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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"
/**
* This class generates two 2D-Gaussians (standard deviation RegionSize/2)
* One is shifted by 7,3 pixels from the other.
*
* These two images are provided to the registration methods in this
* directory in order to obtain a uniform test input data.
*
* Therefore the solution of the registration is |-7 -3|
*/
namespace itk
{
namespace 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>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
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_MovingImage = MovingImageType::New();
m_FixedImage = FixedImageType::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{};
};
} // end namespace testhelper
} // end namespace itk
#endif
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