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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* 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 itkCyclicGridScheduleComputer_hxx
#define itkCyclicGridScheduleComputer_hxx
#include "itkCyclicGridScheduleComputer.h"
#include "itkConfigure.h"
#include "itkImageRegionExclusionConstIteratorWithIndex.h"
namespace itk
{
/**
* ********************* ComputeBSplineGrid ****************************
*/
template <typename TTransformScalarType, unsigned int VImageDimension>
void
CyclicGridScheduleComputer<TTransformScalarType, VImageDimension>::ComputeBSplineGrid()
{
/** Call superclass method. */
// Superclass::ComputeBSplineGrid();
OriginType imageOrigin;
SpacingType imageSpacing, finalGridSpacing;
DirectionType imageDirection;
/** Apply the initial transform. */
this->ApplyInitialTransform(imageOrigin, imageSpacing, imageDirection, finalGridSpacing);
/** Set the appropriate sizes. */
this->m_GridOrigins.resize(this->GetNumberOfLevels());
this->m_GridRegions.resize(this->GetNumberOfLevels());
this->m_GridSpacings.resize(this->GetNumberOfLevels());
this->m_GridDirections.resize(this->GetNumberOfLevels());
/** For all levels ... */
for (unsigned int res = 0; res < this->GetNumberOfLevels(); ++res)
{
/** For all dimensions ... */
SizeType size = this->GetImageRegion().GetSize();
SizeType gridsize;
for (unsigned int dim = 0; dim < Dimension; ++dim)
{
/** Compute the grid spacings. */
double gridSpacing = finalGridSpacing[dim] * this->m_GridSpacingFactors[res][dim];
/** Check if the grid spacing matches the Cyclic behaviour of this
* transform. We want the spacing at the borders for the last dimension
* to be half the grid spacing.
*/
unsigned int bareGridSize = 0;
if (dim == Dimension - 1)
{
const float lastDimSizeInPhysicalUnits = imageSpacing[dim] * this->GetImageRegion().GetSize(dim);
/** Compute closest correct spacing. */
/** Compute number of nodes. */
bareGridSize = static_cast<unsigned int>(lastDimSizeInPhysicalUnits / gridSpacing);
/** Compute new (larger) gridspacing. */
gridSpacing = lastDimSizeInPhysicalUnits / static_cast<float>(bareGridSize);
}
else
{
/** Compute the grid size without the extra grid points at the edges. */
bareGridSize = static_cast<unsigned int>(std::ceil(size[dim] * imageSpacing[dim] / gridSpacing));
}
this->m_GridSpacings[res][dim] = gridSpacing;
/** The number of B-spline grid nodes is the bareGridSize plus the
* B-spline order more grid nodes (for all dimensions but the last).
* The last dimension has the bareGridSize.
*/
gridsize[dim] = static_cast<SizeValueType>(bareGridSize);
if (dim < Dimension - 1)
{
gridsize[dim] += static_cast<SizeValueType>(this->GetBSplineOrder());
}
/** Compute the origin of the B-spline grid. */
this->m_GridOrigins[res][dim] =
imageOrigin[dim] - ((gridsize[dim] - 1) * gridSpacing - (size[dim] - 1) * imageSpacing[dim]) / 2.0;
}
/** Take into account direction cosines:
* rotate grid origin around image origin. */
this->m_GridOrigins[res] = imageOrigin + imageDirection * (this->m_GridOrigins[res] - imageOrigin);
/** Set the grid region. */
this->m_GridRegions[res].SetSize(gridsize);
/** Simply copy the image direction for now */
this->m_GridDirections[res] = imageDirection;
}
} // end ComputeBSplineGrid()
} // end namespace itk
#endif // end #ifndef itkCyclicGridScheduleComputer_hxx
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