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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 itkLevelSetDomainMapImageFilter_hxx
#define itkLevelSetDomainMapImageFilter_hxx
namespace itk
{
template <typename TInputImage, typename TOutputImage>
LevelSetDomainMapImageFilter<TInputImage, TOutputImage>::LevelSetDomainMapImageFilter()
{
this->Superclass::SetNumberOfRequiredInputs(1);
this->Superclass::SetNumberOfRequiredOutputs(1);
this->m_InputImage = nullptr;
this->m_OutputImage = nullptr;
}
template <typename TInputImage, typename TOutputImage>
auto
LevelSetDomainMapImageFilter<TInputImage, TOutputImage>::GetDomainMap() const -> const DomainMapType &
{
return this->m_DomainMap;
}
template <typename TInputImage, typename TOutputImage>
auto
LevelSetDomainMapImageFilter<TInputImage, TOutputImage>::ComputeConsistentRegion(
const InputImageRegionType & inputRegion) const -> InputImageRegionType
{
bool regionWasModified = false;
InputImageRegionType subRegion = inputRegion;
do
{
regionWasModified = false;
InputConstIteratorType iIt(this->m_InputImage, subRegion);
OutputConstIteratorType oIt(this->m_OutputImage, subRegion);
iIt.GoToBegin();
oIt.GoToBegin();
const InputImagePixelType firstCornerPixelValue = iIt.Get();
const InputImageIndexType & firstCornerIndex = iIt.GetIndex();
while (!iIt.IsAtEnd())
{
const OutputImagePixelType segmentPixel = oIt.Get();
const InputImagePixelType nextPixel = iIt.Get();
if ((nextPixel != firstCornerPixelValue) || (segmentPixel != OutputImagePixelType{}))
{
const InputImageIndexType & stopIdx = iIt.GetIndex();
InputImageSizeType sizeOfRegion;
for (unsigned int i = 0; i < ImageDimension; ++i)
{
sizeOfRegion[i] = stopIdx[i] - firstCornerIndex[i] + 1;
}
subRegion.SetSize(sizeOfRegion);
regionWasModified = true;
break;
}
++iIt;
++oIt;
}
} while (regionWasModified);
return subRegion;
}
template <typename TInputImage, typename TOutputImage>
void
LevelSetDomainMapImageFilter<TInputImage, TOutputImage>::GenerateData()
{
// Clear any prior contents.
this->m_DomainMap.clear();
this->m_InputImage = this->GetInput();
const InputImageRegionType & region = this->m_InputImage->GetLargestPossibleRegion();
const InputImageSizeType size = region.GetSize();
this->m_OutputImage = this->GetOutput();
this->m_OutputImage->SetBufferedRegion(region);
this->m_OutputImage->AllocateInitialized();
InputImageIndexType end;
for (unsigned int i = 0; i < ImageDimension; ++i)
{
end[i] = size[i] - 1;
}
IdentifierType segmentId = NumericTraits<IdentifierType>::OneValue();
InputConstIteratorType iIt(this->m_InputImage, region);
OutputIndexIteratorType oIt(this->m_OutputImage, region);
iIt.GoToBegin();
oIt.GoToBegin();
while (!iIt.IsAtEnd())
{
const InputImageIndexType & startIdx = iIt.GetIndex();
InputImageIndexType stopIdx = startIdx;
const InputImagePixelType & inputPixel = iIt.Get();
const OutputImagePixelType & outputPixel = oIt.Get();
// outputPixel is null when it has not been processed yet,
// or there is nothing to be processed
if ((!inputPixel.empty()) && (outputPixel == OutputImagePixelType{}))
{
InputImageRegionType subRegion;
InputImageSizeType sizeOfRegion;
for (unsigned int i = 0; i < ImageDimension; ++i)
{
bool sameOverlappingLevelSetIds = true;
stopIdx = startIdx;
while ((sameOverlappingLevelSetIds) && (stopIdx[i] <= end[i]))
{
const InputImagePixelType & nextPixel = this->m_InputImage->GetPixel(stopIdx);
const OutputImagePixelType & currentOutputPixel = this->m_OutputImage->GetPixel(stopIdx);
// Check if the input list pixels are different, or
// the output image already has been assigned to another region
if ((nextPixel != inputPixel) || (currentOutputPixel != OutputImagePixelType{}))
{
sameOverlappingLevelSetIds = false;
}
else
{
++stopIdx[i];
}
}
sizeOfRegion[i] = stopIdx[i] - startIdx[i];
}
subRegion.SetSize(sizeOfRegion);
subRegion.SetIndex(startIdx);
// Compute the consistent subregion
subRegion = this->ComputeConsistentRegion(subRegion);
this->m_DomainMap[segmentId] = LevelSetDomain(subRegion, inputPixel);
OutputIndexIteratorType ooIt(this->m_OutputImage, subRegion);
ooIt.GoToBegin();
while (!ooIt.IsAtEnd())
{
ooIt.Set(segmentId);
++ooIt;
}
++segmentId;
}
++iIt;
++oIt;
}
}
template <typename TInputImage, typename TOutputImage>
void
LevelSetDomainMapImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "DomainMap size: " << this->m_DomainMap.size() << std::endl;
}
} /* end namespace itk */
#endif
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