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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 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
*
* \ingroup ITKImageFeature
*
* \wiki
* \wikiexample{EdgesAndGradients/SobelEdgeDetectionImageFilter,SobelEdgeDetectionImageFilter}
* \endwiki
*/
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_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() ITK_OVERRIDE;
#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() 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;
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE
{
Superclass::PrintSelf(os, indent);
}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(SobelEdgeDetectionImageFilter);
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkSobelEdgeDetectionImageFilter.hxx"
#endif
#endif
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