# ImageNormalize

VTKExamples/Cxx/ImageData/ImageNormalize

Other Languages

See (Python), (Java)

### Code

ImageNormalize.cxx

    #include <vtkSmartPointer.h>
    #include <vtkImageData.h>
    #include <vtkImageMapper3D.h>
    #include <vtkImageSinusoidSource.h>
    #include <vtkImageNormalize.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkInteractorStyleImage.h>
    #include <vtkRenderer.h>
    #include <vtkImageActor.h>
    #include <vtkImageCast.h>

    int main(int, char *[])
    {
      // Create an image
      vtkSmartPointer<vtkImageSinusoidSource> source =
        vtkSmartPointer<vtkImageSinusoidSource>::New();
      source->Update();

      vtkSmartPointer<vtkImageNormalize> normalizeFilter =
        vtkSmartPointer<vtkImageNormalize>::New();

      normalizeFilter->SetInputConnection(source->GetOutputPort());
      normalizeFilter->Update();

      vtkSmartPointer<vtkImageCast> inputCastFilter =
        vtkSmartPointer<vtkImageCast>::New();
      inputCastFilter->SetInputConnection(source->GetOutputPort());
      inputCastFilter->SetOutputScalarTypeToUnsignedChar();
      inputCastFilter->Update();

      vtkSmartPointer<vtkImageCast> normalizeCastFilter =
        vtkSmartPointer<vtkImageCast>::New();
      normalizeCastFilter->SetInputConnection(normalizeFilter->GetOutputPort());
      normalizeCastFilter->SetOutputScalarTypeToUnsignedChar();
      normalizeCastFilter->Update();

      // Create actors
      vtkSmartPointer<vtkImageActor> inputActor =
        vtkSmartPointer<vtkImageActor>::New();
      inputActor->GetMapper()->SetInputConnection(
        inputCastFilter->GetOutputPort());

      vtkSmartPointer<vtkImageActor> normalizedActor =
        vtkSmartPointer<vtkImageActor>::New();
      normalizedActor->GetMapper()->SetInputConnection(
        normalizeCastFilter->GetOutputPort());

      // There will be one render window
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->SetSize(600, 300);

      // And one interactor
      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);

      leftRenderer->AddActor(inputActor);
      rightRenderer->AddActor(normalizedActor);

      leftRenderer->ResetCamera();

      rightRenderer->ResetCamera();

      renderWindow->Render();
      interactor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(ImageNormalize)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkImagingCore
      vtkImagingGeneral
      vtkImagingSources
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping ImageNormalize: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(ImageNormalize MACOSX_BUNDLE ImageNormalize.cxx )
      target_link_libraries(ImageNormalize PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(ImageNormalize MACOSX_BUNDLE ImageNormalize.cxx )
      target_link_libraries(ImageNormalize PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS ImageNormalize
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build ImageNormalize

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

    cd ImageNormalize/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:

    ./ImageNormalize

WINDOWS USERS

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