ITK/Examples/ImageProcessing/BinaryThresholdImageFilter

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.

BinaryThresholdImageFilter.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkBinaryThresholdImageFilter.h"
3. include <itkImageFileReader.h>

1. 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;

} </source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

PROJECT(BinaryThresholdImageFilter)

include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)

FIND_PACKAGE(VTK REQUIRED) INCLUDE(${VTK_USE_FILE})

FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(BinaryThresholdImageFilter BinaryThresholdImageFilter.cxx) TARGET_LINK_LIBRARIES(BinaryThresholdImageFilter vtkHybrid ITKBasicFilters ITKCommon ITKIO)

</source>