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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| | {{warning|1=The media wiki content on this page is no longer maintained.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. |
| | }} |
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| ==CannyEdgeDetectionImageFilter.cxx==
| | [https://itk.org/ITKExamples[ITK Sphinx Examples]] |
| <source lang="cpp">
| |
| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| #include "itkCastImageFilter.h"
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| #include "itkCannyEdgeDetectionImageFilter.h"
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| | |
| #include "QuickView.h"
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| | |
| int main(int argc, char *argv[])
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| {
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| if(argc < 2)
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| {
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| std::cerr << "Usage: " << argv[0]
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| << " Filename [variance lower_threshold upper_threshold]"
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| << std::endl;
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| return EXIT_FAILURE;
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| }
| |
| | |
| double variance = 2.0;
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| double upperThreshold = 0.0;
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| double lowerThreshold = 0.0;
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| if (argc > 2)
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| {
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| variance = atof(argv[2]);
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| }
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| if (argc > 3)
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| {
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| lowerThreshold = atof(argv[3]);
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| }
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| if (argc > 4)
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| {
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| upperThreshold = atof(argv[4]);
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| }
| |
| | |
| typedef itk::Image<double, 2> DoubleImageType;
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| | |
| typedef itk::ImageFileReader<DoubleImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName(argv[1]);
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| | |
| typedef itk::CannyEdgeDetectionImageFilter <DoubleImageType, DoubleImageType>
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| CannyEdgeDetectionImageFilterType;
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| | |
| CannyEdgeDetectionImageFilterType::Pointer cannyFilter
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| = CannyEdgeDetectionImageFilterType::New();
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| cannyFilter->SetInput(reader->GetOutput());
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| cannyFilter->SetVariance( variance );
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| cannyFilter->SetUpperThreshold( upperThreshold );
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| cannyFilter->SetLowerThreshold( lowerThreshold );
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| | |
| QuickView viewer;
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| viewer.AddImage<DoubleImageType>(reader->GetOutput());
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| viewer.AddImage<DoubleImageType>(cannyFilter->GetOutput());
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| viewer.Visualize();
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| | |
| return EXIT_SUCCESS;
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| }
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| </source>
| |
| | |
| {{ITKVTKCMakeLists|CannyEdgeDetectionImageFilter|}}
| |
