itkCovarianceImageFunction.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 itkCovarianceImageFunction_h
#define itkCovarianceImageFunction_h
 
#include "itkImageFunction.h"
#include "itkNumericTraits.h"
 
namespace itk
{
template <typename TInputImage, typename TCoordinate = float>
class ITK_TEMPLATE_EXPORT CovarianceImageFunction
  : public ImageFunction<TInputImage,
                         vnl_matrix<typename NumericTraits<typename TInputImage::PixelType::ValueType>::RealType>,
                         TCoordinate>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(CovarianceImageFunction);

  using Self = CovarianceImageFunction;
  using Superclass =
    ImageFunction<TInputImage,
                  vnl_matrix<typename NumericTraits<typename TInputImage::PixelType::ValueType>::RealType>,
                  TCoordinate>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkOverrideGetNameOfClassMacro(CovarianceImageFunction);

  itkNewMacro(Self);

  using InputImageType = TInputImage;

  using typename Superclass::OutputType;

  using typename Superclass::IndexType;

  using typename Superclass::ContinuousIndexType;

  using typename Superclass::PointType;

  static constexpr unsigned int ImageDimension = InputImageType::ImageDimension;

  using RealType = vnl_matrix<typename NumericTraits<typename InputImageType::PixelType::ValueType>::RealType>;

  RealType
  EvaluateAtIndex(const IndexType & index) const override;

  RealType
  Evaluate(const PointType & point) const override
  {
    IndexType index;
 
    this->ConvertPointToNearestIndex(point, index);
    return this->EvaluateAtIndex(index);
  }
 
  RealType
  EvaluateAtContinuousIndex(const ContinuousIndexType & cindex) const override
  {
    IndexType index;
 
    this->ConvertContinuousIndexToNearestIndex(cindex, index);
    return this->EvaluateAtIndex(index);
  }

  itkSetMacro(NeighborhoodRadius, unsigned int);
  itkGetConstReferenceMacro(NeighborhoodRadius, unsigned int);
 
protected:
  CovarianceImageFunction();
  ~CovarianceImageFunction() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
private:
  unsigned int m_NeighborhoodRadius{ 1 };
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkCovarianceImageFunction.hxx"
#endif
 
#endif