ImageMedian3D
VTKExamples/Cxx/Images/ImageMedian3D
Question
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Code¶
ImageMedian3D.cxx
#include <vtkSmartPointer.h> #include <vtkImageData.h> #include <vtkImageCanvasSource2D.h> #include <vtkImageMedian3D.h> #include <vtkImageMapper3D.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkImageActor.h> #include <vtkImageCast.h> int main(int, char *[]) { // Create an image vtkSmartPointer<vtkImageCanvasSource2D> imageSource = vtkSmartPointer<vtkImageCanvasSource2D>::New(); imageSource->SetNumberOfScalarComponents(1); imageSource->SetScalarTypeToUnsignedChar(); unsigned int xmin = 0; unsigned int xmax = 20; unsigned int ymin = 0; unsigned int ymax = 20; imageSource->SetExtent(xmin, xmax, ymin, ymax, 0, 0); // Make the image all black imageSource->SetDrawColor(0.0); imageSource->FillBox(xmin, xmax, ymin, ymax); // Draw a big white square imageSource->SetDrawColor(255.0); imageSource->FillBox(5, 15, 5, 15); // Add some single white pixels imageSource->SetDrawColor(255.0); imageSource->FillBox(1, 1, 1, 1); imageSource->FillBox(17, 17, 17, 17); imageSource->Update(); vtkSmartPointer<vtkImageMedian3D> medianFilter = vtkSmartPointer<vtkImageMedian3D>::New(); medianFilter->SetInputConnection(imageSource->GetOutputPort()); medianFilter->SetKernelSize(3,3,1); medianFilter->Update(); // Create actors vtkSmartPointer<vtkImageActor> originalActor = vtkSmartPointer<vtkImageActor>::New(); originalActor->GetMapper()->SetInputConnection( imageSource->GetOutputPort()); vtkSmartPointer<vtkImageActor> medianActor = vtkSmartPointer<vtkImageActor>::New(); medianActor->GetMapper()->SetInputConnection( medianFilter->GetOutputPort()); // Define viewport ranges // (xmin, ymin, xmax, ymax) double leftViewport[4] = {0.0, 0.0, 0.5, 1.0}; double rightViewport[4] = {0.5, 0.0, 1.0, 1.0}; // Setup renderers vtkSmartPointer<vtkRenderer> originalRenderer = vtkSmartPointer<vtkRenderer>::New(); originalRenderer->SetViewport(leftViewport); originalRenderer->AddActor(originalActor); originalRenderer->ResetCamera(); originalRenderer->SetBackground(.4, .5, .6); vtkSmartPointer<vtkRenderer> gradientMagnitudeRenderer = vtkSmartPointer<vtkRenderer>::New(); gradientMagnitudeRenderer->SetViewport(rightViewport); gradientMagnitudeRenderer->AddActor(medianActor); gradientMagnitudeRenderer->ResetCamera(); gradientMagnitudeRenderer->SetBackground(.4, .5, .7); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300); renderWindow->AddRenderer(originalRenderer); renderWindow->AddRenderer(gradientMagnitudeRenderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); renderWindowInteractor->SetInteractorStyle(style); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindow->Render(); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(ImageMedian3D) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkImagingCore vtkImagingGeneral vtkImagingSources vtkInteractionStyle vtkRenderingContextOpenGL2 vtkRenderingCore vtkRenderingFreeType vtkRenderingGL2PSOpenGL2 vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping ImageMedian3D: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION: ${VTK_VERSION}") if (VTK_VERSION VERSION_LESS "8.90.0") # old system include(${VTK_USE_FILE}) add_executable(ImageMedian3D MACOSX_BUNDLE ImageMedian3D.cxx ) target_link_libraries(ImageMedian3D PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(ImageMedian3D MACOSX_BUNDLE ImageMedian3D.cxx ) target_link_libraries(ImageMedian3D PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS ImageMedian3D MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build ImageMedian3D¶
Click here to download ImageMedian3D and its CMakeLists.txt file. Once the tarball ImageMedian3D.tar has been downloaded and extracted,
cd ImageMedian3D/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:
./ImageMedian3D
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.