itkImageRegistrationMethodImageSource.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 itkImageRegistrationMethodImageSource_h
#define itkImageRegistrationMethodImageSource_h
#include "itkImage.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkCommandIterationUpdate.h"
#include "itkOptimizerParameters.h"

 
namespace itk::testhelper
{
 
template <typename TFixedPixelType, typename TMovingPixelType, unsigned int VDimension>
class ImageRegistrationMethodImageSource : public itk::Object
{
public:
  using Self = ImageRegistrationMethodImageSource;
  using Superclass = Object;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
  using ParametersType = OptimizerParameters<double>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(ImageRegistrationMethodImageSource);
 
 
  using MovingImageType = itk::Image<TMovingPixelType, VDimension>;
  using FixedImageType = itk::Image<TFixedPixelType, VDimension>;
 
  const MovingImageType *
  GetMovingImage() const
  {
    return m_MovingImage.GetPointer();
  }
 
  const FixedImageType *
  GetFixedImage() const
  {
    return m_FixedImage.GetPointer();
  }
 
  const ParametersType &
  GetActualParameters() const
  {
    return m_Parameters;
  }
 
 
  void
  GenerateImages(const typename MovingImageType::SizeType & size)
  {
    const typename MovingImageType::RegionType region(size);
 
    m_MovingImage->SetRegions(region);
    m_MovingImage->Allocate();
 
    m_FixedImage->SetRegions(region);
    m_FixedImage->Allocate();
 
    /* Fill images with a 2D gaussian*/
    using MovingImageIteratorType = itk::ImageRegionIteratorWithIndex<MovingImageType>;
 
    using FixedImageIteratorType = itk::ImageRegionIteratorWithIndex<FixedImageType>;
 
 
    itk::Point<double, 2> center;
    center[0] = static_cast<double>(region.GetSize()[0]) / 2.0;
    center[1] = static_cast<double>(region.GetSize()[1]) / 2.0;
 
    const double s = static_cast<double>(region.GetSize()[0]) / 2.0;
 
    itk::Point<double, 2>  p;
    itk::Vector<double, 2> d;
 
    /* Set the displacement */
    itk::Vector<double, 2> displacement;
    displacement[0] = m_Parameters[0];
    displacement[1] = m_Parameters[1];
 
 
    MovingImageIteratorType ri(m_MovingImage, region);
    FixedImageIteratorType  ti(m_FixedImage, region);
    while (!ri.IsAtEnd())
    {
      p[0] = ri.GetIndex()[0];
      p[1] = ri.GetIndex()[1];
      d = p - center;
      d += displacement;
      const double x = d[0];
      const double y = d[1];
      const double value = 200.0 * std::exp(-(x * x + y * y) / (s * s));
      ri.Set(static_cast<typename MovingImageType::PixelType>(value));
      ++ri;
    }
 
 
    while (!ti.IsAtEnd())
    {
      p[0] = ti.GetIndex()[0];
      p[1] = ti.GetIndex()[1];
      d = p - center;
      const double x = d[0];
      const double y = d[1];
      const double value = 200.0 * std::exp(-(x * x + y * y) / (s * s));
      ti.Set(static_cast<typename FixedImageType::PixelType>(value));
      ++ti;
    }
  }
 
protected:
  ImageRegistrationMethodImageSource()
    : m_FixedImage(FixedImageType::New())
    , m_MovingImage(MovingImageType::New())
  {
    m_Parameters = ParametersType(2);
    m_Parameters[0] = 7.0;
    m_Parameters[1] = 3.0;
  }
 
private:
  typename FixedImageType::Pointer  m_FixedImage{};
  typename MovingImageType::Pointer m_MovingImage{};
 
  ParametersType m_Parameters{};
};
 
} // namespace itk::testhelper
 
// end namespace itk
#endif