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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 itkLabelImageGenericInterpolateImageFunction_h
#define itkLabelImageGenericInterpolateImageFunction_h
#include <itkInterpolateImageFunction.h>
#include "itkLabelSelectionImageAdaptor.h"
#include <vector>
#include <set>
namespace itk
{
/** \class LabelImageGenericInterpolateImageFunction
* \brief Interpolation function for multi-label images that implicitly interpolates each
* unique value in the image corresponding to each label set element and returns the
* corresponding label set element with the largest weight.
*
* This filter is an alternative to nearest neighbor interpolation for multi-label
* images. It can use almost any underlying interpolator.
* * \ingroup ITKImageFunction
* * \ingroup GenericLabelInterpolator
*/
template <typename TInputImage, template <typename, typename> class TInterpolator, typename TCoordRep = double>
class ITK_EXPORT LabelImageGenericInterpolateImageFunction : public InterpolateImageFunction<TInputImage, TCoordRep>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(LabelImageGenericInterpolateImageFunction);
/** Standard class type alias. */
using Self = LabelImageGenericInterpolateImageFunction;
using Superclass = InterpolateImageFunction<TInputImage, TCoordRep>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using InputPixelType = typename TInputImage::PixelType;
/** Run-time type information (and related methods). */
itkTypeMacro(LabelImageGenericInterpolateImageFunction, InterpolateImageFunction);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** ImageDimension constant */
static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
/** OutputType type alias support. */
using OutputType = typename Superclass::OutputType;
/** InputImageType type alias support. */
using InputImageType = typename Superclass::InputImageType;
/** RealType type alias support. */
using RealType = typename Superclass::RealType;
/** Index type alias support. */
using IndexType = typename Superclass::IndexType;
/** Size type alias support. */
using SizeType = typename Superclass::SizeType;
/** ContinuousIndex type alias support. */
using ContinuousIndexType = typename Superclass::ContinuousIndexType;
using LabelSelectionAdaptorType = LabelSelectionImageAdaptor<TInputImage, double>;
// The interpolator used for individual binary masks corresponding to each label
using InternalInterpolatorType = TInterpolator<LabelSelectionAdaptorType, TCoordRep>;
/**
* Evaluate at the given index
*/
OutputType
EvaluateAtContinuousIndex(const ContinuousIndexType & cindex) const override
{
return this->EvaluateAtContinuousIndex(cindex, nullptr);
}
void
SetInputImage(const TInputImage * image) override;
/** Get the radius required for interpolation.
*
* This defines the number of surrounding pixels required to interpolate at
* a given point.
*/
SizeType
GetRadius() const override
{
return SizeType::Filled(1);
}
protected:
LabelImageGenericInterpolateImageFunction() = default;
~LabelImageGenericInterpolateImageFunction() override = default;
std::vector<typename InternalInterpolatorType::Pointer> m_InternalInterpolators;
std::vector<typename LabelSelectionAdaptorType::Pointer> m_LabelSelectionAdaptors;
using LabelSetType = std::set<typename TInputImage::PixelType>;
LabelSetType m_Labels;
private:
/**
* Evaluate function value at the given index
*/
virtual OutputType
EvaluateAtContinuousIndex(const ContinuousIndexType &, OutputType *) const;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkLabelImageGenericInterpolateImageFunction.hxx"
#endif
#endif
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