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/*
* Copyright (C) 2005-2022 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 otbPointSetDensityGaussianFunction_hxx
#define otbPointSetDensityGaussianFunction_hxx
#include "otbPointSetDensityGaussianFunction.h"
#include "otbMath.h"
namespace otb
{
/**
* Evaluate
*/
template <class TPointSet, class TOutput>
typename PointSetDensityGaussianFunction<TPointSet, TOutput>::OutputType
PointSetDensityGaussianFunction<TPointSet, TOutput>::Evaluate(const InputType& input) const
{
double accu = 0;
double radiussq = m_Radius * m_Radius;
if (this->GetPointSet()->GetNumberOfPoints() != 0)
{
typedef typename TPointSet::PointsContainer::ConstIterator iteratorType;
iteratorType it = this->GetPointSet()->GetPoints()->Begin();
while (it != this->GetPointSet()->GetPoints()->End())
{
float distX = input[0] - it.Value()[0];
float distY = input[1] - it.Value()[1];
float distsq = distX * distX + distY * distY;
accu += std::exp(-distsq / radiussq / 2);
++it;
}
accu /= std::sqrt(2 * CONST_PI * radiussq);
}
return accu;
}
/**
* PrintSelf
*/
template <class TPointSet, class TOutput>
void PointSetDensityGaussianFunction<TPointSet, TOutput>::PrintSelf(std::ostream& os, itk::Indent indent) const
{
this->Superclass::PrintSelf(os, indent);
}
} // end namespace otb
#endif
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