ITK/Examples/ImageProcessing/BinaryThresholdImageFilter

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ITK Examples Baseline ImageProcessing TestBinaryThresholdImageFilter.png

This example demonstrates how to threshold an image using a BinaryThresholdImageFilter. The output of this filter is binary - InsideValue if the pixel value falls inside the threshold window, or OutsideValue otherwise. The output shows the original image and the thresholded image.

Contents

BinaryThresholdImageFilter.cxx

#include "itkImage.h"
#include "itkBinaryThresholdImageFilter.h"
#include <itkImageFileReader.h>
 
#include "QuickView.h"
 
int main(int argc, char *argv[])
{
  if(argc < 2)
    { 
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0] << " inputImageFile [lowerThreshold] [upperThreshold]" << std::endl;
    return EXIT_FAILURE;
    }
 
  int lowerThreshold = 10;
  int upperThreshold = 30;
  if (argc > 2)
    {
    lowerThreshold = atoi(argv[2]);
    }
  if (argc > 3)
    {
    upperThreshold = atoi(argv[3]);
    }
 
  typedef itk::Image<unsigned char, 2>  ImageType;
  typedef itk::ImageFileReader<ImageType> ReaderType;
 
  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName(argv[1]);
 
  typedef itk::BinaryThresholdImageFilter <ImageType, ImageType>
    BinaryThresholdImageFilterType;
 
  BinaryThresholdImageFilterType::Pointer thresholdFilter
    = BinaryThresholdImageFilterType::New();
  thresholdFilter->SetInput(reader->GetOutput());
  thresholdFilter->SetLowerThreshold(lowerThreshold);
  thresholdFilter->SetUpperThreshold(upperThreshold);
  thresholdFilter->SetInsideValue(255);
  thresholdFilter->SetOutsideValue(0);
 
  QuickView viewer;
  viewer.AddImage<ImageType>(
    reader->GetOutput(),true,
    itksys::SystemTools::GetFilenameName(argv[1]));  
  std::stringstream desc;
  desc << "Threshold\nlower = " << lowerThreshold
       << " upper = " << upperThreshold;
  viewer.AddImage<ImageType>(
    thresholdFilter->GetOutput(),
    true,
    desc.str());
  viewer.Visualize();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
project(BinaryThresholdImageFilter)
 
find_package(ItkVtkGlue REQUIRED)
include(${ItkVtkGlue_USE_FILE})
 
add_executable(BinaryThresholdImageFilter BinaryThresholdImageFilter.cxx)
target_link_libraries(BinaryThresholdImageFilter
  ItkVtkGlue  ${VTK_LIBRARIES} ${ITK_LIBRARIES})

Building All of the Examples

Many of the examples in the ITK Wiki Examples Collection require VTK. You can build all of the the examples by following these instructions. If you are a new VTK user, you may want to try the Superbuild which will build a proper ITK and VTK.

ItkVtkGlue

If you download the entire ITK Wiki Examples Collection, the ItkVtkGlue directory will be included and configured. If you wish to just build a few examples, then you will need to download ItkVtkGlue and build it. When you run cmake it will ask you to specify the location of the ItkVtkGlue binary directory.

Retrieved from "http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/BinaryThresholdImageFilter"
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