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/*
* Copyright (C) 2005-2017 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 otbBinaryImageDensityFunction_txx
#define otbBinaryImageDensityFunction_txx
#include "otbBinaryImageDensityFunction.h"
#include "itkConstNeighborhoodIterator.h"
namespace otb
{
/**
* Constructor
*/
template <class TInputImage, class TCoordRep>
BinaryImageDensityFunction<TInputImage, TCoordRep>
::BinaryImageDensityFunction()
{
m_NeighborhoodRadius.Fill(1);
}
/**
*
*/
template <class TInputImage, class TCoordRep>
void
BinaryImageDensityFunction<TInputImage, TCoordRep>
::PrintSelf(std::ostream& os, itk::Indent indent) const
{
this->Superclass::PrintSelf(os, indent);
os << indent << "NeighborhoodRadius: " << m_NeighborhoodRadius << std::endl;
}
/**
*
*/
template <class TInputImage, class TCoordRep>
typename BinaryImageDensityFunction<TInputImage, TCoordRep>
::RealType
BinaryImageDensityFunction<TInputImage, TCoordRep>
::EvaluateAtIndex(const IndexType& index) const
{
RealType sum;
RealType var;
sum = itk::NumericTraits<RealType>::Zero;
if (!this->GetInputImage())
{
return (itk::NumericTraits<RealType>::max());
}
if (!this->IsInsideBuffer(index))
{
return (itk::NumericTraits<RealType>::max());
}
// Create an N-d neighborhood kernel, using a zeroflux boundary condition
typename InputImageType::SizeType kernelSize = m_NeighborhoodRadius;
itk::ConstNeighborhoodIterator<InputImageType>
it(kernelSize, this->GetInputImage(), this->GetInputImage()->GetBufferedRegion());
// Set the iterator at the desired location
it.SetLocation(index);
// Walk the neighborhood
const unsigned int size = it.Size();
for (unsigned int i = 0; i < size; ++i)
{
const RealType value = static_cast<RealType>(it.GetPixel(i));
sum += value;
}
const RealType num = static_cast<RealType>(size);
var = sum / num;
return var;
}
} // end namespace otb
#endif
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