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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkGradientMagnitudeRecursiveGaussianImageFilter.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkGradientMagnitudeRecursiveGaussianImageFilter_h
#define __itkGradientMagnitudeRecursiveGaussianImageFilter_h
#include "itkNthElementImageAdaptor.h"
#include "itkImage.h"
#include "itkPixelTraits.h"
#include "itkRecursiveGaussianImageFilter.h"
#include "itkInPlaceImageFilter.h"
#include "itkSqrtImageFilter.h"
#include "itkBinaryFunctorImageFilter.h"
namespace itk
{
/** \class GradientMagnitudeRecursiveGaussianImageFilter
* \brief Computes the Magnitude of the Gradient of an image by convolution
* with the first derivative of a Gaussian.
*
* This filter is implemented using the recursive gaussian
* filters
*
*
* \ingroup GradientFilters
* \ingroup Singlethreaded
*/
// NOTE that the ITK_TYPENAME macro has to be used here in lieu
// of "typename" because VC++ doesn't like the typename keyword
// on the defaults of template parameters
template <typename TInputImage,
typename TOutputImage= TInputImage >
class ITK_EXPORT GradientMagnitudeRecursiveGaussianImageFilter:
public InPlaceImageFilter<TInputImage,TOutputImage>
{
public:
/** Standard class typedefs. */
typedef GradientMagnitudeRecursiveGaussianImageFilter Self;
typedef InPlaceImageFilter<TInputImage,TOutputImage> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Pixel Type of the input image */
typedef TInputImage InputImageType;
typedef typename InputImageType::PixelType PixelType;
/** Image dimension. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
typedef typename NumericTraits<PixelType>::RealType RealType;
/** Define the image type for internal computations
RealType is usually 'double' in NumericTraits.
Here we prefer float in order to save memory. */
typedef float InternalRealType;
typedef Image<InternalRealType,
itkGetStaticConstMacro(ImageDimension) > RealImageType;
/** Smoothing filter type */
typedef RecursiveGaussianImageFilter<
RealImageType,
RealImageType
> GaussianFilterType;
/** Derivative filter type, it will be the first in the pipeline */
typedef RecursiveGaussianImageFilter<
InputImageType,
RealImageType
> DerivativeFilterType;
/** Smoothing filter type */
typedef SqrtImageFilter<
RealImageType,
TOutputImage
> SqrtFilterType;
/** Pointer to a gaussian filter. */
typedef typename GaussianFilterType::Pointer GaussianFilterPointer;
/** Pointer to a derivative filter. */
typedef typename DerivativeFilterType::Pointer DerivativeFilterPointer;
typedef typename SqrtFilterType::Pointer SqrtFilterPointer;
/** Pointer to the Output Image */
typedef typename TOutputImage::Pointer OutputImagePointer;
/** Type of the output Image */
typedef TOutputImage OutputImageType;
typedef typename OutputImageType::PixelType OutputPixelType;
/** Auxiliary image for holding the values of the squared gradient components */
typedef Image< InternalRealType,
itkGetStaticConstMacro(ImageDimension) > CumulativeImageType;
typedef typename CumulativeImageType::Pointer CumulativeImagePointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(GradientMagnitudeRecursiveGaussianImageFilter,
InPlaceImageFilter);
/** Set Sigma value. Sigma is measured in the units of image spacing. */
void SetSigma( RealType sigma );
RealType GetSigma();
/** Define which normalization factor will be used for the Gaussian */
void SetNormalizeAcrossScale( bool normalizeInScaleSpace );
itkGetConstMacro( NormalizeAcrossScale, bool );
void SetNumberOfThreads( int nb );
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputHasNumericTraitsCheck,
(Concept::HasNumericTraits<PixelType>));
/** End concept checking */
#endif
protected:
GradientMagnitudeRecursiveGaussianImageFilter();
virtual ~GradientMagnitudeRecursiveGaussianImageFilter() {};
void PrintSelf(std::ostream& os, Indent indent) const;
/** Generate Data */
void GenerateData( void );
/** GradientMagnitudeRecursiveGaussianImageFilter needs all of the
* input to produce an output. Therefore,
* GradientMagnitudeRecursiveGaussianImageFilter needs to provide an
* implementation for GenerateInputRequestedRegion in order to
* inform the pipeline execution model. \sa
* ImageToImageFilter::GenerateInputRequestedRegion() */
virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);
/** GradientMagnitudeRecursiveGaussianImageFilter produces all of
* the output. Therefore, it needs to provide an implementation of
* EnlargeOutputRequestedRegion(). */
void EnlargeOutputRequestedRegion(DataObject *output);
private:
GradientMagnitudeRecursiveGaussianImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
class SqrSpacing
{
public:
SqrSpacing() : m_Spacing(0) {};
~SqrSpacing() {};
bool operator!=( const SqrSpacing & other ) const
{
return !(*this == other);
}
bool operator==( const SqrSpacing & other ) const
{
return other.m_Spacing == m_Spacing;
}
inline InternalRealType operator()( const InternalRealType & a, const InternalRealType & b )
{
return a + vnl_math_sqr( b / m_Spacing );
}
double m_Spacing;
};
typedef BinaryFunctorImageFilter< RealImageType, RealImageType, RealImageType, SqrSpacing > SqrSpacingFilterType;
typedef typename SqrSpacingFilterType::Pointer SqrSpacingFilterPointer;
GaussianFilterPointer m_SmoothingFilters[ImageDimension-1];
DerivativeFilterPointer m_DerivativeFilter;
SqrSpacingFilterPointer m_SqrSpacingFilter;
SqrtFilterPointer m_SqrtFilter;
/** Normalize the image across scale space */
bool m_NormalizeAcrossScale;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkGradientMagnitudeRecursiveGaussianImageFilter.txx"
#endif
#endif
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