otbVectorImageToIntensityImageFilter.hxx

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/*
 * Copyright (C) 2005-2024 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 otbVectorImageToIntensityImageFilter_hxx
#define otbVectorImageToIntensityImageFilter_hxx
 
#include "otbVectorImageToIntensityImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkProgressReporter.h"
#include "otbMath.h"
 
namespace otb
{
template <class TInputImage, class TOutputImage>
VectorImageToIntensityImageFilter<TInputImage, TOutputImage>::VectorImageToIntensityImageFilter()
{
  this->DynamicMultiThreadingOn();
}
 
template <class TInputImage, class TOutputImage>
void VectorImageToIntensityImageFilter<TInputImage, TOutputImage>::DynamicThreadedGenerateData(const OutputImageRegionType& outputRegionForThread)
{
 
  InputImageConstPointerType inputPtr  = this->GetInput();
  OutputImagePointerType     outputPtr = this->GetOutput();
 
  // 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);
 
  inputIt.GoToBegin();
  outputIt.GoToBegin();
 
  while (!inputIt.IsAtEnd() && !outputIt.IsAtEnd())
  {
    double         sum   = 0.0;
    InputPixelType pixel = inputIt.Get();
    for (unsigned int i = 0; i < pixel.Size(); ++i)
    {
      sum += pixel[i];
    }
    sum /= pixel.Size();
 
    outputIt.Set(static_cast<OutputPixelType>(sum));
    ++inputIt;
    ++outputIt;
  }
}