ITK/Examples/Segmentation/OtsuMultipleThresholdsImageFilter: Difference between revisions

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(Created page with "<div class="floatcenter">File:ITK_Examples_Baseline_Segmentation_TestOtsuMultipleThresholdsImageFilter.png</div> ==OtsuMultipleThresholdsImageFilter.cxx== <source lang="cpp...")
 
(Deprecated content that is moved to sphinx)
 
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<div class="floatcenter">[[File:ITK_Examples_Baseline_Segmentation_TestOtsuMultipleThresholdsImageFilter.png]]</div>
{{warning|1=The media wiki content on this page is no longer maintained.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 releases.  In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.
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==OtsuMultipleThresholdsImageFilter.cxx==
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
 
<source lang="cpp">
 
#include "itkImage.h"
#include "itkOtsuMultipleThresholdsImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageRegionIterator.h"
#include "itkNumericTraits.h"
#include "itkLabelToRGBImageFilter.h"
 
#include "itksys/SystemTools.hxx"
#include <sstream>
 
#include "QuickView.h"
 
typedef unsigned char                  PixelType;
typedef itk::Image<PixelType, 2>      ImageType;
typedef itk::RGBPixel<unsigned char>  RGBPixelType;
typedef itk::Image<RGBPixelType, 2>    RGBImageType;
 
 
static void CreateImage(ImageType::Pointer image);
 
int main(int argc, char *argv[])
{
  unsigned int numberOfThresholds = 1;
  ImageType::Pointer image;
  if( argc < 2 )
    {
    image = ImageType::New();
    CreateImage(image.GetPointer());
    }
  else
    {
    typedef itk::ImageFileReader<ImageType> ReaderType;
    ReaderType::Pointer reader =
      ReaderType::New();
    reader->SetFileName(argv[1]);
    reader->Update();
    if (argc > 2)
      {
      numberOfThresholds = atoi(argv[2]);
      }
    image = reader->GetOutput();
    }
 
  typedef itk::OtsuMultipleThresholdsImageFilter <ImageType, ImageType>
          FilterType;
  FilterType::Pointer otsuFilter
          = FilterType::New();
  otsuFilter->SetInput(image);
  otsuFilter->SetNumberOfThresholds(numberOfThresholds);
  otsuFilter->Update(); // To compute threshold
 
  typedef itk::LabelToRGBImageFilter<ImageType, RGBImageType> RGBFilterType;
  RGBFilterType::Pointer colormapImageFilter = RGBFilterType::New();
  colormapImageFilter->SetInput(otsuFilter->GetOutput());
 
  QuickView viewer;
  viewer.AddImage(
    image.GetPointer(),true,
    argc > 1 ? itksys::SystemTools::GetFilenameName(argv[1]) : "Generated image");
 
  std::stringstream desc;
  desc << "Otsu Threshold\n"
      << otsuFilter->GetNumberOfThresholds()
      << " thresholds: ";
  FilterType::ThresholdVectorType thresholds = otsuFilter->GetThresholds();
  for (unsigned int i = 0; i < thresholds.size(); i++)
    {
    desc << itk::NumericTraits<FilterType::InputPixelType>::PrintType(thresholds[i]) << " ";
    }
 
  viewer.AddRGBImage(
    colormapImageFilter->GetOutput(),
    true,
    desc.str()); 
 
  viewer.Visualize();
 
  return EXIT_SUCCESS;
}
 
void CreateImage(ImageType::Pointer image)
{
  // Create an image
  ImageType::IndexType start;
  start.Fill(0);
 
  ImageType::SizeType size;
  size.Fill(100);
 
  ImageType::RegionType region;
  region.SetSize(size);
  region.SetIndex(start);
 
  image->SetRegions(region);
  image->Allocate();
 
  // Make the whole image white
  itk::ImageRegionIterator<ImageType> iterator(image,image->GetLargestPossibleRegion());
 
  /*
  //Create a square
  while(!iterator.IsAtEnd())
    {
    iterator.Set(255);
    ++iterator;
    }
  */
}
</source>
{{ITKVTKCMakeLists|{{SUBPAGENAME}}}}

Latest revision as of 20:53, 31 May 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.

[ITK Sphinx Examples]