ImageGaussianSmooth

VTKExamples/Cxx/Images/ImageGaussianSmooth


Code

ImageGaussianSmooth.cxx

#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkImageGaussianSmooth.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageActor.h>
#include <vtkImageEllipsoidSource.h>
#include <vtkImageCast.h>

int main(int, char *[])
{
  // Create an image
  vtkSmartPointer<vtkImageEllipsoidSource> source =
    vtkSmartPointer<vtkImageEllipsoidSource>::New();
  source->SetWholeExtent(0, 20, 0, 20, 0, 0);
  source->SetCenter(10,10,0);
  source->SetRadius(3,4,0);
  source->Update();

  vtkSmartPointer<vtkImageGaussianSmooth> gaussianSmoothFilter = 
    vtkSmartPointer<vtkImageGaussianSmooth>::New();
  gaussianSmoothFilter->SetInputConnection(source->GetOutputPort());
  gaussianSmoothFilter->Update();

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

  vtkSmartPointer<vtkImageActor> smoothedActor =
    vtkSmartPointer<vtkImageActor>::New();
  smoothedActor->GetMapper()->SetInputConnection(
    gaussianSmoothFilter->GetOutputPort());

   // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double originalViewport[4] = {0.0, 0.0, 0.5, 1.0};
  double smoothedViewport[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> gradientMagnitudeRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  gradientMagnitudeRenderer->SetViewport(smoothedViewport);
  gradientMagnitudeRenderer->AddActor(smoothedActor);
  gradientMagnitudeRenderer->ResetCamera();
  gradientMagnitudeRenderer->SetBackground(.4, .5, .7);

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

  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(ImageGaussianSmooth)

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

add_executable(ImageGaussianSmooth MACOSX_BUNDLE ImageGaussianSmooth.cxx )

target_link_libraries(ImageGaussianSmooth ${VTK_LIBRARIES})

Download and Build ImageGaussianSmooth

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

cd ImageGaussianSmooth/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:

./ImageGaussianSmooth

WINDOWS USERS

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