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itkMultiResolutionImageRegistrationMethod.hxx
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itkMultiResolutionImageRegistrationMethod.hxx
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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
*
* 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 itkMultiResolutionImageRegistrationMethod_hxx
#define itkMultiResolutionImageRegistrationMethod_hxx
#include "itkMultiResolutionImageRegistrationMethod.h"
#include "itkRecursiveMultiResolutionPyramidImageFilter.h"
namespace itk
{
/**
* Constructor
*/
template <typename TFixedImage, typename TMovingImage>
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::MultiResolutionImageRegistrationMethod()
{
this->SetNumberOfRequiredOutputs(1); // for the Transform
m_FixedImage = nullptr; // has to be provided by the user.
m_MovingImage = nullptr; // has to be provided by the user.
m_Transform = nullptr; // has to be provided by the user.
m_Interpolator = nullptr; // has to be provided by the user.
m_Metric = nullptr; // has to be provided by the user.
m_Optimizer = nullptr; // has to be provided by the user.
// Use MultiResolutionPyramidImageFilter as the default
// image pyramids.
m_FixedImagePyramid = FixedImagePyramidType::New();
m_MovingImagePyramid = MovingImagePyramidType::New();
m_NumberOfLevels = 1;
m_CurrentLevel = 0;
m_Stop = false;
m_ScheduleSpecified = false;
m_NumberOfLevelsSpecified = false;
m_InitialTransformParameters = ParametersType(1);
m_InitialTransformParametersOfNextLevel = ParametersType(1);
m_LastTransformParameters = ParametersType(1);
m_InitialTransformParameters.Fill(0.0f);
m_InitialTransformParametersOfNextLevel.Fill(0.0f);
m_LastTransformParameters.Fill(0.0f);
TransformOutputPointer transformDecorator =
itkDynamicCastInDebugMode<TransformOutputType *>(this->MakeOutput(0).GetPointer());
this->ProcessObject::SetNthOutput(0, transformDecorator.GetPointer());
}
/*
* Initialize by setting the interconnects between components.
*/
template <typename TFixedImage, typename TMovingImage>
void
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::Initialize()
{
// Sanity checks
if (!m_Metric)
{
itkExceptionMacro(<< "Metric is not present");
}
if (!m_Optimizer)
{
itkExceptionMacro(<< "Optimizer is not present");
}
if (!m_Transform)
{
itkExceptionMacro(<< "Transform is not present");
}
if (!m_Interpolator)
{
itkExceptionMacro(<< "Interpolator is not present");
}
// Setup the metric
m_Metric->SetMovingImage(m_MovingImagePyramid->GetOutput(m_CurrentLevel));
m_Metric->SetFixedImage(m_FixedImagePyramid->GetOutput(m_CurrentLevel));
m_Metric->SetTransform(m_Transform);
m_Metric->SetInterpolator(m_Interpolator);
m_Metric->SetFixedImageRegion(m_FixedImageRegionPyramid[m_CurrentLevel]);
m_Metric->Initialize();
// Setup the optimizer
m_Optimizer->SetCostFunction(m_Metric);
m_Optimizer->SetInitialPosition(m_InitialTransformParametersOfNextLevel);
//
// Connect the transform to the Decorator.
//
auto * transformOutput = static_cast<TransformOutputType *>(this->ProcessObject::GetOutput(0));
transformOutput->Set(m_Transform);
}
/*
* Stop the Registration Process
*/
template <typename TFixedImage, typename TMovingImage>
void
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::StopRegistration()
{
m_Stop = true;
}
/**
* Set the schedules for the fixed and moving image pyramid
*/
template <typename TFixedImage, typename TMovingImage>
void
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::SetSchedules(
const ScheduleType & fixedImagePyramidSchedule,
const ScheduleType & movingImagePyramidSchedule)
{
if (m_NumberOfLevelsSpecified)
{
itkExceptionMacro("SetSchedules should not be used "
<< "if numberOfLevelves are specified using SetNumberOfLevels");
}
m_FixedImagePyramidSchedule = fixedImagePyramidSchedule;
m_MovingImagePyramidSchedule = movingImagePyramidSchedule;
m_ScheduleSpecified = true;
// Set the number of levels based on the pyramid schedule specified
if (m_FixedImagePyramidSchedule.rows() != m_MovingImagePyramidSchedule.rows())
{
itkExceptionMacro("The specified schedules contain unequal number of levels");
}
else
{
m_NumberOfLevels = m_FixedImagePyramidSchedule.rows();
}
this->Modified();
}
/**
* Set the number of levels
*/
template <typename TFixedImage, typename TMovingImage>
void
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::SetNumberOfLevels(SizeValueType numberOfLevels)
{
if (m_ScheduleSpecified)
{
itkExceptionMacro("SetNumberOfLevels should not be used "
<< "if schedules have been specified using SetSchedules method ");
}
m_NumberOfLevels = numberOfLevels;
m_NumberOfLevelsSpecified = true;
this->Modified();
}
/**
* Stop the Registration Process
*/
template <typename TFixedImage, typename TMovingImage>
void
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::PreparePyramids()
{
if (!m_Transform)
{
itkExceptionMacro(<< "Transform is not present");
}
m_InitialTransformParametersOfNextLevel = m_InitialTransformParameters;
if (m_InitialTransformParametersOfNextLevel.Size() != m_Transform->GetNumberOfParameters())
{
itkExceptionMacro(<< "Size mismatch between initial parameter and transform");
}
// Sanity checks
if (!m_FixedImage)
{
itkExceptionMacro(<< "FixedImage is not present");
}
if (!m_MovingImage)
{
itkExceptionMacro(<< "MovingImage is not present");
}
if (!m_FixedImagePyramid)
{
itkExceptionMacro(<< "Fixed image pyramid is not present");
}
if (!m_MovingImagePyramid)
{
itkExceptionMacro(<< "Moving image pyramid is not present");
}
// Setup the fixed and moving image pyramid
if (m_NumberOfLevelsSpecified)
{
m_FixedImagePyramid->SetNumberOfLevels(m_NumberOfLevels);
m_MovingImagePyramid->SetNumberOfLevels(m_NumberOfLevels);
}
if (m_ScheduleSpecified)
{
m_FixedImagePyramid->SetNumberOfLevels(m_FixedImagePyramidSchedule.rows());
m_FixedImagePyramid->SetSchedule(m_FixedImagePyramidSchedule);
m_MovingImagePyramid->SetNumberOfLevels(m_MovingImagePyramidSchedule.rows());
m_MovingImagePyramid->SetSchedule(m_MovingImagePyramidSchedule);
}
m_FixedImagePyramid->SetInput(m_FixedImage);
m_FixedImagePyramid->UpdateLargestPossibleRegion();
// Setup the moving image pyramid
m_MovingImagePyramid->SetInput(m_MovingImage);
m_MovingImagePyramid->UpdateLargestPossibleRegion();
using SizeType = typename FixedImageRegionType::SizeType;
using IndexType = typename FixedImageRegionType::IndexType;
ScheduleType schedule = m_FixedImagePyramid->GetSchedule();
itkDebugMacro(<< "FixedImage schedule: " << schedule);
ScheduleType movingschedule = m_MovingImagePyramid->GetSchedule();
itkDebugMacro(<< "MovingImage schedule: " << movingschedule);
SizeType inputSize = m_FixedImageRegion.GetSize();
IndexType inputStart = m_FixedImageRegion.GetIndex();
const SizeValueType numberOfLevels = m_FixedImagePyramid->GetNumberOfLevels();
m_FixedImageRegionPyramid.reserve(numberOfLevels);
m_FixedImageRegionPyramid.resize(numberOfLevels);
// Compute the FixedImageRegion corresponding to each level of the
// pyramid. This uses the same algorithm of the ShrinkImageFilter
// since the regions should be compatible.
for (unsigned int level = 0; level < numberOfLevels; level++)
{
SizeType size;
IndexType start;
for (unsigned int dim = 0; dim < TFixedImage::ImageDimension; dim++)
{
const auto scaleFactor = static_cast<float>(schedule[level][dim]);
size[dim] =
static_cast<typename SizeType::SizeValueType>(std::floor(static_cast<float>(inputSize[dim]) / scaleFactor));
if (size[dim] < 1)
{
size[dim] = 1;
}
start[dim] =
static_cast<typename IndexType::IndexValueType>(std::ceil(static_cast<float>(inputStart[dim]) / scaleFactor));
}
m_FixedImageRegionPyramid[level].SetSize(size);
m_FixedImageRegionPyramid[level].SetIndex(start);
}
}
/*
* PrintSelf
*/
template <typename TFixedImage, typename TMovingImage>
void
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Metric: " << m_Metric.GetPointer() << std::endl;
os << indent << "Optimizer: " << m_Optimizer.GetPointer() << std::endl;
os << indent << "Transform: " << m_Transform.GetPointer() << std::endl;
os << indent << "Interpolator: " << m_Interpolator.GetPointer() << std::endl;
os << indent << "FixedImage: " << m_FixedImage.GetPointer() << std::endl;
os << indent << "MovingImage: " << m_MovingImage.GetPointer() << std::endl;
os << indent << "FixedImagePyramid: ";
os << m_FixedImagePyramid.GetPointer() << std::endl;
os << indent << "MovingImagePyramid: ";
os << m_MovingImagePyramid.GetPointer() << std::endl;
os << indent << "NumberOfLevels: ";
os << m_NumberOfLevels << std::endl;
os << indent << "CurrentLevel: ";
os << m_CurrentLevel << std::endl;
os << indent << "InitialTransformParameters: ";
os << m_InitialTransformParameters << std::endl;
os << indent << "InitialTransformParametersOfNextLevel: ";
os << m_InitialTransformParametersOfNextLevel << std::endl;
os << indent << "LastTransformParameters: ";
os << m_LastTransformParameters << std::endl;
os << indent << "FixedImageRegion: ";
os << m_FixedImageRegion << std::endl;
for (unsigned int level = 0; level < m_FixedImageRegionPyramid.size(); level++)
{
os << indent << "FixedImageRegion at level " << level << ": ";
os << m_FixedImageRegionPyramid[level] << std::endl;
}
os << indent << "FixedImagePyramidSchedule : " << std::endl;
os << m_FixedImagePyramidSchedule << std::endl;
os << indent << "MovingImagePyramidSchedule : " << std::endl;
os << m_MovingImagePyramidSchedule << std::endl;
}
/*
* Generate Data
*/
template <typename TFixedImage, typename TMovingImage>
void
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::GenerateData()
{
m_Stop = false;
this->PreparePyramids();
for (m_CurrentLevel = 0; m_CurrentLevel < m_NumberOfLevels; m_CurrentLevel++)
{
// Invoke an iteration event.
// This allows a UI to reset any of the components between
// resolution level.
this->InvokeEvent(MultiResolutionIterationEvent());
// Check if there has been a stop request
if (m_Stop)
{
break;
}
try
{
// initialize the interconnects between components
this->Initialize();
}
catch (ExceptionObject & err)
{
m_LastTransformParameters = ParametersType(1);
m_LastTransformParameters.Fill(0.0f);
// pass exception to caller
throw err;
}
try
{
// do the optimization
m_Optimizer->StartOptimization();
}
catch (ExceptionObject & err)
{
// An error has occurred in the optimization.
// Update the parameters
m_LastTransformParameters = m_Optimizer->GetCurrentPosition();
// Pass exception to caller
throw err;
}
// get the results
m_LastTransformParameters = m_Optimizer->GetCurrentPosition();
m_Transform->SetParameters(m_LastTransformParameters);
// setup the initial parameters for next level
if (m_CurrentLevel < m_NumberOfLevels - 1)
{
m_InitialTransformParametersOfNextLevel = m_LastTransformParameters;
}
}
}
template <typename TFixedImage, typename TMovingImage>
ModifiedTimeType
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::GetMTime() const
{
ModifiedTimeType mtime = Superclass::GetMTime();
ModifiedTimeType m;
// Some of the following should be removed once ivars are put in the
// input and output lists
if (m_Transform)
{
m = m_Transform->GetMTime();
mtime = (m > mtime ? m : mtime);
}
if (m_Interpolator)
{
m = m_Interpolator->GetMTime();
mtime = (m > mtime ? m : mtime);
}
if (m_Metric)
{
m = m_Metric->GetMTime();
mtime = (m > mtime ? m : mtime);
}
if (m_Optimizer)
{
m = m_Optimizer->GetMTime();
mtime = (m > mtime ? m : mtime);
}
if (m_FixedImage)
{
m = m_FixedImage->GetMTime();
mtime = (m > mtime ? m : mtime);
}
if (m_MovingImage)
{
m = m_MovingImage->GetMTime();
mtime = (m > mtime ? m : mtime);
}
return mtime;
}
/*
* Get Output
*/
template <typename TFixedImage, typename TMovingImage>
const typename MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::TransformOutputType *
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::GetOutput() const
{
return static_cast<const TransformOutputType *>(this->ProcessObject::GetOutput(0));
}
template <typename TFixedImage, typename TMovingImage>
DataObject::Pointer
MultiResolutionImageRegistrationMethod<TFixedImage, TMovingImage>::MakeOutput(DataObjectPointerArraySizeType output)
{
if (output > 0)
{
itkExceptionMacro("MakeOutput request for an output number larger than the expected number of outputs.");
}
return TransformOutputType::New().GetPointer();
}
} // end namespace itk
#endif