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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 itkMedianImageFunction_hxx
#define itkMedianImageFunction_hxx
#include "itkImage.h"
#include "itkShapedImageNeighborhoodRange.h"
#include <vector>
#include <algorithm>
namespace itk
{
template <typename TInputImage, typename TCoordRep>
MedianImageFunction<TInputImage, TCoordRep>::MedianImageFunction() = default;
template <typename TInputImage, typename TCoordRep>
void
MedianImageFunction<TInputImage, TCoordRep>::SetNeighborhoodRadius(const unsigned int radius)
{
if (m_NeighborhoodRadius != radius)
{
m_NeighborhoodOffsets = GenerateRectangularImageNeighborhoodOffsets(ImageSizeType::Filled(radius));
m_NeighborhoodRadius = radius;
this->Modified();
}
}
template <typename TInputImage, typename TCoordRep>
void
MedianImageFunction<TInputImage, TCoordRep>::PrintSelf(std::ostream & os, Indent indent) const
{
this->Superclass::PrintSelf(os, indent);
os << indent << "NeighborhoodRadius: " << m_NeighborhoodRadius << std::endl;
}
template <typename TInputImage, typename TCoordRep>
auto
MedianImageFunction<TInputImage, TCoordRep>::EvaluateAtIndex(const IndexType & index) const -> OutputType
{
const InputImageType * const image = this->GetInputImage();
if (image == nullptr)
{
return (NumericTraits<OutputType>::max());
}
if (!this->IsInsideBuffer(index))
{
return (NumericTraits<OutputType>::max());
}
const ShapedImageNeighborhoodRange<const InputImageType> neighborhoodRange(*image, index, m_NeighborhoodOffsets);
// We have to copy the pixels so we can run std::nth_element.
std::vector<InputPixelType> pixels(neighborhoodRange.cbegin(), neighborhoodRange.cend());
// Get the median value
const auto medianIterator = pixels.begin() + (pixels.size() / 2);
std::nth_element(pixels.begin(), medianIterator, pixels.end());
return (*medianIterator);
}
} // namespace itk
#endif
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