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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 itkAttributeKeepNObjectsLabelMapFilter_hxx
#define itkAttributeKeepNObjectsLabelMapFilter_hxx
#include "itkProgressReporter.h"
namespace itk
{
template <typename TImage, typename TAttributeAccessor>
AttributeKeepNObjectsLabelMapFilter<TImage, TAttributeAccessor>::AttributeKeepNObjectsLabelMapFilter()
{
m_ReverseOrdering = false;
m_NumberOfObjects = 1;
// create the output image for the removed objects
this->SetNumberOfRequiredOutputs(2);
this->SetNthOutput(1, static_cast<TImage *>(this->MakeOutput(1).GetPointer()));
}
template <typename TImage, typename TAttributeAccessor>
void
AttributeKeepNObjectsLabelMapFilter<TImage, TAttributeAccessor>::GenerateData()
{
// Allocate the output
this->AllocateOutputs();
ImageType * output = this->GetOutput();
ImageType * output2 = this->GetOutput(1);
// set the background value for the second output - this is not done in the superclasses
output2->SetBackgroundValue(output->GetBackgroundValue());
ProgressReporter progress(this, 0, 2 * output->GetNumberOfLabelObjects());
// get the label objects in a vector, so they can be sorted
using VectorType = typename std::vector<typename LabelObjectType::Pointer>;
VectorType labelObjects;
labelObjects.reserve(output->GetNumberOfLabelObjects());
for (typename ImageType::Iterator it(output); !it.IsAtEnd(); ++it)
{
labelObjects.push_back(it.GetLabelObject());
progress.CompletedPixel();
}
// instantiate the comparator and sort the vector
if (m_NumberOfObjects < output->GetNumberOfLabelObjects())
{
auto end = labelObjects.begin() + m_NumberOfObjects;
if (m_ReverseOrdering)
{
ReverseComparator comparator;
std::nth_element(labelObjects.begin(), end, labelObjects.end(), comparator);
}
else
{
Comparator comparator;
std::nth_element(labelObjects.begin(), end, labelObjects.end(), comparator);
}
// progress.CompletedPixel();
// and move the last objects to the second output
for (typename VectorType::const_iterator it = end; it != labelObjects.end(); ++it)
{
output->RemoveLabelObject(*it);
output2->AddLabelObject(*it);
progress.CompletedPixel();
}
}
}
template <typename TImage, typename TAttributeAccessor>
void
AttributeKeepNObjectsLabelMapFilter<TImage, TAttributeAccessor>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "ReverseOrdering: " << m_ReverseOrdering << std::endl;
os << indent << "NumberOfObjects: " << m_NumberOfObjects << std::endl;
}
} // end namespace itk
#endif
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