Smooth Image Using Min Max Curvature Flow

Synopsis

Smooth an image using min/max curvature flow.

Results

input image

Input image.

../../../../_images/SmoothImageUsingMinMaxCurvatureFlow.png

Output In VTK Window

Code

C++

#include "itkImage.h"
#include "itkCastImageFilter.h"
#include "itkMinMaxCurvatureFlowImageFilter.h"
#include "itkSubtractImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"

#ifdef ENABLE_QUICKVIEW
#  include "QuickView.h"
#endif

int
main(int argc, char * argv[])
{
  if (argc < 2)
  {
    std::cerr << "Usage: " << argv[0];
    std::cerr << " inputImage [iterations]" << std::endl;
    return EXIT_FAILURE;
  }

  std::string inputFileName = argv[1];

  int iterations = 5;
  if (argc > 2)
  {
    std::stringstream ss(argv[2]);
    ss >> iterations;
  }
  std::string inputFilename = argv[1];

  using PixelType = float;
  constexpr unsigned int Dimension = 2;

  using ImageType = itk::Image<PixelType, Dimension>;
  using ReaderType = itk::ImageFileReader<ImageType>;
  using MinMaxCurvatureFlowImageFilterType = itk::MinMaxCurvatureFlowImageFilter<ImageType, ImageType>;
  using SubtractType = itk::SubtractImageFilter<ImageType>;

  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName(inputFilename);

  MinMaxCurvatureFlowImageFilterType::Pointer minMaxCurvatureFlowImageFilter =
    MinMaxCurvatureFlowImageFilterType::New();
  minMaxCurvatureFlowImageFilter->SetInput(reader->GetOutput());
  minMaxCurvatureFlowImageFilter->SetNumberOfIterations(iterations);
  minMaxCurvatureFlowImageFilter->SetTimeStep(0.125);

  SubtractType::Pointer diff = SubtractType::New();
  diff->SetInput1(reader->GetOutput());
  diff->SetInput2(minMaxCurvatureFlowImageFilter->GetOutput());

#ifdef ENABLE_QUICKVIEW
  QuickView viewer;
  viewer.AddImage(reader->GetOutput(), true, itksys::SystemTools::GetFilenameName(inputFilename));

  std::stringstream desc;
  desc << "MinMaxCurvatureFlow, iterations = " << iterations;
  viewer.AddImage(minMaxCurvatureFlowImageFilter->GetOutput(), true, desc.str());

  std::stringstream desc2;
  desc2 << "Original - Median";
  viewer.AddImage(diff->GetOutput(), true, desc2.str());

  viewer.Visualize();
#endif

  return EXIT_SUCCESS;
}

Classes demonstrated