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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 itkNearestNeighborInterpolateImageFunction_h
#define itkNearestNeighborInterpolateImageFunction_h
#include "itkInterpolateImageFunction.h"
namespace itk
{
/**
* \class NearestNeighborInterpolateImageFunction
* \brief Nearest neighbor interpolation of a scalar image.
*
* NearestNeighborInterpolateImageFunction interpolates image intensity at
* a non-integer pixel position by copying the intensity for the nearest
* neighbor. This class is templated
* over the input image type and the coordinate representation type
* (e.g. float or double).
*
* \ingroup ImageFunctions ImageInterpolators
* \ingroup ITKImageFunction
*/
template <typename TInputImage, typename TCoordRep = double>
class ITK_TEMPLATE_EXPORT NearestNeighborInterpolateImageFunction
: public InterpolateImageFunction<TInputImage, TCoordRep>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(NearestNeighborInterpolateImageFunction);
/** Standard class type aliases. */
using Self = NearestNeighborInterpolateImageFunction;
using Superclass = InterpolateImageFunction<TInputImage, TCoordRep>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(NearestNeighborInterpolateImageFunction);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** OutputType type alias support */
using typename Superclass::OutputType;
/** InputImageType type alias support */
using typename Superclass::InputImageType;
/** Dimension underlying input image. */
static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
/** Index type alias support */
using typename Superclass::IndexType;
/** Size type alias support */
using typename Superclass::SizeType;
/** ContinuousIndex type alias support */
using typename Superclass::ContinuousIndexType;
/** Evaluate the function at a ContinuousIndex position
*
* Returns the interpolated image intensity at a
* specified point position. No bounds checking is done.
* The point is assume to lie within the image buffer.
*
* ImageFunction::IsInsideBuffer() can be used to check bounds before
* calling the method. */
OutputType
EvaluateAtContinuousIndex(const ContinuousIndexType & index) const override
{
IndexType nindex;
this->ConvertContinuousIndexToNearestIndex(index, nindex);
return static_cast<OutputType>(this->GetInputImage()->GetPixel(nindex));
}
SizeType
GetRadius() const override
{
return SizeType(); // zeroes by default
}
protected:
NearestNeighborInterpolateImageFunction() = default;
~NearestNeighborInterpolateImageFunction() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override
{
Superclass::PrintSelf(os, indent);
}
};
} // end namespace itk
#endif
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