ITK/Examples/SimpleOperations/SetPixels

This example demonstrates how to set the value of individual pixels in an image.

SetPixels.cxx

<source lang="cpp">

1. include "itkImage.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"

int main(int, char *[]) {

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

 ImageType::RegionType region;
 ImageType::IndexType start;
 start[0] = 0;
 start[1] = 0;

 ImageType::SizeType size;
 size[0] = 200;
 size[1] = 300;

 region.SetSize(size);
 region.SetIndex(start);

 ImageType::Pointer image = ImageType::New();
 image->SetRegions(region);
 image->Allocate();

 // Set pixels in a square to one value
 for(unsigned int r = 20; r < 80; r++)
 {
     for(unsigned int c = 30; c < 100; c++)
     {
         ImageType::IndexType pixelIndex;
         pixelIndex[0] = r;
         pixelIndex[1] = c;

         image->SetPixel(pixelIndex, 255);
     }
 }

 // Set pixels in a different square to a different value
 for(unsigned int r = 100; r < 130; r++)
 {
     for(unsigned int c = 115; c < 160; c++)
     {
         ImageType::IndexType pixelIndex;
         pixelIndex[0] = r;
         pixelIndex[1] = c;

         image->SetPixel(pixelIndex, 125);
     }
 }

 typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
 ConnectorType::Pointer connector = ConnectorType::New();
 connector->SetInput(image);
 
 vtkSmartPointer<vtkImageActor> actor =
   vtkSmartPointer<vtkImageActor>::New();
 actor->SetInput(connector->GetOutput());

 // Visualize
 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;

} </source>

CMakeLists.txt

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

PROJECT(SetPixels)

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(SetPixels SetPixels.cxx) TARGET_LINK_LIBRARIES(SetPixels vtkHybrid ITKIO ITKBasicFilters ITKCommon )

</source>