ImageIslandRemoval2D
VTKExamples/Cxx/Images/ImageIslandRemoval2D
Description¶
This example creates a small white square and a big white square. We want the ImageIslandRemoval2D to turn the small white square black and leave the big white square alone.
Code¶
ImageIslandRemoval2D.cxx
#include <vtkSmartPointer.h> #include <vtkImageData.h> #include <vtkImageMapper3D.h> #include <vtkImageCanvasSource2D.h> #include <vtkImageIslandRemoval2D.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkJPEGReader.h> #include <vtkImageActor.h> #include <vtkImageEllipsoidSource.h> #include <vtkImageCast.h> int main(int, char *[]) { // Create an image vtkSmartPointer<vtkImageCanvasSource2D> imageSource = vtkSmartPointer<vtkImageCanvasSource2D>::New(); imageSource->SetScalarTypeToUnsignedChar(); imageSource->SetNumberOfScalarComponents(1); imageSource->SetExtent(0, 200, 0, 200, 0, 0); // Blank the image imageSource->SetDrawColor(0.0); imageSource->FillBox(0,200,0,200); // Draw a small box imageSource->SetDrawColor(255.0); imageSource->FillBox(100, 105, 100, 105); // Draw a large box imageSource->SetDrawColor(255.0); imageSource->FillBox(150, 170, 150, 170); imageSource->Update(); vtkSmartPointer<vtkImageIslandRemoval2D> islandRemovalFilter = vtkSmartPointer<vtkImageIslandRemoval2D>::New(); islandRemovalFilter->SetAreaThreshold(50); islandRemovalFilter->SetIslandValue(255.0); islandRemovalFilter->SetReplaceValue(0.0); islandRemovalFilter->SetInputConnection(imageSource->GetOutputPort()); islandRemovalFilter->Update(); // Visualize vtkSmartPointer<vtkImageActor> originalActor = vtkSmartPointer<vtkImageActor>::New(); originalActor->GetMapper()->SetInputConnection(imageSource->GetOutputPort()); vtkSmartPointer<vtkImageActor> islandRemovalActor = vtkSmartPointer<vtkImageActor>::New(); islandRemovalActor->GetMapper()->SetInputConnection( islandRemovalFilter->GetOutputPort()); // Define viewport ranges // (xmin, ymin, xmax, ymax) double originalViewport[4] = {0.0, 0.0, 0.5, 1.0}; double islandRemovalViewport[4] = {0.5, 0.0, 1.0, 1.0}; // Setup renderers vtkSmartPointer<vtkRenderer> originalRenderer = vtkSmartPointer<vtkRenderer>::New(); originalRenderer->SetViewport(originalViewport); originalRenderer->AddActor(originalActor); originalRenderer->ResetCamera(); originalRenderer->SetBackground(.4, .5, .6); vtkSmartPointer<vtkRenderer> islandRemovalRenderer = vtkSmartPointer<vtkRenderer>::New(); islandRemovalRenderer->SetViewport(islandRemovalViewport); islandRemovalRenderer->AddActor(islandRemovalActor); islandRemovalRenderer->ResetCamera(); islandRemovalRenderer->SetBackground(.4, .5, .7); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300); renderWindow->AddRenderer(originalRenderer); renderWindow->AddRenderer(islandRemovalRenderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); renderWindowInteractor->SetInteractorStyle(style); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageIslandRemoval2D) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageIslandRemoval2D MACOSX_BUNDLE ImageIslandRemoval2D.cxx) target_link_libraries(ImageIslandRemoval2D ${VTK_LIBRARIES})
Download and Build ImageIslandRemoval2D¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ImageIslandRemoval2D and its CMakeLists.txt file. Once the tarball ImageIslandRemoval2D.tar has been downloaded and extracted,
cd ImageIslandRemoval2D/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./ImageIslandRemoval2D
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.