ITK/Examples/ImageProcessing/ThresholdImageFilter: Difference between revisions

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<source lang="cpp">
<source lang="cpp">
#include "itkImage.h"
#include "itkImage.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkThresholdImageFilter.h"
#include "itkThresholdImageFilter.h"
#include <itkImageFileReader.h>
#include "itkImageFileReader.h"


#include <itkImageToVTKImageFilter.h>
#include "QuickView.h"


#include "vtkImageViewer.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"
typedef itk::Image<unsigned char, 2>  ImageType;


int main(int argc, char *argv[])
int main(int argc, char *argv[])
Line 23: Line 14:
   if(argc < 2)
   if(argc < 2)
     {
     {
     std::cerr << "Required: filename" << std::endl;
     std::cerr << "Usage: ";
    std::cerr << argv[0] << " inputImageFile [lowerThreshold] [upperThreshold]" << std::endl;
     return EXIT_FAILURE;
     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;
   typedef itk::ImageFileReader<ImageType> ReaderType;
   ReaderType::Pointer reader = ReaderType::New();
   ReaderType::Pointer reader = ReaderType::New();
   reader->SetFileName(argv[1]);
   reader->SetFileName(argv[1]);
  reader->Update();


   typedef itk::ThresholdImageFilter <ImageType>
   typedef itk::ThresholdImageFilter <ImageType>
          ThresholdImageFilterType;
    ThresholdImageFilterType;


   ThresholdImageFilterType::Pointer thresholdFilter
   ThresholdImageFilterType::Pointer thresholdFilter
          = ThresholdImageFilterType::New();
    = ThresholdImageFilterType::New();
   thresholdFilter->SetInput(reader->GetOutput());
   thresholdFilter->SetInput(reader->GetOutput());
   thresholdFilter->ThresholdBelow(100);
   thresholdFilter->ThresholdOutside(lowerThreshold, upperThreshold);
   thresholdFilter->SetOutsideValue(0);
   thresholdFilter->SetOutsideValue(0);
  thresholdFilter->Update();


   // Visualize first image
   QuickView viewer;
   typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
   viewer.AddImage<ImageType>(
  ConnectorType::Pointer originalConnector = ConnectorType::New();
    reader->GetOutput(),true,
  originalConnector->SetInput(reader->GetOutput());
     itksys::SystemTools::GetFilenameName(argv[1]));
 
   std::stringstream desc;
  vtkSmartPointer<vtkImageActor> originalActor =
   desc << "Threshold\nlower = " << lowerThreshold
     vtkSmartPointer<vtkImageActor>::New();
      << " upper = " << upperThreshold;
  originalActor->SetInput(originalConnector->GetOutput());
   viewer.AddImage<ImageType>(
 
     thresholdFilter->GetOutput(),
   // Visualize padded image
     true,
  ConnectorType::Pointer thresholdedConnector = ConnectorType::New();
     desc.str());
   thresholdedConnector->SetInput(thresholdFilter->GetOutput());
   viewer.Visualize();
 
  vtkSmartPointer<vtkImageActor> thresholdedActor =
    vtkSmartPointer<vtkImageActor>::New();
  thresholdedActor->SetInput(thresholdedConnector->GetOutput());
 
  // There will be one render window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600, 300);
 
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
   double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
 
  // Setup both renderers
  vtkSmartPointer<vtkRenderer> leftRenderer =
     vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(leftRenderer);
  leftRenderer->SetViewport(leftViewport);
  leftRenderer->SetBackground(.6, .5, .4);
 
  vtkSmartPointer<vtkRenderer> rightRenderer =
     vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(rightRenderer);
  rightRenderer->SetViewport(rightViewport);
  rightRenderer->SetBackground(.4, .5, .6);
 
  // Add the sphere to the left and the cube to the right
  leftRenderer->AddActor(originalActor);
  rightRenderer->AddActor(thresholdedActor);
 
  leftRenderer->ResetCamera();
  rightRenderer->ResetCamera();
 
  renderWindow->Render();
 
  vtkSmartPointer<vtkInteractorStyleImage> style =
     vtkSmartPointer<vtkInteractorStyleImage>::New();
  interactor->SetInteractorStyle(style);
 
   interactor->Start();


   return EXIT_SUCCESS;
   return EXIT_SUCCESS;
}
}
</source>
</source>


Revision as of 05:05, 22 December 2010

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.

ThresholdImageFilter.cxx

<source lang="cpp">

  1. include "itkImage.h"
  2. include "itkThresholdImageFilter.h"
  3. include "itkImageFileReader.h"
  1. include "QuickView.h"


int main(int argc, char *argv[]) { 

 if(argc < 2)
   {
   std::cerr << "Usage: ";
   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::ThresholdImageFilter <ImageType>
   ThresholdImageFilterType;

 ThresholdImageFilterType::Pointer thresholdFilter
   = ThresholdImageFilterType::New();
 thresholdFilter->SetInput(reader->GetOutput());
 thresholdFilter->ThresholdOutside(lowerThreshold, upperThreshold);
 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(ThresholdImageFilter)

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(ThresholdImageFilter ThresholdImageFilter.cxx) TARGET_LINK_LIBRARIES(ThresholdImageFilter vtkHybrid ITKBasicFilters ITKCommon ITKIO)

</source>

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