otbLocalActivityVectorImageFilter.h

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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 otbLocalActivityVectorImageFilter_h
#define otbLocalActivityVectorImageFilter_h
 
#include "otbUnaryFunctorNeighborhoodVectorImageFilter.h"
 
#include <itkNumericTraits.h>
 
namespace otb
{
 
namespace Functor
{
template <class TInput, class TOutput>
class LocalActivityOperator
{
public:
  LocalActivityOperator()
  {
  }
  virtual ~LocalActivityOperator()
  {
  }
 
  TOutput operator()(const TInput& input)
  {
    /*
     * it is assumed that input and output have the same size
     */
    typename TInput::PixelType centerPixel = input.GetCenterPixel();
 
    unsigned int neighborSize = input.Size();
    unsigned int vectorSize   = centerPixel.Size();
 
    if (neighborSize == 1)
      return centerPixel;
 
    TOutput output(vectorSize);
 
    for (unsigned int i = 0; i < vectorSize; ++i)
    {
      typename TOutput::ValueType out = itk::NumericTraits<typename TOutput::ValueType>::Zero;
      for (unsigned int j = 0; j < neighborSize / 2; ++j)
      {
        out += input.GetPixel(j)[i];
      }
      for (unsigned int j = neighborSize / 2 + 1; j < neighborSize; ++j)
      {
        out += input.GetPixel(j)[i];
      }
 
      output[i] = centerPixel[i] - out / static_cast<double>(neighborSize - 1);
    }
 
    return output;
  }
}; // end of functor class
 
} // end of namespace Functor
 
template <class TInputImage, class TOutputImage>
class ITK_EXPORT LocalActivityVectorImageFilter
    : public UnaryFunctorNeighborhoodVectorImageFilter<
          TInputImage, TOutputImage, Functor::LocalActivityOperator<typename itk::ConstNeighborhoodIterator<TInputImage>, typename TOutputImage::PixelType>>
{
public:
  typedef LocalActivityVectorImageFilter Self;
  typedef UnaryFunctorNeighborhoodVectorImageFilter<
      TInputImage, TOutputImage, Functor::LocalActivityOperator<typename itk::ConstNeighborhoodIterator<TInputImage>, typename TOutputImage::PixelType>>
                                        Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;
 
  itkNewMacro(Self);
 
  itkTypeMacro(LocalActivityVectorImageFilter, ImageToImageFilter);
 
protected:
  LocalActivityVectorImageFilter() = default;
  ~LocalActivityVectorImageFilter() = default;
 
private:
  LocalActivityVectorImageFilter(const Self&); // Not implemented
  void operator=(const Self&);                 // Not implemented
};                                             // end of class
 
} // end of namespace otb
 
 
#endif // otbLocalActivityVectorImageFilter_h