/*=========================================================================
 *
 *  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 itkReconstructionByDilationImageFilter_h
#define itkReconstructionByDilationImageFilter_h

#include "itkReconstructionImageFilter.h"

#include "itkNumericTraits.h"
#include <functional>

namespace itk
{
/** \class ReconstructionByDilationImageFilter
 * \brief grayscale reconstruction by dilation of an image
 *
 * Reconstruction by dilation operates on a "marker" image and a "mask"
 * image, and is defined as the dilation of the marker image with
 * respect to the mask image iterated until stability.
 *
 * The marker image must be less than or equal to the mask image
 * (on a pixel by pixel basis).
 *
 * Geodesic morphology is described in Chapter 6.2 of Pierre Soille's
 * book "Morphological Image Analysis: Principles and Applications",
 * Second Edition, Springer, 2003.
 *
 * Algorithm implemented in this filter is based on algorithm described
 * by Kevin Robinson and  Paul F. Whelan in "Efficient Morphological
 * Reconstruction: A Downhill Filter", Pattern Recognition Letters, Volume
 * 25, Issue 15, November 2004, Pages 1759-1767.
 *
 * The algorithm, a description of the transform and some applications
 * can be found in "Morphological Grayscale Reconstruction in Image Analysis:
 * Applications and Efficient Algorithms", Luc Vincent, IEEE Transactions on
 * image processing, Vol. 2, April 1993.
 *
 * \author Richard Beare. Department of Medicine, Monash University,
 * Melbourne, Australia.
 *
 * \sa MorphologyImageFilter, GrayscaleDilateImageFilter, GrayscaleFunctionDilateImageFilter, BinaryDilateImageFilter, ReconstructionByErosionImageFilter,
OpeningByReconstructionImageFilter, ClosingByReconstructionImageFilter, ReconstructionImageFilter
 * \ingroup ImageEnhancement  MathematicalMorphologyImageFilters
 * \ingroup MathematicalMorphologyImageFilters
 * \ingroup ITKMathematicalMorphology
 */

template< typename TInputImage, typename TOutputImage >
class ReconstructionByDilationImageFilter:
  public ReconstructionImageFilter< TInputImage, TOutputImage, std::greater< typename TOutputImage::PixelType > >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(ReconstructionByDilationImageFilter);

  using Self = ReconstructionByDilationImageFilter;
  using Superclass = ReconstructionImageFilter<
    TInputImage, TOutputImage, std::greater< typename TOutputImage::PixelType > >;

  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  /** Some convenient type alias. */
  using MarkerImageType = TInputImage;
  using MarkerImagePointer = typename MarkerImageType::Pointer;
  using MarkerImageConstPointer = typename MarkerImageType::ConstPointer;
  using MarkerImageRegionType = typename MarkerImageType::RegionType;
  using MarkerImagePixelType = typename MarkerImageType::PixelType;
  using MaskImageType = TInputImage;
  using MaskImagePointer = typename MaskImageType::Pointer;
  using MaskImageConstPointer = typename MaskImageType::ConstPointer;
  using MaskImageRegionType = typename MaskImageType::RegionType;
  using MaskImagePixelType = typename MaskImageType::PixelType;
  using OutputImageType = TOutputImage;
  using OutputImagePointer = typename OutputImageType::Pointer;
  using OutputImageConstPointer = typename OutputImageType::ConstPointer;
  using OutputImageRegionType = typename OutputImageType::RegionType;
  using OutputImagePixelType = typename OutputImageType::PixelType;

  /** ImageDimension constants */
  static constexpr unsigned int MarkerImageDimension = TInputImage::ImageDimension;
  static constexpr unsigned int MaskImageDimension = TInputImage::ImageDimension;
  static constexpr unsigned int OutputImageDimension = TOutputImage::ImageDimension;

  /** Method for creation through the object factory. */
  itkNewMacro(Self);

  /** Runtime information support. */
  itkTypeMacro(ReconstructionByDilationImageFilter,
               ReconstructionImageFilter);

protected:
  ReconstructionByDilationImageFilter()
  {
    this->m_MarkerValue = NumericTraits< typename TOutputImage::PixelType >::NonpositiveMin();
  }

  ~ReconstructionByDilationImageFilter() override = default;
};
// end ReconstructionByDilationImageFilter
}

#endif
