Method MergeLabels

Modules/Multilabel/src/mitkLabelSetImage.cpp:782–840

}

void mitk::MultiLabelSegmentation::MergeLabels(LabelValueType targetLabelValue, const LabelValueVectorType& sourceLabelValues,
  OverwriteStyle overwriteStyle)
{
  for (const auto& value : sourceLabelValues)
  {
    if (!this->ExistLabel(value)) mitkThrow() << "Cannot merge label. Source label value (" << value << ") does not exist.";
  }

  if (!this->ExistLabel(targetLabelValue)) mitkThrow() << "Cannot merge label. Target label value (" << targetLabelValue << ") does not exist.";

  auto targetGroupID = this->GetGroupIndexOfLabel(targetLabelValue);
  auto sourceGroupMapping = LabelSetImageHelper::SplitLabelValuesByGroup(this, sourceLabelValues);

  ////////////////////////////////////////
  //prepare label information for transfer
  auto targetGroupLabelValues = this->GetLabelValuesByGroup(targetGroupID);

  //remove all source labels, if they are in labels, because we want to ensure that these are not locked for the transfer
  auto isSourceValueCheckLambda = [&](LabelValueType x)
    { return std::find(sourceLabelValues.begin(), sourceLabelValues.end(), x) != sourceLabelValues.end(); };
  targetGroupLabelValues.erase(std::remove_if(targetGroupLabelValues.begin(), targetGroupLabelValues.end(), isSourceValueCheckLambda),
    targetGroupLabelValues.end());

  auto labels = this->GetConstLabelsByValue(targetGroupLabelValues);
  for (const auto value : sourceLabelValues)
  {
    auto unlockedSourceLabel = this->GetLabel(value)->Clone();
    unlockedSourceLabel->SetLocked(false);
    labels.push_back(unlockedSourceLabel);
  }

  ////////////////////////////////////////////////////////////////////
  //iterate through all relevant source groups and merge there content
  for (const auto& [sourceGroupID, relevantSourceLabelValues] : sourceGroupMapping)
  {
    LabelValueMappingVector mapping;
    for (const auto value : relevantSourceLabelValues)
    {
      mapping.emplace_back(value, targetLabelValue);
    }

    //do the merge as a transfer operation
    mitk::TransferLabelContent(this->GetGroupImage(sourceGroupID), this->GetGroupImage(targetGroupID), labels,
      mitk::MultiLabelSegmentation::UNLABELED_VALUE, mitk::MultiLabelSegmentation::UNLABELED_VALUE, false, mapping,
      MergeStyle::Merge, overwriteStyle);
  }

  this->InvokeEvent(LabelModifiedEvent(targetLabelValue));
  for (const auto value : sourceLabelValues)
  {
    this->InvokeEvent(LabelModifiedEvent(value));
  }

  auto modifiedValues = sourceLabelValues;
  modifiedValues.push_back(targetLabelValue);
  this->InvokeEvent(LabelsChangedEvent(modifiedValues));

  Modified();