ITK/Examples/Broken/EdgesAndGradients/CannyEdgeDetectionImageFilter: Difference between revisions

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How to set a reasonable Threshold for the output edges?
{{warning|1=The media wiki content on this page is no longer maintained.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.
}}


==CannyEdgeDetectionImageFilter.cxx==
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
<source lang="cpp">
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkCastImageFilter.h"
#include "itkCannyEdgeDetectionImageFilter.h"
 
#include "QuickView.h"
 
int main(int argc, char *argv[])
{
  if(argc < 2)
    {
    std::cerr << "Usage: " << argv[0]
              << " Filename [variance lower_threshold upper_threshold]"
              << std::endl;
    return EXIT_FAILURE;
    }
 
  double variance = 2.0;
  double upperThreshold = 0.0;
  double lowerThreshold = 0.0;
  if (argc > 2)
    {
    variance = atof(argv[2]);
    }
  if (argc > 3)
    {
    lowerThreshold = atof(argv[3]);
    }
  if (argc > 4)
    {
    upperThreshold = atof(argv[4]);
    }
 
  typedef itk::Image<double, 2>  DoubleImageType;
 
  typedef itk::ImageFileReader<DoubleImageType> ReaderType;
  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName(argv[1]);
 
  typedef itk::CannyEdgeDetectionImageFilter <DoubleImageType, DoubleImageType>
    CannyEdgeDetectionImageFilterType;
 
  CannyEdgeDetectionImageFilterType::Pointer cannyFilter
    = CannyEdgeDetectionImageFilterType::New();
  cannyFilter->SetInput(reader->GetOutput());
  cannyFilter->SetVariance( variance );
  cannyFilter->SetUpperThreshold( upperThreshold );
  cannyFilter->SetLowerThreshold( lowerThreshold );
 
  QuickView viewer;
  viewer.AddImage<DoubleImageType>(reader->GetOutput());
  viewer.AddImage<DoubleImageType>(cannyFilter->GetOutput());
  viewer.Visualize();
 
  return EXIT_SUCCESS;
}
</source>
 
{{ITKVTKCMakeLists|CannyEdgeDetectionImageFilter|}}

Latest revision as of 19:01, 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Warning: The media wiki content on this page is no longer maintained.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]