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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 itkKernelImageFilter_h
#define itkKernelImageFilter_h
#include "itkBoxImageFilter.h"
namespace itk
{
template <unsigned int VDimension>
class FlatStructuringElement;
/**
* \class KernelImageFilter
* \brief A base class for all the filters working on an arbitrary shaped neighborhood
*
* This filter provides the code to store the radius information about the
* neighborhood used in the subclasses.
*
* \author Gaetan Lehmann
* \ingroup ITKImageFilterBase
*/
template< typename TInputImage, typename TOutputImage, typename TKernel /*=Neighborhood<bool,
TInputImage::ImageDimension>*/ >
class ITK_TEMPLATE_EXPORT KernelImageFilter:
public BoxImageFilter< TInputImage, TOutputImage >
{
public:
ITK_DISALLOW_COPY_AND_MOVE(KernelImageFilter);
/** Standard class type aliases. */
using Self = KernelImageFilter;
using Superclass = BoxImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Standard New method. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(KernelImageFilter);
/** Image related type alias. */
using InputImageType = TInputImage;
using RegionType = typename TInputImage::RegionType;
using SizeType = typename TInputImage::SizeType;
using IndexType = typename TInputImage::IndexType;
using OffsetType = typename TInputImage::OffsetType;
using InputPixelType = typename TInputImage::PixelType;
using OutputImageType = TOutputImage;
using OutputPixelType = typename TOutputImage::PixelType;
using KernelType = TKernel;
/** Image related type alias. */
static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
/** Kernel type used to create box kernel, in SetRadius() method */
using FlatKernelType = FlatStructuringElement<(Self::ImageDimension)>;
/** n-dimensional Kernel radius. */
using RadiusType = typename TInputImage::SizeType;
/** Set kernel (structuring element). */
virtual void
SetKernel(const KernelType & kernel);
itkGetConstReferenceMacro(Kernel, KernelType);
/** Set the kernel to a box kernel of given radius. */
void
SetRadius(const RadiusType & radius) override;
void
SetRadius(const SizeValueType & radius) override
{
// needed because of the overloading of the method
Superclass::SetRadius(radius);
}
protected:
KernelImageFilter();
~KernelImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** kernel or structuring element to use. */
KernelType m_Kernel{};
private:
template <typename T>
void
MakeKernel(const RadiusType & radius, T & kernel)
{
kernel.SetRadius(radius);
for (typename T::Iterator kit = kernel.Begin(); kit != kernel.End(); ++kit)
{
*kit = 1;
}
}
void
MakeKernel(const RadiusType & radius, FlatKernelType & kernel)
{
// set up a decomposable box structuring element which is
// much efficient with van Herk / Gil Werman filters
kernel = FlatKernelType::Box(radius);
assert(kernel.GetDecomposable());
}
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkKernelImageFilter.hxx"
#endif
#endif
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