# ImageOpenClose3D

VTKExamples/Cxx/Images/ImageOpenClose3D

### Description

This example reads a binary image and performs opening on one value and closing on another (morphological operations).

### Code

ImageOpenClose3D.cxx

    #include <vtkImageActor.h>
    #include <vtkImageMapper3D.h>
    #include <vtkImageCast.h>
    #include <vtkInteractorStyleImage.h>
    #include <vtkImageAccumulate.h>
    #include <vtkImageData.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkSmartPointer.h>
    #include <vtkPNGReader.h>
    #include <vtkImageOpenClose3D.h>
    #include <vtkImageThreshold.h>

    int main(int argc, char *argv[])
    {
      // Handle the arguments
      if(argc < 2)
      {
        std::cout << "Required arguments: filename.png" << std::endl;
        return EXIT_FAILURE;
      }

      // Read the image
      vtkSmartPointer<vtkPNGReader> reader =
        vtkSmartPointer<vtkPNGReader>::New();
      reader->SetFileName(argv[1]);
      reader->Update();

      vtkSmartPointer<vtkImageOpenClose3D> openClose =
        vtkSmartPointer<vtkImageOpenClose3D>::New();
      openClose->SetInputConnection(reader->GetOutputPort());
      openClose->SetOpenValue(0);
      openClose->SetCloseValue(255);
      openClose->SetKernelSize(5, 5, 3);
      openClose->ReleaseDataFlagOff();
      openClose->GetOutput();
      openClose->GetCloseValue();
      openClose->GetOpenValue();

      vtkSmartPointer<vtkImageActor> originalActor =
        vtkSmartPointer<vtkImageActor>::New();
      originalActor->GetMapper()->SetInputConnection(
        reader->GetOutputPort());

      vtkSmartPointer<vtkImageActor> openCloseActor =
        vtkSmartPointer<vtkImageActor>::New();
      openCloseActor->GetMapper()->SetInputConnection(
        openClose->GetOutputPort());

      // Define viewport ranges
      // (xmin, ymin, xmax, ymax)
      double originalViewport[4] = {0.0, 0.0, 0.5, 1.0};
      double openCloseViewport[4] = {0.5, 0.0, 1.0, 1.0};

      // Setup renderers
      vtkSmartPointer<vtkRenderer> originalRenderer =
        vtkSmartPointer<vtkRenderer>::New();
      originalRenderer->SetViewport(originalViewport);
      originalRenderer->AddActor(originalActor);
      originalRenderer->ResetCamera();
      originalRenderer->SetBackground(.4, .5, .6);

      vtkSmartPointer<vtkRenderer> openCloseRenderer =
        vtkSmartPointer<vtkRenderer>::New();
      openCloseRenderer->SetViewport(openCloseViewport);
      openCloseRenderer->AddActor(openCloseActor);
      openCloseRenderer->ResetCamera();
      openCloseRenderer->SetBackground(.4, .5, .7);

      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->SetSize(600, 300);
      renderWindow->AddRenderer(originalRenderer);
      renderWindow->AddRenderer(openCloseRenderer);

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

      renderWindowInteractor->SetInteractorStyle(style);

      renderWindowInteractor->SetRenderWindow(renderWindow);
      renderWindowInteractor->Initialize();

      renderWindowInteractor->Start();

      return  EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(ImageOpenClose3D)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(ImageOpenClose3D MACOSX_BUNDLE ImageOpenClose3D.cxx)

    target_link_libraries(ImageOpenClose3D ${VTK_LIBRARIES})

### Download and Build ImageOpenClose3D

Danger

The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.

Click here to download ImageOpenClose3D and its CMakeLists.txt file. Once the tarball ImageOpenClose3D.tar has been downloaded and extracted,

    cd ImageOpenClose3D/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./ImageOpenClose3D

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.