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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 itkCenteredTransformInitializer_hxx
#define itkCenteredTransformInitializer_hxx
namespace itk
{
template <typename TTransform, typename TFixedImage, typename TMovingImage>
void
CenteredTransformInitializer<TTransform, TFixedImage, TMovingImage>::InitializeTransform()
{
// Sanity check
if (!m_FixedImage)
{
itkExceptionMacro("Fixed Image has not been set");
}
if (!m_MovingImage)
{
itkExceptionMacro("Moving Image has not been set");
}
if (!m_Transform)
{
itkExceptionMacro("Transform has not been set");
}
// If images come from filters, then update those filters.
m_FixedImage->UpdateSource();
m_MovingImage->UpdateSource();
InputPointType rotationCenter;
OutputVectorType translationVector;
if (m_UseMoments)
{
m_FixedCalculator->SetImage(m_FixedImage);
m_FixedCalculator->Compute();
m_MovingCalculator->SetImage(m_MovingImage);
m_MovingCalculator->Compute();
typename FixedImageCalculatorType::VectorType fixedCenter = m_FixedCalculator->GetCenterOfGravity();
typename MovingImageCalculatorType::VectorType movingCenter = m_MovingCalculator->GetCenterOfGravity();
for (unsigned int i = 0; i < InputSpaceDimension; ++i)
{
rotationCenter[i] = fixedCenter[i];
translationVector[i] = movingCenter[i] - fixedCenter[i];
}
}
else
{
// Here use the geometrical center of each image.
const typename FixedImageType::RegionType & fixedRegion = m_FixedImage->GetLargestPossibleRegion();
const typename FixedImageType::IndexType & fixedIndex = fixedRegion.GetIndex();
const typename FixedImageType::SizeType & fixedSize = fixedRegion.GetSize();
InputPointType centerFixedPoint;
using CoordRepType = typename InputPointType::ValueType;
using ContinuousIndexType = ContinuousIndex<CoordRepType, InputSpaceDimension>;
using ContinuousIndexValueType = typename ContinuousIndexType::ValueType;
ContinuousIndexType centerFixedIndex;
for (unsigned int k = 0; k < InputSpaceDimension; ++k)
{
centerFixedIndex[k] = static_cast<ContinuousIndexValueType>(fixedIndex[k]) +
static_cast<ContinuousIndexValueType>(fixedSize[k] - 1) / 2.0;
}
m_FixedImage->TransformContinuousIndexToPhysicalPoint(centerFixedIndex, centerFixedPoint);
const typename MovingImageType::RegionType & movingRegion = m_MovingImage->GetLargestPossibleRegion();
const typename MovingImageType::IndexType & movingIndex = movingRegion.GetIndex();
const typename MovingImageType::SizeType & movingSize = movingRegion.GetSize();
InputPointType centerMovingPoint;
ContinuousIndexType centerMovingIndex;
for (unsigned int m = 0; m < InputSpaceDimension; ++m)
{
centerMovingIndex[m] = static_cast<ContinuousIndexValueType>(movingIndex[m]) +
static_cast<ContinuousIndexValueType>(movingSize[m] - 1) / 2.0;
}
m_MovingImage->TransformContinuousIndexToPhysicalPoint(centerMovingIndex, centerMovingPoint);
for (unsigned int i = 0; i < InputSpaceDimension; ++i)
{
rotationCenter[i] = centerFixedPoint[i];
translationVector[i] = centerMovingPoint[i] - centerFixedPoint[i];
}
}
m_Transform->SetCenter(rotationCenter);
m_Transform->SetTranslation(translationVector);
}
template <typename TTransform, typename TFixedImage, typename TMovingImage>
void
CenteredTransformInitializer<TTransform, TFixedImage, TMovingImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
itkPrintSelfObjectMacro(Transform);
itkPrintSelfObjectMacro(FixedImage);
itkPrintSelfObjectMacro(MovingImage);
os << indent << "UseMoments: " << (m_UseMoments ? "On" : "Off") << std::endl;
itkPrintSelfObjectMacro(MovingCalculator);
itkPrintSelfObjectMacro(FixedCalculator);
}
} // namespace itk
#endif /* itkCenteredTransformInitializer_hxx */
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