otbFastNLMeansImageFilter.h

Go to the documentation of this file.

/*
 * 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 otbFastNLMeansImageFilter_h
#define otbFastNLMeansImageFilter_h
 
#include "itkImageToImageFilter.h"
 
namespace otb
{
 
template <class TInputImage, class TOutputImage>
class ITK_EXPORT NLMeansFilter : public itk::ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  typedef NLMeansFilter                                      Self;
  typedef itk::ImageToImageFilter<TInputImage, TOutputImage> Superclass;
  typedef itk::SmartPointer<Self>                            Pointer;
  typedef itk::SmartPointer<const Self>                      ConstPointer;
 
  typedef TInputImage  InImageType;
  typedef TOutputImage OutImageType;
 
  typedef typename InImageType::Pointer      InImagePointerType;
  typedef typename InImageType::ConstPointer InImageConstPointerType;
  typedef typename InImageType::RegionType   InRegionType;
  typedef typename InImageType::IndexType    InIndexType;
  typedef typename InImageType::SizeType     InSizeType;
  typedef typename InImageType::OffsetType   InOffsetType;
  typedef typename OutImageType::Pointer     OutImagePointerType;
  typedef typename OutImageType::RegionType  OutRegionType;
  typedef typename OutImageType::PixelType   OutPixelType;
  typedef typename OutImageType::SizeType    OutSizeType;
  typedef typename OutImageType::IndexType   OutIndexType;
 
  itkNewMacro(Self);
  itkTypeMacro(NLMeansFilter, ImageToImageFilter);
 
  void SetSigma(const float sigma)
  {
    m_Var = 2.0 * sigma * sigma;
  }
 
  void SetHalfWindowSize(const unsigned int hws)
  {
    m_HalfPatchSize.Fill(hws);
    // Update NormalizeDistance
    m_NormalizeDistance = (2 * hws + 1) * (2 * hws + 1) * m_CutoffDistance * m_CutoffDistance;
  }
 
  void SetHalfSearchSize(const unsigned int hss)
  {
    m_HalfSearchSize.Fill(hss);
  }
  void SetCutOffDistance(const float thresh)
  {
    m_CutoffDistance = thresh;
    // Update NormalizeDistance
    m_NormalizeDistance = (2 * m_HalfPatchSize[0] + 1) * (2 * m_HalfPatchSize[1] + 1) * m_CutoffDistance * m_CutoffDistance;
  }
 
protected:
  NLMeansFilter();
 
  ~NLMeansFilter() override = default;
 
  void ThreadedGenerateData(const OutRegionType& outputRegionForThread, itk::ThreadIdType itkNotUsed(threadId)) override;
 
  void GenerateInputRequestedRegion() override;
 
  std::tuple<InRegionType, int, int, int, int, bool> OutputRegionToInputRegion(const OutRegionType& outputRegion) const;
 
  void PrintSelf(std::ostream& os, itk::Indent indent) const override;
 
private:
  NLMeansFilter(const Self&) = delete;            // purposely not implemented
  NLMeansFilter& operator=(const Self&) = delete; // purposely not implemented
 
                            ) const;
 
                               ) const;
 
  // Define class attributes
  InSizeType m_HalfSearchSize{0,0};
  InSizeType m_HalfPatchSize{0,0};
  float      m_Var;
  float      m_CutoffDistance;
  float      m_NormalizeDistance; // cutoff**2 * windowSize**2
 
  static const int m_ROW = 1;
  static const int m_COL = 0;
};
} // end namespace otb
 
#ifndef OTB_MANUAL_INSTANTIATION
#include "otbFastNLMeansImageFilter.hxx"
#endif
 
#endif