itkKdTreeGenerator.h

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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 itkKdTreeGenerator_h
#define itkKdTreeGenerator_h
 
#include <vector>
 
#include "itkKdTree.h"
#include "itkStatisticsAlgorithm.h"
 
namespace itk::Statistics
{
 
template <typename TSample>
class ITK_TEMPLATE_EXPORT KdTreeGenerator : public Object
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(KdTreeGenerator);

  using Self = KdTreeGenerator;
  using Superclass = Object;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkOverrideGetNameOfClassMacro(KdTreeGenerator);

  itkNewMacro(Self);

  using MeasurementVectorType = typename TSample::MeasurementVectorType;
  using MeasurementType = typename TSample::MeasurementType;

  using MeasurementVectorSizeType = unsigned int;

  using KdTreeType = KdTree<TSample>;

  using OutputType = KdTreeType;

  using OutputPointer = typename KdTreeType::Pointer;

  using KdTreeNodeType = typename KdTreeType::KdTreeNodeType;

  using SubsampleType = Subsample<TSample>;

  using SubsamplePointer = typename SubsampleType::Pointer;

  void
  SetSample(TSample * sample);
  itkGetConstMacro(SourceSample, TSample *);
  void
  SetBucketSize(unsigned int size);
  itkGetConstMacro(BucketSize, unsigned int);
  OutputPointer
  GetOutput()
  {
    return m_Tree;
  }

  void
  Update()
  {
    this->GenerateData();
  }

  void
  GenerateData();

  itkGetConstMacro(MeasurementVectorSize, unsigned int);
 
protected:
  KdTreeGenerator();

  ~KdTreeGenerator() override = default;
 
  void
  PrintSelf(std::ostream & os, Indent indent) const override;

  SubsamplePointer
  GetSubsample()
  {
    return m_Subsample;
  }

  virtual KdTreeNodeType *
  GenerateNonterminalNode(unsigned int            beginIndex,
                          unsigned int            endIndex,
                          MeasurementVectorType & lowerBound,
                          MeasurementVectorType & upperBound,
                          unsigned int            level);

  KdTreeNodeType *
  GenerateTreeLoop(unsigned int            beginIndex,
                   unsigned int            endIndex,
                   MeasurementVectorType & lowerBound,
                   MeasurementVectorType & upperBound,
                   unsigned int            level);
 
private:
  TSample * m_SourceSample{};

  SubsamplePointer m_Subsample{};

  unsigned int m_BucketSize{};

  OutputPointer m_Tree{};

  MeasurementVectorType m_TempLowerBound{};

  MeasurementVectorType m_TempUpperBound{};

  MeasurementVectorType m_TempMean{};

  MeasurementVectorSizeType m_MeasurementVectorSize{};
}; // end of class
} // namespace itk::Statistics
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkKdTreeGenerator.hxx"
#endif
 
#endif