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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 itkZeroFluxNeumannPadImageFilter_h
#define itkZeroFluxNeumannPadImageFilter_h
#include "itkPadImageFilter.h"
#include "itkZeroFluxNeumannBoundaryCondition.h"
namespace itk
{
/**
* \class ZeroFluxNeumannPadImageFilter
* \brief Increase the image size by padding according to the
* zero-flux Neumann boundary condition.
*
* A filter which extends the image size and fill the missing pixels
* according to a Neumann boundary condition where first,
* upwind derivatives on the boundary are zero. This is a useful condition
* in solving some classes of differential equations.
*
* For example, invoking this filter on an image with a corner like:
\code
* * * * * * *
* * * * * * *
* * 1 2 3 4 5 (where * denotes pixels that lie
* * 3 3 5 5 6 outside of the image boundary)
* * 4 4 6 7 8
\endcode
* returns the following padded image:
\code
1 1 1 2 3 4 5
1 1 1 2 3 4 5
1 1 1 2 3 4 5
3 3 3 3 5 5 6 (note the corner values)
4 4 4 4 6 7 8
\endcode
*
* \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
*
* \ingroup GeometricTransform
* \ingroup ITKImageGrid
* \sa WrapPadImageFilter, MirrorPadImageFilter, ConstantPadImageFilter, ZeroFluxNeumannBoundaryCondition
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT ZeroFluxNeumannPadImageFilter : public PadImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ZeroFluxNeumannPadImageFilter);
/** Standard class type aliases. */
using Self = ZeroFluxNeumannPadImageFilter;
using Superclass = PadImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(ZeroFluxNeumannPadImageFilter);
/** Typedef to describe the output image region type. */
using typename Superclass::OutputImageRegionType;
using typename Superclass::InputImageRegionType;
using RegionType = typename Superclass::InputImageRegionType;
/** Typedef to describe the type of pixel. */
using typename Superclass::OutputImagePixelType;
using typename Superclass::InputImagePixelType;
/** Typedef to describe the output and input image index and size types. */
using typename Superclass::OutputImageIndexType;
using typename Superclass::InputImageIndexType;
using typename Superclass::OutputImageSizeType;
using typename Superclass::InputImageSizeType;
using IndexType = typename Superclass::InputImageIndexType;
using SizeType = typename Superclass::InputImageSizeType;
/** ImageDimension constants */
static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
static constexpr unsigned int OutputImageDimension = TOutputImage::ImageDimension;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro(OutputEqualityComparableCheck, (Concept::EqualityComparable<OutputImagePixelType>));
itkConceptMacro(InputConvertibleToOutputCheck, (Concept::Convertible<InputImagePixelType, OutputImagePixelType>));
itkConceptMacro(SameDimensionCheck, (Concept::SameDimension<ImageDimension, OutputImageDimension>));
itkConceptMacro(OutputOStreamWritableCheck, (Concept::OStreamWritable<OutputImagePixelType>));
// End concept checking
#endif
protected:
ZeroFluxNeumannPadImageFilter();
~ZeroFluxNeumannPadImageFilter() override = default;
private:
ZeroFluxNeumannBoundaryCondition<TInputImage, TOutputImage> m_InternalBoundaryCondition{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkZeroFluxNeumannPadImageFilter.hxx"
#endif
#endif
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