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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkDerivativeImageFilter.h,v $
Language: C++
Date: $Date: 2006-03-17 14:22:26 $
Version: $Revision: 1.20 $
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 __itkDerivativeImageFilter_h
#define __itkDerivativeImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkConceptChecking.h"
namespace itk
{
/** \class DerivativeImageFilter
* \brief Computes the directional derivative of an image.
* The directional derivative at each pixel location is computed by convolution
* with a derivative operator of user-specified order.
*
* SetOrder specifies the order of the derivative.
*
* SetDirection specifies the direction of the derivative with respect to the
* coordinate axes of the image.
*
* \sa Image
* \sa Neighborhood
* \sa NeighborhoodOperator
* \sa NeighborhoodIterator
*
* \ingroup ImageFeatureExtraction
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT DerivativeImageFilter :
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/** Standard class typedefs. */
typedef DerivativeImageFilter Self;
typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Extract some information from the image types. Dimensionality
* of the two images is assumed to be the same. */
typedef typename TOutputImage::PixelType OutputPixelType;
typedef typename TOutputImage::InternalPixelType OutputInternalPixelType;
typedef typename TInputImage::PixelType InputPixelType;
typedef typename TInputImage::InternalPixelType InputInternalPixelType;
/** Extract some information from the image types. Dimensionality
* of the two images is assumed to be the same. */
itkStaticConstMacro(ImageDimension, unsigned int,
TOutputImage::ImageDimension);
/** Image typedef support. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(DerivativeImageFilter, ImageToImageFilter);
/** The output pixel type must be signed. */
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(SignedOutputPixelType,
(Concept::Signed<OutputPixelType>));
/** End concept checking */
#endif
/** Standard get/set macros for filter parameters. */
itkSetMacro(Order, unsigned int);
itkGetMacro(Order, unsigned int);
itkSetMacro(Direction, unsigned int);
itkGetMacro(Direction, unsigned int);
/** Use the image spacing information in calculations. Use this option if you
* want derivatives in physical space. Default is UseImageSpacingOn. */
void SetUseImageSpacingOn()
{ this->SetUseImageSpacing(true); }
/** Ignore the image spacing. Use this option if you want derivatives in
isotropic pixel space. Default is UseImageSpacingOn. */
void SetUseImageSpacingOff()
{ this->SetUseImageSpacing(false); }
/** Set/Get whether or not the filter will use the spacing of the input
image in its calculations */
itkSetMacro(UseImageSpacing, bool);
itkGetMacro(UseImageSpacing, bool);
/** DerivativeImageFilter needs a larger input requested region than
* the output requested region (larger in the direction of the
* derivative). As such, DerivativeImageFilter needs to provide an
* implementation for GenerateInputRequestedRegion() in order to
* inform the pipeline execution model.
*
* \sa ImageToImageFilter::GenerateInputRequestedRegion() */
virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);
protected:
DerivativeImageFilter()
{
m_Order = 1;
m_Direction = 0;
m_UseImageSpacing = true;
}
virtual ~DerivativeImageFilter() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** Standard pipeline method. While this class does not implement a
* ThreadedGenerateData(), its GenerateData() delegates all
* calculations to an NeighborhoodOperatorImageFilter. Since the
* NeighborhoodOperatorImageFilter is multithreaded, this filter is
* multithreaded by default. */
void GenerateData();
private:
DerivativeImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
/** The order of the derivative. */
unsigned int m_Order;
/** The direction of the derivative. */
unsigned int m_Direction;
bool m_UseImageSpacing;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkDerivativeImageFilter.txx"
#endif
#endif
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