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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 itkFrequencyBandImageFilter_hxx
#define itkFrequencyBandImageFilter_hxx
#include "itkMath.h"
#include "itkImageAlgorithm.h"
#include <algorithm>
#include <cmath>
namespace itk
{
template <typename TImageType, typename TFrequencyIterator>
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::FrequencyBandImageFilter()
: m_LowFrequencyThreshold(0)
, m_HighFrequencyThreshold(0.5)
{
this->InPlaceOff();
this->DynamicMultiThreadingOn();
this->SetFunctor([this](FrequencyIteratorType & f) { this->BandPass(f); });
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "FrequencyThresholds: Low: " << this->m_LowFrequencyThreshold
<< ", High: " << this->m_HighFrequencyThreshold << std::endl;
os << indent << (this->m_PassBand ? "PassBand " : "StopBand ") << std::endl;
os << indent << " PassLowFrequencyThreshold? " << (this->m_PassLowFrequencyThreshold ? "Yes" : "No ") << std::endl;
os << indent << " PassHighFrequencyThreshold? " << (this->m_PassHighFrequencyThreshold ? "Yes" : "No ")
<< std::endl;
os << indent << " RadialBand? " << (this->m_RadialBand ? "Yes" : "No ") << std::endl;
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::SetPassBand(const bool passLowThreshold,
const bool passHighThreshold)
{
this->m_PassBand = true;
this->m_PassLowFrequencyThreshold = passLowThreshold;
this->m_PassHighFrequencyThreshold = passHighThreshold;
this->Modified();
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::SetStopBand(const bool passLowThreshold,
const bool passHighThreshold)
{
this->m_PassBand = false;
this->m_PassLowFrequencyThreshold = passLowThreshold;
this->m_PassHighFrequencyThreshold = passHighThreshold;
this->Modified();
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::SetFrequencyThresholds(const FrequencyValueType & freqLow,
const FrequencyValueType & freqHigh)
{
itkAssertInDebugAndIgnoreInReleaseMacro(freqLow <= freqHigh);
this->m_LowFrequencyThreshold = freqLow;
this->m_HighFrequencyThreshold = freqHigh;
this->Modified();
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::SetLowFrequencyThresholdInRadians(
const FrequencyValueType & freqLowInRadians)
{
this->SetLowFrequencyThreshold(freqLowInRadians * 0.5 * Math::one_over_pi);
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::SetHighFrequencyThresholdInRadians(
const FrequencyValueType & freqHighInRadians)
{
this->SetHighFrequencyThreshold(freqHighInRadians * 0.5 * Math::one_over_pi);
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::SetFrequencyThresholdsInRadians(
const FrequencyValueType & freqLowInRadians,
const FrequencyValueType & freqHighInRadians)
{
this->SetFrequencyThresholds(freqLowInRadians * 0.5 * Math::one_over_pi, freqHighInRadians * 0.5 * Math::one_over_pi);
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::VerifyPreconditions() ITKv5_CONST
{
this->Superclass::VerifyPreconditions();
if (this->m_LowFrequencyThreshold > this->m_HighFrequencyThreshold)
{
itkExceptionMacro("FrequencyThresholds are illogical; Low > High: " << this->m_LowFrequencyThreshold << " > "
<< this->m_HighFrequencyThreshold);
}
}
template <typename TImageType, typename TFrequencyIterator>
void
FrequencyBandImageFilter<TImageType, TFrequencyIterator>::BandPass(FrequencyIteratorType & freqIt)
{
FrequencyValueType scalarFrequency;
typename FrequencyIteratorType::FrequencyType vectorFrequency;
FrequencyValueType maxFrequency;
FrequencyValueType minFrequency;
bool freqIsNegative = false;
if (this->m_RadialBand)
{
scalarFrequency = sqrt(freqIt.GetFrequencyModuloSquare());
}
else // Cut-off box taking into account max absolute scalar frequency.
{
vectorFrequency = freqIt.GetFrequency();
maxFrequency = itk::Math::abs(*std::max_element(vectorFrequency.cbegin(), vectorFrequency.cend()));
minFrequency = itk::Math::abs(*std::min_element(vectorFrequency.cbegin(), vectorFrequency.cend()));
scalarFrequency = std::max(maxFrequency, minFrequency);
if (minFrequency < maxFrequency)
{
freqIsNegative = true;
}
}
if (this->m_PassBand)
{
if (scalarFrequency < this->m_LowFrequencyThreshold || scalarFrequency > this->m_HighFrequencyThreshold)
{
freqIt.Set(PixelType{});
}
}
else // Stop Band
{
if (scalarFrequency > this->m_LowFrequencyThreshold && scalarFrequency < this->m_HighFrequencyThreshold)
{
freqIt.Set(PixelType{});
}
}
// Boundaries: Do not pass threshold frequencies if requested.
if (!this->m_PassLowFrequencyThreshold)
{
if (Math::FloatAlmostEqual(scalarFrequency, this->m_LowFrequencyThreshold))
{
// Different boundaries when negative frequencies in the non-radial case.
if (!this->m_RadialBand && this->m_PassNegativeLowFrequencyThreshold && freqIsNegative)
{
return;
}
else
{
freqIt.Set(PixelType{});
}
}
}
if (!this->m_PassHighFrequencyThreshold)
{
if (Math::FloatAlmostEqual(scalarFrequency, this->m_HighFrequencyThreshold))
{
// Different boundaries when negative frequencies in the non-radial case.
if (!this->m_RadialBand && this->m_PassNegativeHighFrequencyThreshold && freqIsNegative)
{
return;
}
else
{
freqIt.Set(PixelType{});
}
}
}
}
} // end namespace itk
#endif
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