math::NotExactlyEquals(m_Factor, other.m_Factor)
|| Math::NotExactlyEquals(m_Offset, other.m_Offset)
|| Math::NotExactlyEquals(m_Maximum, other.m_Maximum)
|| Math::NotExactlyEquals(m_Minimum, other.m_Minimum) )
{
return true;
}
return false;
}
bool operator==(const IntensityLinearTransform & other) const
{
return !( *this != other );
}
inline TOutput operator()(const TInput & x) const
{
#if defined (__GNUC__) && (__GNUC__ == 5) && (__GNUC_MINOR__ == 2) && defined(NDEBUG) && defined(__i386__)
RealType value = static_cast< RealType >( x ) * m_Factor + m_Offset + m_EpsilonCompensation;
TOutput result = static_cast< TOutput >( value ) - static_cast< TOutput >( m_EpsilonCompensation );
#else
RealType value = static_cast< RealType >( x ) * m_Factor + m_Offset;
TOutput result = static_cast< TOutput >( value );
#endif
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;
#if defined (__GNUC__) && (__GNUC__ == 5) && (__GNUC_MINOR__ == 2) && defined(NDEBUG) && defined(__i386__)
RealType m_EpsilonCompensation;
#endif
};
} // 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
*
* \wiki
* \wikiexample{ImageProcessing/RescaleIntensityImageFilter,Rescale the intensity values of an image to a specified range}
* \endwiki
*/
template< typename TInputImage, typename TOutputImage = TInputImage >
class ITK_TEMPLATE_EXPORT RescaleIntensityImageFilter:
public
UnaryFunctorImageFilter< TInputImage, TOutputImage,
Functor::IntensityLinearTransform<
typename TInputImage::PixelType,
typename TOutputImage::PixelType > >
{
public:
/** Standard class typedefs. */
typedef RescaleIntensityImageFilter Self;
typedef UnaryFunctorImageFilter<
TInputImage, TOutputImage,
Functor::IntensityLinearTransform<
typename TInputImage::PixelType,
typename TOutputImage::PixelType > > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
typedef typename TOutputImage::PixelType OutputPixelType;
typedef typename TInputImage::PixelType InputPixelType;
typedef typename NumericTraits< InputPixelType >::RealType RealType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(RescaleIntensityImageFilter,
UnaryFunctorImageFilter);
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() ITK_OVERRIDE;
/** Print internal ivars */
void PrintSelf(std::ostream & os, Indent indent) const ITK_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();
virtual ~RescaleIntensityImageFilter() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(RescaleIntensityImageFilter);
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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