|
|
| (2 intermediate revisions by one other user not shown) |
| Line 1: |
Line 1: |
| <div class="floatcenter">[[File:ITK_Examples_Baseline_Iterators_TestConstantBoundaryCondition.png]]</div>
| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| At the boundaries of an image, a NeighborhoodIterator will point to invalid pixels. This example demonstrates one method of handling these cases. It simply returns a specified constant value for any invalid pixel.
| |
| | |
| ==ConstantBoundaryCondition.cxx==
| |
| <source lang="cpp">
| |
| #include "itkImage.h"
| |
| #include "itkImageFileReader.h"
| |
| #include "itkConstNeighborhoodIterator.h"
| |
| #include "itkConstantBoundaryCondition.h"
| |
| #include "itkImageRegionIterator.h"
| |
| | |
| #include <itkImageToVTKImageFilter.h>
| |
| | |
| #include "vtkImageViewer.h"
| |
| #include "vtkImageMapper3D.h"
| |
| #include "vtkRenderWindowInteractor.h"
| |
| #include "vtkSmartPointer.h"
| |
| #include "vtkImageActor.h"
| |
| #include "vtkInteractorStyleImage.h"
| |
| #include "vtkRenderer.h"
| |
| | |
| typedef itk::Image<unsigned char, 2> ImageType;
| |
| static void CreateImage(ImageType::Pointer image);
| |
| | |
| int main(int, char*[])
| |
| { | |
| ImageType::Pointer image = ImageType::New();
| |
| CreateImage(image);
| |
|
| |
| ImageType::SizeType regionSize;
| |
| regionSize[0] = 50;
| |
| regionSize[1] = 1;
| |
| | |
| ImageType::IndexType regionIndex;
| |
| regionIndex[0] = 0;
| |
| regionIndex[1] = 0;
| |
| | |
| ImageType::RegionType region;
| |
| region.SetSize(regionSize);
| |
| region.SetIndex(regionIndex);
| |
| | |
| ImageType::SizeType radius;
| |
| radius[0] = 1;
| |
| radius[1] = 1;
| |
| | |
| typedef itk::ConstantBoundaryCondition<ImageType> BoundaryConditionType;
| |
| itk::ConstNeighborhoodIterator<ImageType, BoundaryConditionType> iterator(radius, image,region);
| |
| | |
| while(!iterator.IsAtEnd())
| |
| {
| |
| for(unsigned int i = 0; i < 9; i++)
| |
| {
| |
| ImageType::IndexType index = iterator.GetIndex(i);
| |
| | |
| std::cout << "Index: " << index
| |
| << " Pixel: " << i << " = "
| |
| << (int)iterator.GetPixel(i) << std::endl;
| |
| }
| |
| ++iterator;
| |
| }
| |
| | |
| // Visualize
| |
| typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
| |
| ConnectorType::Pointer connector = ConnectorType::New();
| |
| connector->SetInput(image);
| |
| | |
| vtkSmartPointer<vtkImageActor> actor =
| |
| vtkSmartPointer<vtkImageActor>::New();
| |
| #if VTK_MAJOR_VERSION <= 5
| |
| actor->SetInput(connector->GetOutput());
| |
| #else
| |
| connector->Update();
| |
| actor->GetMapper()->SetInputData(connector->GetOutput());
| |
| #endif
| |
| | |
| 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 = 5;
| |
| unsigned int NumCols = 5;
| |
| size[0] = NumRows;
| |
| size[1] = NumCols;
| |
| | |
| region.SetSize(size);
| |
| region.SetIndex(start);
| |
| | |
| image->SetRegions(region); | |
| image->Allocate();
| |
| | |
| itk::ImageRegionIterator<ImageType> imageIterator(image,region);
| |
| | |
| // Set all pixels to white
| |
| while(!imageIterator.IsAtEnd())
| |
| {
| |
| imageIterator.Set(255);
| |
| ++imageIterator;
| |
| }
| |
| }
| |
| </source>
| |
| | |
| {{ITKVTKCMakeLists|ConstantBoundaryCondition|}}
| |
