ITK/Examples/Images/NeighborhoodOperatorImageFilter: Difference between revisions

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==NeighborhoodOperatorImageFilter.cxx==
{{warning|1=The media wiki content on this page is no longer maintainedThe examples presented on the https://itk.org/Wiki/*  pages likely require ITK version 4.13 or earlier releases.   In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.
<source lang="cpp">
}}
#include "itkImage.h"
#include "itkNeighborhoodOperatorImageFunction.h"
#include "itkNeighborhoodOperator.h"
#include "itkNeighborhoodAllocator.h"
#include "itkNeighborhoodOperatorImageFilter.h"
#include "itkRescaleIntensityImageFilter.h"
 
#include <itkImageToVTKImageFilter.h>
 
#include "vtkImageViewer.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"
 
typedef itk::Image<float, 2> FloatImageType;
 
void CreateImage(FloatImageType::Pointer image);
 
class CustomOperator
: public itk::NeighborhoodOperator<float, 2>
{
  // Count the number of valid neighbors and set the output pixel to that number.
  // What we should see is that the number of neighbors is constant in the "middle"
   // of the image and the number of neighbors is fewer on the edges.
 
  protected:
    CoefficientVector GenerateCoefficients();
 
    void Fill(const CoefficientVector &coeff)
    {
      //Superclass::FillCenteredDirectional(coeff);
    }
};
 
CustomOperator::CoefficientVector CustomOperator::GenerateCoefficients()
{
  std::cout << "Neighborhood size: " << this->GetSize() << std::endl;
  /*
  for(unsigned int i = 0; i < this->GetSize(); i++)
    {
    ImageType::PixelType pixel = this->GetElement(i);
    std::cout << "Pixel " << i << " : " << pixel << std::endl;
    }
  */
}
 
int main(int, char*[])
{
 
  FloatImageType::Pointer image = FloatImageType::New();
  CreateImage(image);
 
  CustomOperator customOperator;
 
  itk::NeighborhoodOperatorImageFilter<FloatImageType, FloatImageType>::Pointer filter
        = itk::NeighborhoodOperatorImageFilter<FloatImageType, FloatImageType>::New();
  filter->SetOperator(customOperator);
  filter->SetInput(image);
  filter->Update();
 
  // Visualize
  typedef itk::RescaleIntensityImageFilter< FloatImageType, itk::Image<unsigned char, 2> > RescaleFilterType;
  RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
  rescaleFilter->SetInput(filter->GetOutput());
  rescaleFilter->SetOutputMinimum(0);
  rescaleFilter->SetOutputMaximum(255);
 
  typedef itk::ImageToVTKImageFilter<itk::Image<unsigned char, 2> > ConnectorType;
  ConnectorType::Pointer connector = ConnectorType::New();
  connector->SetInput(rescaleFilter->GetOutput());
 
  vtkSmartPointer<vtkImageActor> actor =
    vtkSmartPointer<vtkImageActor>::New();
  actor->SetInput(connector->GetOutput());
 
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
 
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(renderer);
 
  renderer->AddActor(actor);
  renderer->ResetCamera();
 
  renderWindow->Render();
 
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();
 
  interactor->SetInteractorStyle(style);
 
  interactor->Start();
 
  return EXIT_SUCCESS;
}
 
void CreateImage(FloatImageType::Pointer image)
{
  // Create an image with 2 connected components
  FloatImageType::RegionType region;
  FloatImageType::IndexType start;
  start[0] = 0;
  start[1] = 0;
 
  FloatImageType::SizeType size;
  unsigned int NumRows = 200;
  unsigned int NumCols = 300;
  size[0] = NumRows;
  size[1] = NumCols;
 
  region.SetSize(size);
  region.SetIndex(start);
 
  image->SetRegions(region);
  image->Allocate();
 
  // Make a square
  for(unsigned int r = 20; r < 80; r++)
    {
      for(unsigned int c = 20; c < 80; c++)
        {
        FloatImageType::IndexType pixelIndex;
        pixelIndex[0] = r;
        pixelIndex[1] = c;
 
        image->SetPixel(pixelIndex, 15);
        }
    }
}
</source>
 
{{ITKVTKCMakeLists|NeighborhoodOperatorImageFilter|}}

Latest revision as of 16:18, 5 June 2019

Warning: The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.