ITK/Examples/Segmentation/ContourExtractor2DImageFilter: Difference between revisions

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==ContourExtractor2DImageFilter.cxx==
{{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releasesIn many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}}
<source lang="cpp">
#include "itkImage.h"
#include "itkImageFileWriter.h"
#include "itkContourExtractor2DImageFilter.h"
#include "itkApproximateSignedDistanceMapImageFilter.h"
 
typedef itk::Image<unsigned char, 2>  UnsignedCharImageType;
typedef itk::Image<float, 2>  FloatImageType;
static void CreateImage(UnsignedCharImageType::Pointer image);
int main(int, char *[])
{
  UnsignedCharImageType::Pointer image = UnsignedCharImageType::New();
  CreateImage(image);
  typedef  itk::ApproximateSignedDistanceMapImageFilter< UnsignedCharImageType, FloatImageType  > ApproximateSignedDistanceMapImageFilterType;
  ApproximateSignedDistanceMapImageFilterType::Pointer approximateSignedDistanceMapImageFilter = ApproximateSignedDistanceMapImageFilterType::New();
  approximateSignedDistanceMapImageFilter->SetInput(image);
  approximateSignedDistanceMapImageFilter->SetInsideValue(255);
  approximateSignedDistanceMapImageFilter->SetOutsideValue(0);
  approximateSignedDistanceMapImageFilter->Update();
 
  typedef itk::ContourExtractor2DImageFilter <FloatImageType>
          ContourExtractor2DImageFilterType;
  ContourExtractor2DImageFilterType::Pointer contourExtractor2DImageFilter
          = ContourExtractor2DImageFilterType::New();
  contourExtractor2DImageFilter->SetInput(approximateSignedDistanceMapImageFilter->GetOutput());
  contourExtractor2DImageFilter->SetContourValue(0);
  contourExtractor2DImageFilter->Update();
 
  std::cout << "There are " << contourExtractor2DImageFilter->GetNumberOfOutputs() << " contours" << std::endl;
  for(unsigned int i = 0; i < contourExtractor2DImageFilter->GetNumberOfOutputs(); ++i)
    {
    std::cout << "Contour " << i << ": " << std::endl;
    ContourExtractor2DImageFilterType::VertexListType::ConstIterator vertexIterator =  
      contourExtractor2DImageFilter->GetOutput(i)->GetVertexList()->Begin();
    while(vertexIterator != contourExtractor2DImageFilter->GetOutput(i)->GetVertexList()->End())
      {
      std::cout << vertexIterator->Value() << std::endl;
      ++vertexIterator;
      }
    std::cout << std::endl;
    }
 
  return EXIT_SUCCESS;
}
   
void CreateImage(UnsignedCharImageType::Pointer image)
{
  // Create an image
  itk::Index<2> start;
  start.Fill(0);
   
  itk::Size<2> size;
  size.Fill(100);
   itk::ImageRegion<2> region(start, size);
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(0);
  // Create a line of white pixels
  for(unsigned int i = 40; i < 60; ++i)
    {
    itk::Index<2> pixel;
    pixel.Fill(i);
    image->SetPixel(pixel, 255);
    }
   
  // Create another line of pixels
  for(unsigned int i = 10; i < 20; ++i)
    {
    itk::Index<2> pixel;
    pixel[0] = 10;
    pixel[1] = i;
    image->SetPixel(pixel, 255);
    }
  typedef  itk::ImageFileWriter< UnsignedCharImageType  > WriterType;
  WriterType::Pointer writer = WriterType::New();
  writer->SetFileName("image.png");
  writer->SetInput(image);
  writer->Update();
}
 
</source>
 
{{ITKVTKCMakeLists|{{SUBPAGENAME}}}}

Latest revision as of 15:26, 7 June 2019

Warning: The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.