ITK/Examples/Functions/NeighborhoodOperatorImageFunction

NeighborhoodOperatorImageFunction.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkNeighborhoodOperatorImageFunction.h"
3. include "itkNeighborhoodOperator.h"
4. include "itkNeighborhoodAllocator.h"

1. include <itkImageToVTKImageFilter.h>

1. include "vtkImageViewer.h"
2. include "vtkRenderWindowInteractor.h"
3. include "vtkSmartPointer.h"
4. include "vtkImageActor.h"
5. include "vtkInteractorStyleImage.h"
6. include "vtkRenderer.h"

typedef itk::Image<unsigned char, 2> ImageType;

void CreateImage(ImageType::Pointer image);

class CustomOperator

public itk::NeighborhoodOperator<unsigned char, 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.

};

int main(int, char*[]) {

 ImageType::Pointer image = ImageType::New();
 CreateImage(image);

 //CustomOperator customOperator;
 //itkNeighborhoodOperatorImageFunction function;
 //function->SetOperator(customOperator);

 // Visualize
 typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
 ConnectorType::Pointer connector = ConnectorType::New();
 connector->SetInput(image);

 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(ImageType::Pointer image) {

 // Create an image with 2 connected components
 ImageType::RegionType region;
 ImageType::IndexType start;
 start[0] = 0;
 start[1] = 0;

 ImageType::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++)
     {
         ImageType::IndexType pixelIndex;
         pixelIndex[0] = r;
         pixelIndex[1] = c;

         image->SetPixel(pixelIndex, 15);
     }
 }

} </source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

PROJECT(NeighborhoodOperatorImageFunction)

include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)

FIND_PACKAGE(VTK REQUIRED) INCLUDE(${VTK_USE_FILE})

FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(NeighborhoodOperatorImageFunction NeighborhoodOperatorImageFunction.cxx) TARGET_LINK_LIBRARIES(NeighborhoodOperatorImageFunction vtkHybrid ITKNumerics ITKBasicFilters ITKCommon ITKIO)

</source>