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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 itkVectorLinearInterpolateNearestNeighborExtrapolateImageFunction_h
#define itkVectorLinearInterpolateNearestNeighborExtrapolateImageFunction_h
#include "itkVectorInterpolateImageFunction.h"
namespace itk
{
/**
* \class VectorLinearInterpolateNearestNeighborExtrapolateImageFunction
* \brief Linearly interpolate or NN extrapolate a vector image at
* specified positions.
*
* VectorLinearInterpolateNearestNeighborExtrapolateImageFunction
* linearly interpolates (or NN extrapolates) a vector
* image intensity non-integer pixel position. This class is templated
* over the input image type and the coordinate representation type.
*
* This class is designed to work as a VectorInterpolateImageFunction,
* hence the IsInsideBuffer(PointType p) is overridden to always
* answer true
*
* This function works for N-dimensional images.
*
* \author Tom Vercauteren, INRIA & Mauna Kea Technologies
*
* \warning This function work only for Vector images. For
* scalar images use LinearInterpolateImageFunction.
*
* This paper was contributed in the Insight Journal paper:
* https://www.insight-journal.org/browse/publication/154
*
* \ingroup ImageFunctions ImageInterpolators
* \ingroup ITKImageFunction
*
*/
template <typename TInputImage, typename TCoordRep = float>
class ITK_TEMPLATE_EXPORT VectorLinearInterpolateNearestNeighborExtrapolateImageFunction
: public VectorInterpolateImageFunction<TInputImage, TCoordRep>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(VectorLinearInterpolateNearestNeighborExtrapolateImageFunction);
/** Standard class type aliases. */
using Self = VectorLinearInterpolateNearestNeighborExtrapolateImageFunction;
using Superclass = VectorInterpolateImageFunction<TInputImage, TCoordRep>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(VectorLinearInterpolateNearestNeighborExtrapolateImageFunction);
/** InputImageType type alias support */
using typename Superclass::InputImageType;
using typename Superclass::PixelType;
using typename Superclass::ValueType;
using typename Superclass::RealType;
using typename Superclass::PointType;
/** Grab the vector dimension from the superclass. */
// static constexpr unsigned int Dimension = // Superclass::Dimension;
/** Dimension underlying input image. */
static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
/** Index type alias support */
using typename Superclass::IndexType;
using typename Superclass::IndexValueType;
/** ContinuousIndex type alias support */
using typename Superclass::ContinuousIndexType;
/** Output type is Vector<double,Dimension> */
using typename Superclass::OutputType;
/** Should check if an index is inside the image buffer, however we
* require that it answers true to use the extrapolation possibility. */
bool
IsInsideBuffer(const IndexType &) const override
{
return true;
}
/** Should check if a point is inside the image buffer, however we
* require that it answers true to use the extrapolation possibility. */
bool
IsInsideBuffer(const PointType &) const override
{
return true;
}
/** Should check if a continuous index is inside the image buffer, however we
* require that it answers true to use the extrapolation possibility. */
bool
IsInsideBuffer(const ContinuousIndexType &) const override
{
return true;
}
/** Evaluate the function at a ContinuousIndex position
*
* Returns the linearly interpolated image intensity at a
* specified point position. If the point does not lie within the
* image buffer a nearest neighbor interpolation is done. */
OutputType
EvaluateAtContinuousIndex(const ContinuousIndexType & index) const override;
/** Evaluate the function at an index position
*
* Simply returns the image value at the
* specified index position. If the index does not lie within the
* image buffer a nearest neighbor interpolation is done. */
OutputType
EvaluateAtIndex(const IndexType & index) const override;
protected:
VectorLinearInterpolateNearestNeighborExtrapolateImageFunction() = default;
~VectorLinearInterpolateNearestNeighborExtrapolateImageFunction() override = default;
private:
/** Number of neighbors used in the interpolation */
static const unsigned int m_Neighbors;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkVectorLinearInterpolateNearestNeighborExtrapolateImageFunction.hxx"
#endif
#endif
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