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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 itkChangeLabelLabelMapFilter_hxx
#define itkChangeLabelLabelMapFilter_hxx
#include "itkProgressReporter.h"
#include <deque>
namespace itk
{
template <typename TImage>
void
ChangeLabelLabelMapFilter<TImage>::SetChangeMap(const ChangeMapType & changeMap)
{
if (m_MapOfLabelToBeReplaced != changeMap)
{
m_MapOfLabelToBeReplaced = changeMap;
this->Modified();
}
}
template <typename TImage>
auto
ChangeLabelLabelMapFilter<TImage>::GetChangeMap() const -> const ChangeMapType &
{
return m_MapOfLabelToBeReplaced;
}
template <typename TImage>
void
ChangeLabelLabelMapFilter<TImage>::SetChange(const PixelType & oldLabel, const PixelType & newLabel)
{
if (m_MapOfLabelToBeReplaced.find(oldLabel) == m_MapOfLabelToBeReplaced.end() ||
m_MapOfLabelToBeReplaced[oldLabel] != newLabel)
{
m_MapOfLabelToBeReplaced[oldLabel] = newLabel;
this->Modified();
}
}
template <typename TImage>
void
ChangeLabelLabelMapFilter<TImage>::ClearChangeMap()
{
if (!m_MapOfLabelToBeReplaced.empty())
{
m_MapOfLabelToBeReplaced.clear();
this->Modified();
}
}
template <typename TImage>
void
ChangeLabelLabelMapFilter<TImage>::GenerateData()
{
// MoveLabelsToTemporaryArray
// Allocate the output
this->AllocateOutputs();
ImageType * output = this->GetOutput();
// Report the progress
ProgressReporter progress(this, 0, static_cast<SizeValueType>(m_MapOfLabelToBeReplaced.size()) * 2);
// First remove the ones to change and store them elsewhere to process later
using LabelObjectPointer = typename LabelObjectType::Pointer;
using VectorType = std::deque<LabelObjectPointer>;
VectorType labelObjectsToBeRelabeled;
ChangeMapIterator pairToReplace = m_MapOfLabelToBeReplaced.begin();
while (pairToReplace != m_MapOfLabelToBeReplaced.end())
{
const PixelType labelToBeReplaced = pairToReplace->first;
if (labelToBeReplaced != output->GetBackgroundValue())
{
if (output->HasLabel(labelToBeReplaced))
{
labelObjectsToBeRelabeled.push_back(output->GetLabelObject(labelToBeReplaced));
output->RemoveLabel(labelToBeReplaced);
}
}
progress.CompletedPixel();
++pairToReplace;
}
// ChangeBackgroundIfNeeded
// Check if the background is among the list of labels to relabel.
ChangeMapIterator backgroundLabelItr = m_MapOfLabelToBeReplaced.find(output->GetBackgroundValue());
const bool backgroundLabelMustBeReplaced = (backgroundLabelItr != m_MapOfLabelToBeReplaced.end());
// Then change the label of the background if needed
if (backgroundLabelMustBeReplaced)
{
const PixelType newLabelForBackground = m_MapOfLabelToBeReplaced[output->GetBackgroundValue()];
if (newLabelForBackground != output->GetBackgroundValue())
{
if (output->HasLabel(newLabelForBackground))
{
// we must have a background - remove that object
output->RemoveLabel(newLabelForBackground);
}
output->SetBackgroundValue(newLabelForBackground);
}
}
// RestoreLabelObjectsAndChangeLabels
// Put the objects back in the map, with the updated label
auto labelObjectItr = labelObjectsToBeRelabeled.begin();
while (labelObjectItr != labelObjectsToBeRelabeled.end())
{
LabelObjectType * labelObjectSource = *labelObjectItr;
PixelType newLabel = m_MapOfLabelToBeReplaced[labelObjectSource->GetLabel()];
// Ignore the label if it is the background
if (newLabel != output->GetBackgroundValue())
{
// If the new label already exists in the output, then merge them.
if (output->HasLabel(newLabel))
{
// Add the content of the label object to the one already there
LabelObjectType * labelObjectDestination = output->GetLabelObject(newLabel);
typename LabelObjectType::ConstLineIterator lit(labelObjectSource);
while (!lit.IsAtEnd())
{
labelObjectDestination->AddLine(lit.GetLine());
++lit;
}
// be sure to have the lines well organized
labelObjectDestination->Optimize();
}
else
{
// just put the label object in the label map with the new label
labelObjectSource->SetLabel(newLabel);
output->AddLabelObject(labelObjectSource);
}
}
// go to the next label object
progress.CompletedPixel();
++labelObjectItr;
}
}
template <typename TImage>
void
ChangeLabelLabelMapFilter<TImage>::PrintSelf(std::ostream & os, Indent indent) const
{
this->Superclass::PrintSelf(os, indent);
auto pairToReplace = m_MapOfLabelToBeReplaced.begin();
using LabelPrintType = typename NumericTraits<PixelType>::PrintType;
os << indent << "Labels to replace: " << std::endl;
while (pairToReplace != m_MapOfLabelToBeReplaced.end())
{
const PixelType oldLabel = pairToReplace->first;
const PixelType newLabel = pairToReplace->second;
os << indent;
os << static_cast<LabelPrintType>(oldLabel) << " -> ";
os << static_cast<LabelPrintType>(newLabel) << std::endl;
++pairToReplace;
}
}
} // end namespace itk
#endif
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