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| Create a structuring element (kernel) that can be used for any of the morphology filters.
| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
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| ==FlatStructuringElement.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| #include "itkBinaryErodeImageFilter.h"
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| #include "itkBinaryThresholdImageFilter.h"
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| #include <itkImageFileReader.h>
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| #include <itkBinaryBallStructuringElement.h>
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| #include <itkImageToVTKImageFilter.h>
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| #include "vtkImageViewer.h"
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| #include "vtkRenderWindowInteractor.h"
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| #include "vtkSmartPointer.h"
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| #include "vtkImageActor.h"
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| #include "vtkInteractorStyleImage.h"
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| #include "vtkRenderer.h"
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| int main(int argc, char *argv[])
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| { | |
| if(argc < 2)
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| {
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| std::cerr << "Required: filename" << std::endl;
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| return EXIT_FAILURE;
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| }
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| typedef itk::Image<unsigned char, 2> ImageType;
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName(argv[1]);
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| reader->Update();
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|
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| typedef itk::FlatStructuringElement<2> StructuringElementType;
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| StructuringElementType::RadiusType radius;
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| radius.Fill(3);
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| StructuringElementType structuringElement = StructuringElementType::Box(radius);
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| typedef itk::BinaryErodeImageFilter <ImageType, ImageType, StructuringElementType>
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| BinaryErodeImageFilterType;
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| BinaryErodeImageFilterType::Pointer erodeFilter
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| = BinaryErodeImageFilterType::New();
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| erodeFilter->SetInput(reader->GetOutput());
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| erodeFilter->SetKernel(structuringElement);
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| erodeFilter->SetErodeValue(255);
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| erodeFilter->Update();
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| // Visualize first image
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| typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
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| ConnectorType::Pointer originalConnector = ConnectorType::New();
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| originalConnector->SetInput(reader->GetOutput());
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| vtkSmartPointer<vtkImageActor> originalActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| originalActor->SetInput(originalConnector->GetOutput());
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| // Visualize padded image
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| ConnectorType::Pointer erodedConnector = ConnectorType::New();
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| erodedConnector->SetInput(erodeFilter->GetOutput());
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| vtkSmartPointer<vtkImageActor> erodedActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| erodedActor->SetInput(erodedConnector->GetOutput());
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| // There will be one render window
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| vtkSmartPointer<vtkRenderWindow> renderWindow =
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| vtkSmartPointer<vtkRenderWindow>::New();
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| renderWindow->SetSize(600, 300);
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| vtkSmartPointer<vtkRenderWindowInteractor> interactor =
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| vtkSmartPointer<vtkRenderWindowInteractor>::New();
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| interactor->SetRenderWindow(renderWindow);
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| | |
| // Define viewport ranges
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| // (xmin, ymin, xmax, ymax)
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| double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
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| double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
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| // Setup both renderers | |
| vtkSmartPointer<vtkRenderer> leftRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(leftRenderer);
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| leftRenderer->SetViewport(leftViewport);
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| leftRenderer->SetBackground(.6, .5, .4);
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| vtkSmartPointer<vtkRenderer> rightRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(rightRenderer);
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| rightRenderer->SetViewport(rightViewport);
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| rightRenderer->SetBackground(.4, .5, .6);
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| // Add the sphere to the left and the cube to the right
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| leftRenderer->AddActor(originalActor);
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| rightRenderer->AddActor(erodedActor);
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| leftRenderer->ResetCamera();
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| rightRenderer->ResetCamera();
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| renderWindow->Render();
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| vtkSmartPointer<vtkInteractorStyleImage> style =
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| vtkSmartPointer<vtkInteractorStyleImage>::New();
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| interactor->SetInteractorStyle(style);
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| interactor->Start();
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| return EXIT_SUCCESS;
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| }
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| </source>
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| | |
| ==CMakeLists.txt==
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| <source lang="cmake">
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| cmake_minimum_required(VERSION 2.6)
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| PROJECT(FlatStructuringElement)
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| include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)
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| FIND_PACKAGE(VTK REQUIRED)
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| INCLUDE(${VTK_USE_FILE})
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| FIND_PACKAGE(ITK REQUIRED)
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| INCLUDE(${ITK_USE_FILE})
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| ADD_EXECUTABLE(FlatStructuringElement FlatStructuringElement.cxx)
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| TARGET_LINK_LIBRARIES(FlatStructuringElement
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| vtkHybrid
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| ITKBasicFilters ITKCommon ITKIO)
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| </source>
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