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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 elxPowell_hxx
#define elxPowell_hxx
#include "elxPowell.h"
#include <iomanip>
#include <string>
#include <vnl/vnl_math.h>
namespace elastix
{
/**
* ***************** BeforeRegistration ***********************
*/
template <class TElastix>
void
Powell<TElastix>::BeforeRegistration()
{
/** Add the target cell "stepsize" to IterationInfo.*/
this->AddTargetCellToIterationInfo("2:Metric");
this->AddTargetCellToIterationInfo("3:StepSize");
this->AddTargetCellToIterationInfo("4:||Gradient||");
/** Format the metric and stepsize as floats */
this->GetIterationInfoAt("2:Metric") << std::showpoint << std::fixed;
this->GetIterationInfoAt("3:StepSize") << std::showpoint << std::fixed;
this->GetIterationInfoAt("4:||Gradient||") << std::showpoint << std::fixed;
} // end BeforeRegistration
/**
* ***************** BeforeEachResolution ***********************
*/
template <class TElastix>
void
Powell<TElastix>::BeforeEachResolution()
{
/** Get the current resolution level.*/
unsigned int level = static_cast<unsigned int>(this->m_Registration->GetAsITKBaseType()->GetCurrentLevel());
/** Set the value tolerance.*/
double valueTolerance = 1e-8;
this->m_Configuration->ReadParameter(valueTolerance, "ValueTolerance", this->GetComponentLabel(), level, 0);
this->SetValueTolerance(valueTolerance);
/** Set the MaximumStepLength.*/
double maxStepLength = 16.0 / std::pow(2.0, static_cast<int>(level));
this->m_Configuration->ReadParameter(maxStepLength, "MaximumStepLength", this->GetComponentLabel(), level, 0);
this->SetStepLength(maxStepLength);
/** Set the MinimumStepLength.*/
double stepTolerance = 0.5 / std::pow(2.0, static_cast<int>(level));
this->m_Configuration->ReadParameter(stepTolerance, "StepTolerance", this->GetComponentLabel(), level, 0);
this->SetStepTolerance(stepTolerance);
/** Set the maximumNumberOfIterations.*/
unsigned int maximumNumberOfIterations = 500;
this->m_Configuration->ReadParameter(
maximumNumberOfIterations, "MaximumNumberOfIterations", this->GetComponentLabel(), level, 0);
this->SetMaximumIteration(maximumNumberOfIterations);
} // end BeforeEachResolution
/**
* ***************** AfterEachIteration *************************
*/
template <class TElastix>
void
Powell<TElastix>::AfterEachIteration()
{
/** Print some information */
this->GetIterationInfoAt("2:Metric") << this->GetValue();
this->GetIterationInfoAt("3:StepSize") << this->GetStepLength();
} // end AfterEachIteration
/**
* ***************** AfterEachResolution *************************
*/
template <class TElastix>
void
Powell<TElastix>::AfterEachResolution()
{
/**
* enum StopConditionType { GradientMagnitudeTolerance = 1, StepTooSmall,
* ImageNotAvailable, CostFunctionError, MaximumNumberOfIterations
*/
std::string stopcondition = this->GetStopConditionDescription();
/** Print the stopping condition */
log::info(std::ostringstream{} << "Stopping condition: " << stopcondition << ".");
} // end AfterEachResolution
/**
* ******************* AfterRegistration ************************
*/
template <class TElastix>
void
Powell<TElastix>::AfterRegistration()
{
/** Print the best metric value */
double bestValue = this->GetValue();
log::info(std::ostringstream{} << '\n' << "Final metric value = " << bestValue);
} // end AfterRegistration
/**
* ******************* SetInitialPosition ***********************
*/
template <class TElastix>
void
Powell<TElastix>::SetInitialPosition(const ParametersType & param)
{
/** Override the implementation in itkOptimizer.h, to
* ensure that the scales array and the parameters
* array have the same size.
*/
/** Call the Superclass' implementation. */
this->Superclass1::SetInitialPosition(param);
/** Set the scales array to the same size if the size has been changed */
ScalesType scales = this->GetScales();
unsigned int paramsize = param.Size();
if ((scales.Size()) != paramsize)
{
ScalesType newscales(paramsize, 1.0);
this->SetScales(newscales);
}
/** \todo to optimizerbase? */
} // end SetInitialPosition
} // end namespace elastix
#endif // end #ifndef elxPowell_hxx
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