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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkSobelEdgeDetectionImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-23 22:36:00 $
Version: $Revision: 1.12 $
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 __itkSobelEdgeDetectionImageFilter_h
#define __itkSobelEdgeDetectionImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkImage.h"
namespace itk
{
/**
* \class SobelEdgeDetectionImageFilter
* \brief A 2D or 3D edge detection using the Sobel operator.
*
* This filter uses the Sobel operator to calculate the image gradient and then
* finds the magnitude of this gradient vector. The Sobel gradient magnitude
* (square-root sum of squares) is an indication of edge strength.
*
* \sa ImageToImageFilter
* \sa SobelOperator
* \sa Neighborhood
* \sa NeighborhoodOperator
* \sa NeighborhoodIterator
*
* \ingroup ImageFeatureExtraction
*
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT SobelEdgeDetectionImageFilter :
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/**
* Standard "Self" & Superclass typedef.
*/
typedef SobelEdgeDetectionImageFilter Self;
typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
/**
* 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;
itkStaticConstMacro(ImageDimension, unsigned int,
TOutputImage::ImageDimension );
itkStaticConstMacro(InputImageDimension, unsigned int,
TInputImage::ImageDimension );
/**
* Image typedef support
*/
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef typename InputImageType::Pointer InputImagePointer;
/**
* Smart pointer typedef support
*/
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/**
* Run-time type information (and related methods)
*/
itkTypeMacro(SobelEdgeDetectionImageFilter, ImageToImageFilter);
/**
* Method for creation through the object factory.
*/
itkNewMacro(Self);
/**
* SobelEdgeDetectionImageFilter needs a larger input requested region than
* the output requested region (larger in the direction of the
* derivative). As such, SobelEdgeDetectionImageFilter needs to provide an
* implementation for GenerateInputRequestedRegion() in order to
* inform the pipeline execution model.
*
* \sa ImageToImageFilter::GenerateInputRequestedRegion()
*/
virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(SameDimensionCheck,
(Concept::SameDimension<InputImageDimension, ImageDimension>));
itkConceptMacro(OutputHasNumericTraitsCheck,
(Concept::HasNumericTraits<OutputPixelType>));
#ifdef ITK_USE_STRICT_CONCEPT_CHECKING
itkConceptMacro(OutputPixelIsFloatingPointCheck,
(Concept::IsFloatingPoint<OutputPixelType>));
#endif
/** End concept checking */
#endif
protected:
SobelEdgeDetectionImageFilter() {}
virtual ~SobelEdgeDetectionImageFilter() {}
SobelEdgeDetectionImageFilter(const Self&) {}
//void operator=(const Self&) {}
/**
* 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();
void PrintSelf(std::ostream& os, Indent indent) const
{ Superclass::PrintSelf(os,indent); }
private:
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkSobelEdgeDetectionImageFilter.txx"
#endif
#endif
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