ITK/Examples/ImageProcessing/MaskImageFilter

MaskImageFilter.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileReader.h"
3. include "itkMaskImageFilter.h"
4. include "itkRescaleIntensityImageFilter.h"

1. include <itkImageToVTKImageFilter.h>

1. include "vtkImageViewer.h"
2. include "vtkRenderWindowInteractor.h"
3. include "vtkSmartPointer.h"
4. include "vtkImageActor.h"
5. include "vtkInteractorStyleImage.h"
6. include "vtkRenderer.h"

typedef itk::Image<unsigned char, 2> ImageType;

void CreateHalfMask(ImageType::Pointer image, ImageType::Pointer mask);

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

 if(argc < 2)
   {
   std::cerr << "Required: filename" << std::endl;
   return EXIT_FAILURE;
   }

 typedef itk::ImageFileReader<ImageType> ReaderType;
 ReaderType::Pointer reader = ReaderType::New();
 reader->SetFileName(argv[1]);
 reader->Update();

 ImageType::Pointer mask = ImageType::New();
 CreateHalfMask(reader->GetOutput(), mask);
 
 typedef itk::MaskImageFilter< ImageType, ImageType > MaskFilterType;
 MaskFilterType::Pointer maskFilter = MaskFilterType::New();
 maskFilter->SetInput1(reader->GetOutput());
 maskFilter->SetInput2(mask);
 maskFilter->Update();;

 // Visualize original image
 typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
 
 ConnectorType::Pointer originalConnector = ConnectorType::New();
 originalConnector->SetInput(reader->GetOutput());
 vtkSmartPointer<vtkImageActor> originalActor =
   vtkSmartPointer<vtkImageActor>::New();
 originalActor->SetInput(originalConnector->GetOutput());

 // Visualize mask image
 typedef itk::RescaleIntensityImageFilter< ImageType, ImageType > RescaleFilterType;
 RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
 rescaleFilter->SetInput(mask);
 rescaleFilter->SetOutputMinimum(0);
 rescaleFilter->SetOutputMaximum(255);
 
 ConnectorType::Pointer maskConnector = ConnectorType::New();
 maskConnector->SetInput(rescaleFilter->GetOutput());

 vtkSmartPointer<vtkImageActor> maskActor =
   vtkSmartPointer<vtkImageActor>::New();
 maskActor->SetInput(maskConnector->GetOutput());

 // Visualize masked image
 ConnectorType::Pointer maskedConnector = ConnectorType::New();
 maskedConnector->SetInput(maskFilter->GetOutput());

 vtkSmartPointer<vtkImageActor> maskedActor =
   vtkSmartPointer<vtkImageActor>::New();
 maskedActor->SetInput(maskedConnector->GetOutput());

 // There will be one render window
 vtkSmartPointer<vtkRenderWindow> renderWindow =
   vtkSmartPointer<vtkRenderWindow>::New();
 renderWindow->SetSize(900, 300);

 vtkSmartPointer<vtkRenderWindowInteractor> interactor =
   vtkSmartPointer<vtkRenderWindowInteractor>::New();
 interactor->SetRenderWindow(renderWindow);

 // Define viewport ranges
 // (xmin, ymin, xmax, ymax)
 double leftViewport[4] = {0.0, 0.0, 0.33, 1.0};
 double centerViewport[4] = {0.33, 0.0, 0.66, 1.0};
 double rightViewport[4] = {0.66, 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);

 // Setup both renderers
 vtkSmartPointer<vtkRenderer> centerRenderer =
   vtkSmartPointer<vtkRenderer>::New();
 renderWindow->AddRenderer(centerRenderer);
 centerRenderer->SetViewport(centerViewport);
 centerRenderer->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);
 centerRenderer->AddActor(maskActor);
 rightRenderer->AddActor(maskedActor);

 leftRenderer->ResetCamera();
 centerRenderer->ResetCamera();
 rightRenderer->ResetCamera();

 renderWindow->Render();

 vtkSmartPointer<vtkInteractorStyleImage> style =
   vtkSmartPointer<vtkInteractorStyleImage>::New();

 interactor->SetInteractorStyle(style);

 interactor->Start();

 return EXIT_SUCCESS;

}

void CreateHalfMask(ImageType::Pointer image, ImageType::Pointer mask) {

 ImageType::RegionType region = image->GetLargestPossibleRegion();
 
 mask->SetRegions(region);
 mask->Allocate();

 ImageType::SizeType regionSize = region.GetSize();

 itk::ImageRegionIterator<ImageType> imageIterator(mask,region);

 // Make the left half of the mask white and the right half black
 while(!imageIterator.IsAtEnd())
 {
   if(imageIterator.GetIndex()[0] > regionSize[0] / 2)
       {
       imageIterator.Set(0);
       }
     else
       {
       imageIterator.Set(1);
       }

   ++imageIterator;
 }

} </source>

CMakeLists.txt

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

PROJECT(MaskImageFilter)

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

</source>