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/*
* Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* 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
*
* 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 otbProlateInterpolateImageFunction_hxx
#define otbProlateInterpolateImageFunction_hxx
#include "otbProlateInterpolateImageFunction.h"
namespace otb
{
namespace Function
{
template <class TInput, class TOutput>
double ProlateFunction<TInput, TOutput>::ComputeEnergy(double resampleRatio) const
{
vnl_vector<std::complex<double>> resampledProfile(1024);
resampledProfile.fill(0);
for (unsigned int i = 0; i < m_Radius + 1; ++i)
{
unsigned int ival = static_cast<unsigned int>(static_cast<double>(m_OriginalProfile.size() * i) / static_cast<double>(m_Radius + 1));
resampledProfile[i] = m_OriginalProfile[ival];
}
vnl_fft_1d<double> v1d(1024);
v1d.fwd_transform(resampledProfile);
// Carrful, spectrum is symmetrical
unsigned int sampleNb = static_cast<unsigned int>(1024 / (2 * resampleRatio));
double energy = 0.;
// First part of spectrum
for (unsigned int j = 0; j < sampleNb + 1; ++j)
{
energy += std::abs(resampledProfile[j]) * std::abs(resampledProfile[j]);
}
// Last part of spectrum
for (unsigned int j = 1023; j > 1023 - sampleNb; j--)
{
energy += std::abs(resampledProfile[j]) * std::abs(resampledProfile[j]);
}
double totalEnergy = energy;
// Middle part
for (unsigned int j = sampleNb + 1; j < 1023 - sampleNb + 1; ++j)
{
totalEnergy += std::abs(resampledProfile[j]) * std::abs(resampledProfile[j]);
}
return std::sqrt(energy) / std::sqrt(totalEnergy);
}
} // end namespace Function
/** Constructor */
template <class TInputImage, class TBoundaryCondition, class TCoordRep, class TInputInterpolator, class TOutputInterpolator>
ProlateInterpolateImageFunction<TInputImage, TBoundaryCondition, TCoordRep, TInputInterpolator, TOutputInterpolator>::ProlateInterpolateImageFunction()
{
// VectorType m_ResampledProfil(1, 0.);
this->SetNormalizeWeight(true);
}
/** Destructor */
template <class TInputImage, class TBoundaryCondition, class TCoordRep, class TInputInterpolator, class TOutputInterpolator>
ProlateInterpolateImageFunction<TInputImage, TBoundaryCondition, TCoordRep, TInputInterpolator, TOutputInterpolator>::~ProlateInterpolateImageFunction()
{
}
template <class TInputImage, class TBoundaryCondition, class TCoordRep, class TInputInterpolator, class TOutputInterpolator>
void ProlateInterpolateImageFunction<TInputImage, TBoundaryCondition, TCoordRep, TInputInterpolator, TOutputInterpolator>::PrintSelf(std::ostream& os,
itk::Indent indent) const
{
Superclass::PrintSelf(os, indent);
}
} // namespace otb
#endif
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