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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 itkDerivativeImageFilter_h
#define itkDerivativeImageFilter_h
#include "itkImageToImageFilter.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
* \ingroup ITKImageFeature
*
* \wiki
* \wikiexample{EdgesAndGradients/DerivativeImageFilter,Compute the derivative of an image in a particular direction}
* \endwiki
*/
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_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);
itkGetConstMacro(Order, unsigned int);
itkSetMacro(Direction, unsigned int);
itkGetConstMacro(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);
itkGetConstMacro(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() ITK_OVERRIDE;
protected:
DerivativeImageFilter()
{
m_Order = 1;
m_Direction = 0;
m_UseImageSpacing = true;
}
virtual ~DerivativeImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** 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() ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(DerivativeImageFilter);
/** 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.hxx"
#endif
#endif
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