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| This example demonstrates how to threshold an image using a ThresholdImageFilter, which offers few different types of thresholds. The output shows the original image and the thresholded image.
| | {{warning|1=The media wiki content on this page is no longer maintained.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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| ==ThresholdImageFilter.cxx==
| | [https://itk.org/ITKExamples[ITK Sphinx Examples]] |
| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkThresholdImageFilter.h"
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| #include "itkImageFileReader.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: ";
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| std::cerr << argv[0] << " inputImageFile [lowerThreshold] [upperThreshold]" << std::endl;
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| return EXIT_FAILURE;
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| }
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| int lowerThreshold = 10;
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| int upperThreshold = 30;
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| if (argc > 2)
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| {
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| lowerThreshold = atoi(argv[2]);
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| }
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| if (argc > 3)
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| {
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| upperThreshold = atoi(argv[3]);
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| }
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| typedef itk::Image<unsigned char, 2> ImageType;
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName(argv[1]);
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| typedef itk::ThresholdImageFilter <ImageType>
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| ThresholdImageFilterType;
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| ThresholdImageFilterType::Pointer thresholdFilter
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| = ThresholdImageFilterType::New();
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| thresholdFilter->SetInput(reader->GetOutput());
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| thresholdFilter->ThresholdOutside(lowerThreshold, upperThreshold);
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| thresholdFilter->SetOutsideValue(0);
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| QuickView viewer;
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| viewer.AddImage<ImageType>(
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| reader->GetOutput(),true,
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| itksys::SystemTools::GetFilenameName(argv[1]));
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| std::stringstream desc;
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| desc << "Threshold\nlower = " << lowerThreshold
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| << " upper = " << upperThreshold;
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| viewer.AddImage<ImageType>(
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| thresholdFilter->GetOutput(),
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| true,
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| desc.str());
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| viewer.Visualize();
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| return EXIT_SUCCESS;
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| }
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| </source>
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| ==CMakeLists.txt==
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| <source lang="cmake">
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| cmake_minimum_required(VERSION 2.6)
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| PROJECT(ThresholdImageFilter)
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| include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)
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| FIND_PACKAGE(VTK REQUIRED)
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| INCLUDE(${VTK_USE_FILE})
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| FIND_PACKAGE(ITK REQUIRED)
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| INCLUDE(${ITK_USE_FILE})
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| ADD_EXECUTABLE(ThresholdImageFilter ThresholdImageFilter.cxx)
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| TARGET_LINK_LIBRARIES(ThresholdImageFilter
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| vtkHybrid
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| ITKBasicFilters ITKCommon ITKIO)
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| </source>
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