mitkOtsuSegmentationFilter.cpp

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/*===================================================================

The Medical Imaging Interaction Toolkit (MITK)

Copyright (c) German Cancer Research Center,
Division of Medical and Biological Informatics.
All rights reserved.

This software is distributed WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE.

See LICENSE.txt or http://www.mitk.org for details.

===================================================================*/

#include "mitkOtsuSegmentationFilter.h"
#include "itkOtsuMultipleThresholdsImageFilter.h"
#include "mitkImageAccessByItk.h"
#include "mitkImageCast.h"

struct paramContainer
{
  paramContainer(unsigned int numThresholds, bool useValley, unsigned int numBins, mitk::Image::Pointer image)
    : m_NumberOfThresholds(numThresholds), m_ValleyEmphasis(useValley), m_NumberOfBins(numBins), m_Image(image)
  {
  }

  unsigned int m_NumberOfThresholds;
  bool m_ValleyEmphasis;
  unsigned int m_NumberOfBins;
  mitk::Image::Pointer m_Image;
};

template <typename TPixel, unsigned int VImageDimension>
void AccessItkOtsuFilter(const itk::Image<TPixel, VImageDimension> *itkImage, paramContainer params)
{
  typedef itk::Image<TPixel, VImageDimension> itkInputImageType;
  typedef itk::Image<mitk::OtsuSegmentationFilter::OutputPixelType, VImageDimension> itkOutputImageType;
  typedef itk::OtsuMultipleThresholdsImageFilter<itkInputImageType, itkOutputImageType> OtsuFilterType;

  typename OtsuFilterType::Pointer filter = OtsuFilterType::New();
  filter->SetNumberOfThresholds(params.m_NumberOfThresholds);
  filter->SetInput(itkImage);
  filter->SetValleyEmphasis(params.m_ValleyEmphasis);
  filter->SetNumberOfHistogramBins(params.m_NumberOfBins);

  try
  {
    filter->Update();
  }
  catch (...)
  {
    mitkThrow() << "itkOtsuFilter error.";
  }

  mitk::CastToMitkImage<itkOutputImageType>(filter->GetOutput(), params.m_Image);
  return;
}

namespace mitk
{
  OtsuSegmentationFilter::OtsuSegmentationFilter()
    : m_NumberOfThresholds(2), m_ValleyEmphasis(false), m_NumberOfBins(128)
  {
  }

  OtsuSegmentationFilter::~OtsuSegmentationFilter() {}
  void OtsuSegmentationFilter::GenerateData()
  {
    mitk::Image::ConstPointer mitkImage = GetInput();
    AccessByItk_n(mitkImage,
                  AccessItkOtsuFilter,
                  (paramContainer(m_NumberOfThresholds, m_ValleyEmphasis, m_NumberOfBins, this->GetOutput())));
  }
}