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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 itkHessianRecursiveGaussianImageFilter_h
#define itkHessianRecursiveGaussianImageFilter_h
#include "itkRecursiveGaussianImageFilter.h"
#include "itkNthElementImageAdaptor.h"
#include "itkImage.h"
#include "itkSymmetricSecondRankTensor.h"
#include "itkPixelTraits.h"
namespace itk
{
/** \class HessianRecursiveGaussianImageFilter
* \brief Computes the Hessian matrix of an image by convolution
* with the Second and Cross derivatives of a Gaussian.
*
* This filter is implemented using the recursive gaussian
* filters
*
*
* \ingroup GradientFilters
* \ingroup SingleThreaded
* \ingroup ITKImageFeature
*/
// NOTE that the 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 = Image< SymmetricSecondRankTensor<
typename NumericTraits< typename TInputImage::PixelType >::RealType,
TInputImage::ImageDimension >,
TInputImage::ImageDimension > >
class ITK_TEMPLATE_EXPORT HessianRecursiveGaussianImageFilter:
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/** Standard class typedefs. */
typedef HessianRecursiveGaussianImageFilter Self;
typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Pixel Type of the input image */
typedef TInputImage InputImageType;
typedef typename TInputImage::PixelType PixelType;
typedef typename NumericTraits< PixelType >::RealType RealType;
/** Image dimension. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
/** Number of smoothing filters. */
itkStaticConstMacro(NumberOfSmoothingFilters, unsigned int,
TInputImage::ImageDimension > 2 ? TInputImage::ImageDimension - 2 : 0);
/** 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, TInputImage::ImageDimension >
RealImageType;
/** Output Image Nth Element Adaptor
* This adaptor allows to use conventional scalar
* smoothing filters to compute each one of the
* components of the gradient image pixels. */
typedef NthElementImageAdaptor< TOutputImage,
InternalRealType > OutputImageAdaptorType;
typedef typename OutputImageAdaptorType::Pointer OutputImageAdaptorPointer;
/** Smoothing filter type */
typedef RecursiveGaussianImageFilter<
RealImageType,
RealImageType
> GaussianFilterType;
/** Derivative filter type, it will be the first in the pipeline */
typedef RecursiveGaussianImageFilter<
InputImageType,
RealImageType
> DerivativeFilterAType;
typedef RecursiveGaussianImageFilter<
RealImageType,
RealImageType
> DerivativeFilterBType;
/** Pointer to a gaussian filter. */
typedef typename GaussianFilterType::Pointer GaussianFilterPointer;
typedef std::vector< GaussianFilterPointer > GaussianFiltersArray;
/** Pointer to a derivative filter. */
typedef typename DerivativeFilterAType::Pointer DerivativeFilterAPointer;
typedef typename DerivativeFilterBType::Pointer DerivativeFilterBPointer;
/** Pointer to the Output Image */
typedef typename TOutputImage::Pointer OutputImagePointer;
/** Type of the output Image */
typedef TOutputImage OutputImageType;
typedef typename OutputImageType::PixelType OutputPixelType;
typedef typename PixelTraits< OutputPixelType >::ValueType OutputComponentType;
/** Run-time type information (and related methods). */
itkTypeMacro(HessianRecursiveGaussianImageFilter, ImageToImageFilter);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Set Sigma value. Sigma is measured in the units of image spacing. */
void SetSigma(RealType sigma);
RealType GetSigma() const;
/** Define which normalization factor will be used for the Gaussian
* \sa RecursiveGaussianImageFilter::SetNormalizeAcrossScale
*/
void SetNormalizeAcrossScale(bool normalizeInScaleSpace);
itkGetConstMacro(NormalizeAcrossScale, bool);
/** HessianRecursiveGaussianImageFilter needs all of the input to produce an
* output. Therefore, HessianRecursiveGaussianImageFilter needs to provide
* an implementation for GenerateInputRequestedRegion in order to inform
* the pipeline execution model.
* \sa ImageToImageFilter::GenerateInputRequestedRegion() */
virtual void GenerateInputRequestedRegion() ITK_OVERRIDE;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( InputHasNumericTraitsCheck,
( Concept::HasNumericTraits< PixelType > ) );
itkConceptMacro( OutputHasPixelTraitsCheck,
( Concept::HasPixelTraits< OutputPixelType > ) );
// End concept checking
#endif
protected:
HessianRecursiveGaussianImageFilter();
virtual ~HessianRecursiveGaussianImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** Generate Data */
void GenerateData(void) ITK_OVERRIDE;
// Override since the filter produces the entire dataset
void EnlargeOutputRequestedRegion(DataObject *output) ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(HessianRecursiveGaussianImageFilter);
GaussianFiltersArray m_SmoothingFilters;
DerivativeFilterAPointer m_DerivativeFilterA;
DerivativeFilterBPointer m_DerivativeFilterB;
OutputImageAdaptorPointer m_ImageAdaptor;
/** Normalize the image across scale space */
bool m_NormalizeAcrossScale;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkHessianRecursiveGaussianImageFilter.hxx"
#endif
#endif
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