otbConvolutionImageFilter.h

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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 otbConvolutionImageFilter_h
#define otbConvolutionImageFilter_h
 
#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkNumericTraits.h"
#include "itkArray.h"
#include "itkZeroFluxNeumannBoundaryCondition.h"
 
namespace otb
{
template <class TInputImage, class TOutputImage, class TBoundaryCondition = itk::ZeroFluxNeumannBoundaryCondition<TInputImage>,
          class TFilterPrecision = typename itk::NumericTraits<typename TInputImage::InternalPixelType>::RealType>
class ITK_EXPORT ConvolutionImageFilter : public itk::ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  itkStaticConstMacro(InputImageDimension, unsigned int, TInputImage::ImageDimension);
  itkStaticConstMacro(OutputImageDimension, unsigned int, TOutputImage::ImageDimension);
 
  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;
 
  typedef ConvolutionImageFilter Self;
  typedef itk::ImageToImageFilter<InputImageType, OutputImageType> Superclass;
  typedef itk::SmartPointer<Self>       Pointer;
  typedef itk::SmartPointer<const Self> ConstPointer;
 
  itkNewMacro(Self);
 
  itkTypeMacro(ConvolutionImageFilter, ImageToImageFilter);
 
  typedef typename InputImageType::PixelType                    InputPixelType;
  typedef typename OutputImageType::PixelType                   OutputPixelType;
  typedef typename itk::NumericTraits<InputPixelType>::RealType InputRealType;
  typedef typename InputImageType::RegionType                   InputImageRegionType;
  typedef typename OutputImageType::RegionType                  OutputImageRegionType;
  typedef typename InputImageType::SizeType                     InputSizeType;
  typedef TFilterPrecision                                      FilterPrecisionType;
  typedef typename itk::Array<FilterPrecisionType>              ArrayType;
  typedef TBoundaryCondition                                    BoundaryConditionType;
 
  virtual void SetRadius(const InputSizeType rad)
  {
    itkDebugMacro("setting radius to " << rad);
    if (this->m_Radius != rad)
    {
      this->m_Radius         = rad;
      unsigned int arraySize = 1;
      for (unsigned int i = 0; i < m_Radius.GetSizeDimension(); ++i)
      {
        arraySize *= 2 * this->m_Radius[i] + 1;
      }
      this->m_Filter.SetSize(arraySize);
      this->m_Filter.Fill(1);
      this->Modified();
    }
  }
 
  itkGetConstReferenceMacro(Radius, InputSizeType);
 
  virtual void SetFilter(ArrayType filter)
  {
    if (filter.Size() != m_Filter.Size())
    {
      itkExceptionMacro("Error in SetFilter, invalid filter size:" << filter.Size() << " instead of (2*m_Radius[0]+1)*(2*m_Radius[1]+1): " << m_Filter.Size());
    }
    else
    {
      m_Filter = filter;
    }
    this->Modified();
  }
  itkGetConstReferenceMacro(Filter, ArrayType);
 
  itkSetMacro(NormalizeFilter, bool);
  itkGetMacro(NormalizeFilter, bool);
  itkBooleanMacro(NormalizeFilter);
 
#ifdef ITK_USE_CONCEPT_CHECKING
 
  itkConceptMacro(InputHasNumericTraitsCheck, (itk::Concept::HasNumericTraits<InputPixelType>));
 
#endif
 
protected:
  ConvolutionImageFilter();
  ~ConvolutionImageFilter() override
  {
  }
  void PrintSelf(std::ostream& os, itk::Indent indent) const override;
 
  void ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread, itk::ThreadIdType threadId) override;
 
  void GenerateInputRequestedRegion() override;
 
private:
  ConvolutionImageFilter(const Self&) = delete;
  void operator=(const Self&) = delete;
 
  InputSizeType m_Radius;
 
  ArrayType m_Filter;
 
  bool m_NormalizeFilter;
};
 
} // end namespace itk
 
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbConvolutionImageFilter.hxx"
#endif
 
#endif