VTK/Examples/Cxx/Images/ImageAnisotropicDiffusion2D

#include <vtkSmartPointer.h>
 
#include <vtkCamera.h>
#include <vtkImageMapper3D.h>
#include <vtkImageActor.h>
#include <vtkImageAnisotropicDiffusion2D.h>
#include <vtkImageCast.h>
#include <vtkImageData.h>
#include <vtkImageMandelbrotSource.h>
#include <vtkInteractorStyleImage.h>
#include <vtkJPEGReader.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
 
int main(int argc, char *argv[])
{
   // Handle the arguments
  if(argc < 2)
    {
    std::cout << "Usage: " << argv[0]
              << " filename.png [iterations(10)] [threshold(20)]" << std::endl;
    return EXIT_FAILURE;
    }
  int iterations = 10;
  if (argc >= 3)
    {
    iterations = atoi(argv[2]);
    }
  float threshold = 20;
  if (argc >= 4)
    {
    threshold = atoi(argv[3]);
    }
  // Read the image
  vtkSmartPointer<vtkJPEGReader> reader =
    vtkSmartPointer<vtkJPEGReader>::New();
  reader->SetFileName(argv[1]);
 
  vtkSmartPointer<vtkImageAnisotropicDiffusion2D> diffusion =
    vtkSmartPointer<vtkImageAnisotropicDiffusion2D>::New();
  diffusion->SetInputConnection(reader->GetOutputPort());
  diffusion->SetNumberOfIterations(iterations);
  diffusion->SetDiffusionThreshold(threshold);
  diffusion->Update();
 
  // Create an actor
  vtkSmartPointer<vtkImageActor> originalActor =
    vtkSmartPointer<vtkImageActor>::New();
  originalActor->GetMapper()->SetInputConnection(reader->GetOutputPort());
 
  // Create an actor
  vtkSmartPointer<vtkImageActor> diffusionActor =
    vtkSmartPointer<vtkImageActor>::New();
  diffusionActor->GetMapper()->SetInputConnection(diffusion->GetOutputPort());
 
  // 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 renderers
  vtkSmartPointer<vtkCamera> camera =
    vtkSmartPointer<vtkCamera>::New();
  vtkSmartPointer<vtkRenderer> leftRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  leftRenderer->SetViewport(leftViewport);
  leftRenderer->AddActor(originalActor);
  leftRenderer->SetActiveCamera(camera);
  leftRenderer->ResetCamera();
 
  vtkSmartPointer<vtkRenderer> rightRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  rightRenderer->SetViewport(rightViewport);
  rightRenderer->AddActor(diffusionActor);
  rightRenderer->SetActiveCamera(camera);
 
  // Setup render window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600,300);
  renderWindow->AddRenderer(leftRenderer);
  renderWindow->AddRenderer(rightRenderer);
 
  // Setup render window interactor
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();
 
  renderWindowInteractor->SetInteractorStyle(style);
 
  // Render and start interaction
  renderWindowInteractor->SetRenderWindow(renderWindow);
  renderWindowInteractor->Initialize();
 
  renderWindowInteractor->Start();
  return EXIT_SUCCESS;
}