itkOrthogonalSwath2DPathFilter.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 itkOrthogonalSwath2DPathFilter_h
#define itkOrthogonalSwath2DPathFilter_h
 
#include "itkPathAndImageToPathFilter.h"
#include "itkOrthogonallyCorrected2DParametricPath.h"
 
#include <memory> // For unique_ptr.
 
namespace itk
{
template <typename TFourierSeriesPath, typename TSwathMeritImage>
class ITK_TEMPLATE_EXPORT OrthogonalSwath2DPathFilter
  : public PathAndImageToPathFilter<TFourierSeriesPath, TSwathMeritImage, OrthogonallyCorrected2DParametricPath>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(OrthogonalSwath2DPathFilter);

  using Self = OrthogonalSwath2DPathFilter;
  using Superclass =
    PathAndImageToPathFilter<TFourierSeriesPath, TSwathMeritImage, OrthogonallyCorrected2DParametricPath>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(OrthogonalSwath2DPathFilter);

  using InputPathType = TFourierSeriesPath;
  using InputPathPointer = typename InputPathType::Pointer;
  using InputPathInputType = typename InputPathType::InputType;
 
  using ImageType = TSwathMeritImage;
  using ImageConstPointer = typename ImageType::ConstPointer;
 
  using OutputPathType = OrthogonallyCorrected2DParametricPath;
  using OutputPathPointer = OutputPathType::Pointer;
  using OutputPathInputType = OutputPathType::InputType;
  using OrthogonalCorrectionTableType = OutputPathType::OrthogonalCorrectionTableType;
  using OrthogonalCorrectionTablePointer = OutputPathType::OrthogonalCorrectionTablePointer;
 
  using IndexType = typename InputPathType::IndexType;
  using OffsetType = typename InputPathType::OffsetType;
  using SizeType = typename ImageType::SizeType;
 
protected:
  OrthogonalSwath2DPathFilter() = default;
  ~OrthogonalSwath2DPathFilter() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;
 
  void
  GenerateData() override;
 
private:
  // Find the "L" for the maximum merit over the range L-1 to L+1 at F & x.
  // This value is both returned and stored in m_StepValues.
  // The merits for F & x at L-1 to L+1 must have already been calculated.
  unsigned int
  FindAndStoreBestErrorStep(unsigned int x, unsigned int F, unsigned int L);
 
  // m_StepValues & m_MeritValues are stored as datatype[x][F][L] which requires
  // cols*rows*rows bytes of storage where rows and cols are the dimensions of
  // the processed image.
  //
  // This ordering of elements is most efficient when L is incremented in the
  // inner-most loop and x is incremented in the outer-most loop.
  //
  // m_StepValues & m_MeritValues should always be accessed using the
  // StepValue()
  // and MeritValue() access functions.  StepValue() and MeritValue() can each
  // be
  // used on both the left and right hand of assignments for reads & writes, ex:
  // StepValue(1,1,1) = 2+MeritValue(0,0,3);
  inline int &
  StepValue(int f, int l, int x)
  {
    const int rows = m_SwathSize[1];
 
    return m_StepValues[(x * rows * rows) + (f * rows) + (l)];
  }
 
  inline double &
  MeritValue(int f, int l, int x)
  {
    const int rows = m_SwathSize[1];
 
    return m_MeritValues[(x * rows * rows) + (f * rows) + (l)];
  }
 
  std::unique_ptr<int[]> m_StepValues{ nullptr }; // best y=error coordinate @ x of image for (0,F) ->
                                                  // (x+1,L)
  std::unique_ptr<double[]> m_MeritValues{ nullptr };
 
  std::unique_ptr<int[]> m_OptimumStepsValues{ nullptr }; // best step (e value)
                                                          // sequence for a
                                                          // closed path
  OrthogonalCorrectionTablePointer m_FinalOffsetValues{ OrthogonalCorrectionTableType::New() };
 
  SizeType m_SwathSize{ { 0 } };
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkOrthogonalSwath2DPathFilter.hxx"
#endif
 
#endif