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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 otbSpectralAngleDistanceImageFilter_hxx
#define otbSpectralAngleDistanceImageFilter_hxx
#include "otbSpectralAngleDistanceImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkProgressReporter.h"
#include "otbMacro.h"
#include "otbMath.h"
namespace otb
{
/**
* Constructor
*/
template <class TInputImage, class TOutputImage>
SpectralAngleDistanceImageFilter<TInputImage, TOutputImage>::SpectralAngleDistanceImageFilter()
{
m_ReferencePixel = 0;
}
template <class TInputImage, class TOutputImage>
void SpectralAngleDistanceImageFilter<TInputImage, TOutputImage>::BeforeThreadedGenerateData()
{
if (this->GetInput()->GetNumberOfComponentsPerPixel() == 1)
{
itkExceptionMacro(<< "Not valid input image : mono channel image gives a nul output image.");
}
}
template <class TInputImage, class TOutputImage>
void SpectralAngleDistanceImageFilter<TInputImage, TOutputImage>::ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread,
itk::ThreadIdType threadId)
{
if (m_ReferencePixel.Size() == 0)
{
itkExceptionMacro(<< "Reference pixel is not set!");
}
InputImageConstPointerType inputPtr = this->GetInput();
OutputImagePointerType outputPtr = this->GetOutput();
// inputPtr->UpdateOutputInformation();
// Check if the reference pixel size matches the input image number of components.
if (m_ReferencePixel.GetSize() != inputPtr->GetNumberOfComponentsPerPixel())
{
itkExceptionMacro(<< "Reference pixel size (" << m_ReferencePixel.GetSize() << " and input image pixel size (" << inputPtr->GetNumberOfComponentsPerPixel()
<< ") don't match!");
}
// Define the portion of the input to walk for this thread, using
// the CallCopyOutputRegionToInputRegion method allows for the input
// and output images to be different dimensions
InputImageRegionType inputRegionForThread;
this->CallCopyOutputRegionToInputRegion(inputRegionForThread, outputRegionForThread);
// Define the iterators
itk::ImageRegionConstIterator<InputImageType> inputIt(inputPtr, inputRegionForThread);
itk::ImageRegionIterator<OutputImageType> outputIt(outputPtr, outputRegionForThread);
itk::ProgressReporter progress(this, threadId, outputRegionForThread.GetNumberOfPixels());
inputIt.GoToBegin();
outputIt.GoToBegin();
while (!inputIt.IsAtEnd() && !outputIt.IsAtEnd())
{
double dist = 0.0;
double scalarProd = 0.0;
double normProd = 0.0;
double normProd1 = 0.0;
double normProd2 = 0.0;
InputPixelType pixel = inputIt.Get();
for (unsigned int i = 0; i < pixel.Size(); ++i)
{
scalarProd += pixel[i] * m_ReferencePixel[i];
normProd1 += pixel[i] * pixel[i];
normProd2 += m_ReferencePixel[i] * m_ReferencePixel[i];
}
normProd = normProd1 * normProd2;
if (normProd == 0.0)
{
dist = 0.0;
}
else
{
dist = std::acos(scalarProd / std::sqrt(normProd));
}
//------ This part was suppressed since the filter must perform only the spectral angle computation ---
// Spectral angle normalization
// dist = dist/(CONST_PI_2);
// square ponderation
// dist = std::sqrt(dist);
outputIt.Set(static_cast<OutputPixelType>(dist));
++inputIt;
++outputIt;
progress.CompletedPixel(); // potential exception thrown here
}
}
/**
* PrintSelf Method
*/
template <class TInputImage, class TOutputImage>
void SpectralAngleDistanceImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream& os, itk::Indent indent) const
{
Superclass::PrintSelf(os, indent);
}
} // End namespace otb
#endif
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