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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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
*
* \sphinx
* \sphinxexample{Filtering/ImageFeature/SobelEdgeDetectionImageFilter,Sobel Edge Detection Image Filter}
* \endsphinx
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT SobelEdgeDetectionImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(SobelEdgeDetectionImageFilter);
/**
* Standard "Self" & Superclass type alias.
*/
using Self = SobelEdgeDetectionImageFilter;
using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
/**
* Extract some information from the image types. Dimensionality
* of the two images is assumed to be the same.
*/
using OutputPixelType = typename TOutputImage::PixelType;
using OutputInternalPixelType = typename TOutputImage::InternalPixelType;
using InputPixelType = typename TInputImage::PixelType;
using InputInternalPixelType = typename TInputImage::InternalPixelType;
static constexpr unsigned int ImageDimension = TOutputImage::ImageDimension;
static constexpr unsigned int InputImageDimension = TInputImage::ImageDimension;
/**
* Image type alias support
*/
using InputImageType = TInputImage;
using OutputImageType = TOutputImage;
using InputImagePointer = typename InputImageType::Pointer;
/**
* Smart pointer type alias support
*/
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/**
* Run-time type information (and related methods)
*/
itkOverrideGetNameOfClassMacro(SobelEdgeDetectionImageFilter);
/**
* 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()
*/
void
GenerateInputRequestedRegion() override;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(SameDimensionCheck, (Concept::SameDimension<InputImageDimension, ImageDimension>));
itkConceptMacro(OutputHasNumericTraitsCheck, (Concept::HasNumericTraits<OutputPixelType>));
itkConceptMacro(OutputPixelIsFloatingPointCheck, (Concept::IsFloatingPoint<OutputPixelType>));
// End concept checking
#endif
protected:
SobelEdgeDetectionImageFilter() = default;
~SobelEdgeDetectionImageFilter() override = default;
/**
* 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() override;
void
PrintSelf(std::ostream & os, Indent indent) const override
{
Superclass::PrintSelf(os, indent);
}
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkSobelEdgeDetectionImageFilter.hxx"
#endif
#endif
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