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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 itkInterpolateImageFilter_hxx
#define itkInterpolateImageFilter_hxx
#include "itkImageRegionIteratorWithIndex.h"
#include "itkTotalProgressReporter.h"
namespace itk
{
template <typename TInputImage, typename TOutputImage>
InterpolateImageFilter<TInputImage, TOutputImage>::InterpolateImageFilter()
{
// The filter requires two inputs
this->SetNumberOfRequiredInputs(2);
// Set default interpolator to linear
using LinearInterpolatorType = LinearInterpolateImageFunction<IntermediateImageType>;
auto interpolator = LinearInterpolatorType::New();
m_Interpolator = static_cast<InterpolatorType *>(interpolator.GetPointer());
// Set default distance to 0,5
m_Distance = 0.5;
m_IntermediateImage = nullptr;
this->DynamicMultiThreadingOn();
this->ThreaderUpdateProgressOff();
}
template <typename TInputImage, typename TOutputImage>
void
InterpolateImageFilter<TInputImage, TOutputImage>::SetInput2(const InputImageType * image)
{
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput(1, const_cast<InputImageType *>(image));
}
template <typename TInputImage, typename TOutputImage>
auto
InterpolateImageFilter<TInputImage, TOutputImage>::GetInput2() -> const InputImageType *
{
return static_cast<const TInputImage *>(this->ProcessObject::GetInput(1));
}
template <typename TInputImage, typename TOutputImage>
void
InterpolateImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
this->Superclass::PrintSelf(os, indent);
os << indent << "Interpolator: " << m_Interpolator.GetPointer() << std::endl;
os << indent << "Distance: " << m_Distance << std::endl;
}
template <typename TInputImage, typename TOutputImage>
void
InterpolateImageFilter<TInputImage, TOutputImage>::BeforeThreadedGenerateData()
{
if (!m_Interpolator)
{
itkExceptionMacro("Interpolator not set");
}
// Create intermediate image
using IntermediateImageRegionType = typename IntermediateImageType::RegionType;
using ImageRegionType = typename TOutputImage::RegionType;
ImageRegionType outputRegion = this->GetOutput()->GetRequestedRegion();
IntermediateImageRegionType intermediateRegion;
using RegionCopierType = ImageToImageFilterDetail::ImageRegionCopier<ImageDimension + 1, ImageDimension>;
RegionCopierType regionCopier;
regionCopier(intermediateRegion, outputRegion);
intermediateRegion.SetIndex(ImageDimension, 0);
intermediateRegion.SetSize(ImageDimension, 2);
m_IntermediateImage = IntermediateImageType::New();
m_IntermediateImage->SetRegions(intermediateRegion);
m_IntermediateImage->Allocate();
// Fill intermediate image
intermediateRegion.SetIndex(ImageDimension, 0);
intermediateRegion.SetSize(ImageDimension, 1);
ImageRegionConstIteratorWithIndex<TInputImage> inIter(this->GetInput1(), outputRegion);
ImageRegionIteratorWithIndex<IntermediateImageType> outIter(m_IntermediateImage, intermediateRegion);
while (!inIter.IsAtEnd())
{
outIter.Set(inIter.Get());
++inIter;
++outIter;
}
intermediateRegion.SetIndex(ImageDimension, 1);
intermediateRegion.SetSize(ImageDimension, 1);
inIter = ImageRegionConstIteratorWithIndex<TInputImage>(this->GetInput2(), outputRegion);
outIter = ImageRegionIteratorWithIndex<IntermediateImageType>(m_IntermediateImage, intermediateRegion);
while (!inIter.IsAtEnd())
{
outIter.Set(inIter.Get());
++inIter;
++outIter;
}
// Connect input image to interpolator
m_Interpolator->SetInputImage(m_IntermediateImage);
}
template <typename TInputImage, typename TOutputImage>
void
InterpolateImageFilter<TInputImage, TOutputImage>::AfterThreadedGenerateData()
{
// Clean up intermediate memory usage
m_IntermediateImage = nullptr;
}
template <typename TInputImage, typename TOutputImage>
void
InterpolateImageFilter<TInputImage, TOutputImage>::DynamicThreadedGenerateData(
const OutputImageRegionType & outputRegionForThread)
{
OutputImagePointer outputPtr = this->GetOutput();
using OutputIterator = ImageRegionIteratorWithIndex<TOutputImage>;
using OutputPixelType = typename TOutputImage::PixelType;
using IndexType = typename TOutputImage::IndexType;
using ContinuousIndexType = typename InterpolatorType::ContinuousIndexType;
IndexType outputIndex; // Index to current output pixel
ContinuousIndexType intermediateIndex; // Coordinates of current intermediate image pixel
TotalProgressReporter progress(this, outputPtr->GetRequestedRegion().GetNumberOfPixels());
// Walk the output region
for (OutputIterator outIt(outputPtr, outputRegionForThread); !outIt.IsAtEnd(); ++outIt)
{
// Determine the intermediate image index
outputIndex = outIt.GetIndex();
for (unsigned int j = 0; j < ImageDimension; ++j)
{
intermediateIndex[j] = static_cast<double>(outputIndex[j]);
}
intermediateIndex[ImageDimension] = m_Distance;
// Evaluate input at right position and copy to the output
if (m_Interpolator->IsInsideBuffer(intermediateIndex))
{
outIt.Set(static_cast<OutputPixelType>(m_Interpolator->EvaluateAtContinuousIndex(intermediateIndex)));
}
else
{
// should never be in here
itkExceptionMacro("Index not within the intermediate buffer");
}
progress.CompletedPixel();
}
}
} // end namespace itk
#endif
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