ImageOpenClose3D

Description¶

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

Question

If you have a question about this example, please use the VTK Discourse Forum

Code¶

ImageOpenClose3D.cxx

#include <vtkImageActor.h>
#include <vtkImageMapper3D.h>
#include <vtkImageOpenClose3D.h>
#include <vtkInteractorStyleImage.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPNGReader.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main(int argc, char* argv[])
{
  vtkNew<vtkNamedColors> colors;

  // Handle the arguments.
  if (argc < 2)
  {
    std::cout << "Required arguments: filename.png e.g. Yinyang.png"
              << std::endl;
    return EXIT_FAILURE;
  }

  // Read the image.
  vtkNew<vtkPNGReader> reader;
  reader->SetFileName(argv[1]);
  reader->Update();

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

  vtkNew<vtkImageActor> originalActor;
  originalActor->GetMapper()->SetInputConnection(reader->GetOutputPort());

  vtkNew<vtkImageActor> openCloseActor;
  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.
  vtkNew<vtkRenderer> originalRenderer;
  originalRenderer->SetViewport(originalViewport);
  originalRenderer->AddActor(originalActor);
  originalRenderer->ResetCamera();
  originalRenderer->SetBackground(colors->GetColor3d("Sienna").GetData());

  vtkNew<vtkRenderer> openCloseRenderer;
  openCloseRenderer->SetViewport(openCloseViewport);
  openCloseRenderer->AddActor(openCloseActor);
  openCloseRenderer->ResetCamera();
  openCloseRenderer->SetBackground(.4, .5, .7);
  openCloseRenderer->SetBackground(colors->GetColor3d("RoyalBlue").GetData());

  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetSize(600, 300);
  renderWindow->AddRenderer(originalRenderer);
  renderWindow->AddRenderer(openCloseRenderer);
  renderWindow->SetWindowName("ImageOpenClose3D");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  vtkNew<vtkInteractorStyleImage> style;

  renderWindowInteractor->SetInteractorStyle(style);

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

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(ImageOpenClose3D)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  IOImage
  ImagingMorphological
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "ImageOpenClose3D: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(ImageOpenClose3D MACOSX_BUNDLE ImageOpenClose3D.cxx )
  target_link_libraries(ImageOpenClose3D PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS ImageOpenClose3D
  MODULES ${VTK_LIBRARIES}
)

Download and Build ImageOpenClose3D¶

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

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