VTK/Examples/Cxx/Images/ImageFFT

#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageFFT.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkJPEGReader.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<vtkImageFFT> fftFilter = 
    vtkSmartPointer<vtkImageFFT>::New();
  fftFilter->SetInputConnection(source->GetOutputPort());
  fftFilter->Update();
 
  vtkSmartPointer<vtkImageCast> fftCastFilter =
    vtkSmartPointer<vtkImageCast>::New();
  fftCastFilter->SetInputConnection(fftFilter->GetOutputPort());
  fftCastFilter->SetOutputScalarTypeToUnsignedChar();
  fftCastFilter->Update();
 
  // Create actors
  vtkSmartPointer<vtkImageActor> originalActor =
    vtkSmartPointer<vtkImageActor>::New();
  originalActor->GetMapper()->SetInputConnection(source->GetOutputPort());
 
  vtkSmartPointer<vtkImageActor> fftActor =
    vtkSmartPointer<vtkImageActor>::New();
  fftActor->GetMapper()->SetInputConnection(fftCastFilter->GetOutputPort());
 
  // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double originalViewport[4] = {0.0, 0.0, 0.5, 1.0};
  double fftViewport[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> fftRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  fftRenderer->SetViewport(fftViewport);
  fftRenderer->AddActor(fftActor);
  fftRenderer->ResetCamera();
  fftRenderer->SetBackground(.4, .5, .7);
 
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600, 300);
  renderWindow->AddRenderer(originalRenderer);
  renderWindow->AddRenderer(fftRenderer);
 
  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;
}