text: /*=========================================================================
   *
   *  Copyright Insight Software Consortium
   *
   *  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.txt
   *
   *  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 itkTobogganImageFilter_h
  #define itkTobogganImageFilter_h
  
  #include "itkImageToImageFilter.h"
  #include "itkConstNeighborhoodIterator.h"
  
  namespace itk
  {
  /** \class TobogganImageFilter
   * \brief toboggan image segmentation
   * The Toboggan segmentation takes a gradient magnitude image
   * as input and produces an (over-)segmentation of the image based
   * on connecting each pixel to a local minimum of gradient.  It is
   * roughly equivalent to a watershed segmentation of the lowest level.
   *
   * The output is a 4 connected labeled map of the image.
   * \ingroup Segmentation
   * \ingroup ITKWatersheds
   */
  
  template< typename TInputImage, typename TOutputImage = Image< IdentifierType, TInputImage::ImageDimension >  >
  class ITK_TEMPLATE_EXPORT TobogganImageFilter:
    public ImageToImageFilter<
      TInputImage,
      TOutputImage>
  {
  public:
    ITK_DISALLOW_COPY_AND_ASSIGN(TobogganImageFilter);
  
    /** Standard "Self" type alias.   */
    using Self = TobogganImageFilter;
  
    /** The type of input image.   */
    using InputImageType = TInputImage;
  
    /** Number of dimensions. */
    static constexpr unsigned int NDimensions = TInputImage::ImageDimension;
  
    /** The type of output image.   */
    using OutputImageType = TOutputImage;
  
    /** Output image pixel type. */
    using OutputImagePixelType = typename OutputImageType::PixelType;
  
    /** Input image pixel type. */
    using InputImagePixelType = typename InputImageType::PixelType;
  
    /** Dimension of the input and output images. */
    enum { ImageDimension = InputImageType::ImageDimension };
  
    /** Other convenient type alias   */
    using RegionType = typename InputImageType::RegionType;
    using SizeType = typename InputImageType::SizeType;
    using IndexType = typename InputImageType::IndexType;
    using InputImagePointer = typename InputImageType::Pointer;
    using InputImageConstPointer = typename InputImageType::ConstPointer;
    using OutputImagePointer = typename OutputImageType::Pointer;
  
    /** Standard super class type alias support */
    using Superclass = ImageToImageFilter< InputImageType, OutputImageType >;
  
    /** Typedef support for the input image scalar value type. */
    using ScalarType = typename InputImageType::PixelType;
  
    /** Smart pointer type alias support  */
    using Pointer = SmartPointer< Self >;
  
    /** Run-time type information (and related methods) */
    itkTypeMacro(TobogganImageFilter, ImageToImageFilter);
  
    /** Method for creation through the object factory. */
    itkNewMacro(Self);
  
    /** Standard process object method.  This filter is not multithreaded. */
    void GenerateData() override;
  
    void GenerateInputRequestedRegion() override;
  
    void EnlargeOutputRequestedRegion(DataObject *) override;
  
    /** Neighborhood iterator type */
    using NeighborhoodIteratorType = ConstNeighborhoodIterator<Image<float, 2> >;
  
  #ifdef ITK_USE_CONCEPT_CHECKING
    // Begin concept checking
    itkConceptMacro( LessThanComparableCheck,
                     ( Concept::LessThanComparable< InputImagePixelType > ) );
    itkConceptMacro( OStreamWritableCheck,
                     ( Concept::OStreamWritable< InputImagePixelType > ) );
    // End concept checking
  #endif
  
  protected:
    TobogganImageFilter();
    ~TobogganImageFilter() override {}
    void PrintSelf(std::ostream & os, Indent indent) const override;
  };                                   // end of class
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #include "itkTobogganImageFilter.hxx"
  #endif
  
  #endif
  