|
|
| Line 1: |
Line 1: |
| 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| | {{warning|1=The media wiki content on this page is no longer maintained.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|{{SUBPAGENAME}}}}
| |
