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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 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:
typedef typename NumericTraits< TInput >::RealType RealType;
IntensityWindowingTransform() :
m_Factor(0.0),
m_Offset(0.0),
m_OutputMaximum(0),
m_OutputMinimum(0),
m_WindowMaximum(0),
m_WindowMinimum(0) {}
~IntensityWindowingTransform() {}
bool operator!=(const IntensityWindowingTransform & other) const
{
if ( Math::NotExactlyEquals( m_Factor , other.m_Factor )
|| Math::NotExactlyEquals( m_Offset , other.m_Offset )
|| Math::NotExactlyEquals( m_OutputMaximum, other.m_OutputMaximum )
|| Math::NotExactlyEquals( m_OutputMinimum, other.m_OutputMinimum )
|| Math::NotExactlyEquals( m_WindowMaximum, other.m_WindowMaximum )
|| Math::NotExactlyEquals( m_WindowMinimum, other.m_WindowMinimum ) )
{
return true;
}
return false;
}
bool operator==(const IntensityWindowingTransform & other) const
{
return !( *this != other );
}
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 TOutput 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
*
* \wiki
* \wikiexample{ImageProcessing/IntensityWindowingImageFilter,IntensityWindowingImageFilter}
* \endwiki
*
* \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:
/** Standard class typedefs. */
typedef IntensityWindowingImageFilter Self;
typedef UnaryFunctorImageFilter<
TInputImage, TOutputImage,
Functor::IntensityWindowingTransform<
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(IntensityWindowingImageFilter,
UnaryFunctorImageFilter);
/** 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(void) ITK_OVERRIDE;
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( InputHasNumericTraitsCheck,
( Concept::HasNumericTraits< InputPixelType > ) );
// End concept checking
#endif
protected:
IntensityWindowingImageFilter();
virtual ~IntensityWindowingImageFilter() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(IntensityWindowingImageFilter);
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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