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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 elxRandomCoordinateSampler_hxx
#define elxRandomCoordinateSampler_hxx
#include "elxRandomCoordinateSampler.h"
#include <itkDeref.h>
#include "itkLinearInterpolateImageFunction.h"
namespace elastix
{
/**
* ******************* BeforeEachResolution ******************
*/
template <class TElastix>
void
RandomCoordinateSampler<TElastix>::BeforeEachResolution()
{
const Configuration & configuration = itk::Deref(Superclass2::GetConfiguration());
const unsigned int level = this->m_Registration->GetAsITKBaseType()->GetCurrentLevel();
/** Set the NumberOfSpatialSamples. */
unsigned long numberOfSpatialSamples = 5000;
configuration.ReadParameter(numberOfSpatialSamples, "NumberOfSpatialSamples", this->GetComponentLabel(), level, 0);
this->SetNumberOfSamples(numberOfSpatialSamples);
/** Set up the fixed image interpolator and set the SplineOrder, default value = 1. */
unsigned int splineOrder = 1;
configuration.ReadParameter(splineOrder, "FixedImageBSplineInterpolationOrder", this->GetComponentLabel(), level, 0);
if (splineOrder == 1)
{
using LinearInterpolatorType = itk::LinearInterpolateImageFunction<InputImageType, CoordRepType>;
auto fixedImageLinearInterpolator = LinearInterpolatorType::New();
this->SetInterpolator(fixedImageLinearInterpolator);
}
else
{
auto fixedImageBSplineInterpolator = DefaultInterpolatorType::New();
fixedImageBSplineInterpolator->SetSplineOrder(splineOrder);
this->SetInterpolator(fixedImageBSplineInterpolator);
}
/** Set the UseRandomSampleRegion bool. */
bool useRandomSampleRegion = false;
configuration.ReadParameter(useRandomSampleRegion, "UseRandomSampleRegion", this->GetComponentLabel(), level, 0);
this->SetUseRandomSampleRegion(useRandomSampleRegion);
/** Set the SampleRegionSize. */
if (useRandomSampleRegion)
{
InputImageSpacingType sampleRegionSize;
InputImageSpacingType fixedImageSpacing = this->GetElastix()->GetFixedImage()->GetSpacing();
InputImageSizeType fixedImageSize = this->GetElastix()->GetFixedImage()->GetLargestPossibleRegion().GetSize();
/** Estimate default:
* sampleRegionSize[i] = min ( fixedImageSizeInMM[i], max_i ( fixedImageSizeInMM[i]/3 ) )
*/
double maxthird = 0.0;
for (unsigned int i = 0; i < InputImageDimension; ++i)
{
sampleRegionSize[i] = (fixedImageSize[i] - 1) * fixedImageSpacing[i];
maxthird = std::max(maxthird, sampleRegionSize[i] / 3.0);
}
for (unsigned int i = 0; i < InputImageDimension; ++i)
{
sampleRegionSize[i] = std::min(maxthird, sampleRegionSize[i]);
}
/** Read and check user's choice. */
for (unsigned int i = 0; i < InputImageDimension; ++i)
{
configuration.ReadParameter(
sampleRegionSize[i], "SampleRegionSize", this->GetComponentLabel(), level * InputImageDimension + i, 0);
}
this->SetSampleRegionSize(sampleRegionSize);
for (unsigned int i = 0; i < InputImageDimension; ++i)
{
if (sampleRegionSize[i] > (fixedImageSize[i] - 1) * fixedImageSpacing[i])
{
itkExceptionMacro("ERROR: in your parameter file you selected\n"
<< " SampleRegionSize[ " << i << " ] = " << sampleRegionSize[i]
<< " mm,\n while the fixed image size at dim = " << i << " is " << fixedImageSize[i]
<< " voxels or " << fixedImageSize[i] * fixedImageSpacing[i] << " mm.\n"
<< " Please select a smaller SampleRegionSize!\n"
<< " It is recommended to be not larger than 1/3 of the image size in mm.");
}
}
}
} // end BeforeEachResolution()
} // end namespace elastix
#endif // end #ifndef elxRandomCoordinateSampler_hxx
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