itkUniformRandomSpatialNeighborSubsampler.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.
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#ifndef itkUniformRandomSpatialNeighborSubsampler_h
#define itkUniformRandomSpatialNeighborSubsampler_h
 
#include "itkSpatialNeighborSubsampler.h"
#include "itkMersenneTwisterRandomVariateGenerator.h"
 
namespace itk::Statistics
{
 
template <typename TSample, typename TRegion>
class ITK_TEMPLATE_EXPORT UniformRandomSpatialNeighborSubsampler : public SpatialNeighborSubsampler<TSample, TRegion>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(UniformRandomSpatialNeighborSubsampler);

  using Self = UniformRandomSpatialNeighborSubsampler<TSample, TRegion>;
  using Superclass = SpatialNeighborSubsampler<TSample, TRegion>;
  using Baseclass = typename Superclass::Baseclass;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkOverrideGetNameOfClassMacro(UniformRandomSpatialNeighborSubsampler);

  itkNewMacro(Self);

  using typename Superclass::SampleType;
  using typename Superclass::SampleConstPointer;
  using typename Superclass::MeasurementVectorType;
  using typename Superclass::InstanceIdentifier;
 
  using typename Superclass::SubsampleType;
  using typename Superclass::SubsamplePointer;
  using typename Superclass::SubsampleConstIterator;
  using typename Superclass::InstanceIdentifierHolder;
  using SeedType = typename Baseclass::SeedType;
 
  using SearchSizeType = unsigned long;
  using RandomIntType = unsigned int;

  using typename Superclass::RadiusType;
  using typename Superclass::RegionType;
  using typename Superclass::IndexType;
  using typename Superclass::IndexValueType;
  using typename Superclass::SizeType;
  using typename Superclass::ImageHelperType;
 

  using RandomGeneratorType = Statistics::MersenneTwisterRandomVariateGenerator;
 
  void
  SetSeed(const SeedType seed) override
  {
    Superclass::SetSeed(seed);
    this->m_RandomNumberGenerator->SetSeed(this->m_Seed);
  }
 
  virtual void
  SetUseClockForSeed(const bool & useClock)
  {
    if (useClock != this->m_UseClockForSeed)
    {
      this->m_UseClockForSeed = useClock;
      if (this->m_UseClockForSeed)
      {
        this->m_RandomNumberGenerator->SetSeed();
      }
      this->Modified();
    }
  }
 
  itkBooleanMacro(UseClockForSeed);
  itkGetConstMacro(UseClockForSeed, bool);
 
  virtual void
  SetNumberOfResultsRequested(const SearchSizeType & numberRequested)
  {
    itkDebugMacro("setting NumberOfResultsRequested to " << numberRequested);
    if (this->m_RequestMaximumNumberOfResults || this->m_NumberOfResultsRequested != numberRequested)
    {
      this->m_NumberOfResultsRequested = numberRequested;
      this->m_RequestMaximumNumberOfResults = false;
      this->Modified();
    }
  }
  itkGetConstMacro(NumberOfResultsRequested, SearchSizeType);

  void
  Search(const InstanceIdentifier & query, SubsamplePointer & results) override;
 
protected:
  [[nodiscard]] typename LightObject::Pointer
  InternalClone() const override;
 
  UniformRandomSpatialNeighborSubsampler();
  ~UniformRandomSpatialNeighborSubsampler() override = default;
 
  void
  PrintSelf(std::ostream & os, Indent indent) const override;

  virtual RandomIntType
  GetIntegerVariate(RandomIntType lowerBound, RandomIntType upperBound, RandomIntType itkNotUsed(mean));
 
  SearchSizeType               m_NumberOfResultsRequested{};
  RandomGeneratorType::Pointer m_RandomNumberGenerator{};
  bool                         m_UseClockForSeed{};
}; // end of class UniformRandomSpatialNeighborSubsampler
 
} // namespace itk::Statistics
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkUniformRandomSpatialNeighborSubsampler.hxx"
#endif
 
#endif