itkLaplacianOperator.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  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
 *
 *         http://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 itkLaplacianOperator_h
#define itkLaplacianOperator_h

#include "itkNeighborhoodOperator.h"

namespace itk
{
template< typename TPixel, unsigned int VDimension = 2,
          typename TAllocator = NeighborhoodAllocator< TPixel > >
class ITK_TEMPLATE_EXPORT LaplacianOperator:
  public NeighborhoodOperator< TPixel, VDimension, TAllocator >
{
public:

  using Self = LaplacianOperator;

  using Superclass = NeighborhoodOperator< TPixel, VDimension, TAllocator >;

  using PixelType = typename Superclass::PixelType;
  using SizeType = typename Superclass::SizeType;

  LaplacianOperator()
  {
    for ( unsigned i = 0; i < VDimension; ++i )
      {
      m_DerivativeScalings[i] = 1.0;
      }
  }

  LaplacianOperator(const Self & other):
    NeighborhoodOperator< TPixel, VDimension, TAllocator >(other)
  {
    for ( unsigned i = 0; i < VDimension; ++i )
      {
      m_DerivativeScalings[i] = other.m_DerivativeScalings[i];
      }
  }

  void CreateOperator();

  Self & operator=(const Self & other)
  {
    Superclass::operator=(other);
    return *this;
  }

  void PrintSelf(std::ostream & os, Indent i) const override
  {
    os << i << "LaplacianOperator { this=" << this
       << "}" << std::endl;
    Superclass::PrintSelf( os, i.GetNextIndent() );
  }

  void SetDerivativeScalings(const double *s);

protected:
  using CoefficientVector = typename Superclass::CoefficientVector;

  CoefficientVector GenerateCoefficients() override;

  void Fill(const CoefficientVector &) override;

private:
  double m_DerivativeScalings[VDimension];
};
} // namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLaplacianOperator.hxx"
#endif

#endif