ImageHybridMedian2D
VTKExamples/Cxx/Images/ImageHybridMedian2D
Description¶
This example reads in an image and performs median filtering on it. The input and output are displayed.
Question
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Code¶
ImageHybridMedian2D.cxx
#include <vtkImageActor.h> #include <vtkImageCast.h> #include <vtkImageMapper3D.h> #include <vtkInteractorStyleImage.h> #include <vtkImageAccumulate.h> #include <vtkImageData.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkSmartPointer.h> #include <vtkPNGReader.h> #include <vtkImageHybridMedian2D.h> #include <vtkImageThreshold.h> int main(int argc, char *argv[]) { // Handle the arguments if( argc < 2 ) { std::cout << "Required arguments: filename.png" << std::endl; return EXIT_FAILURE; } // Read the image vtkSmartPointer<vtkPNGReader> reader = vtkSmartPointer<vtkPNGReader>::New(); reader->SetFileName(argv[1]); reader->Update(); vtkSmartPointer<vtkImageHybridMedian2D> hybridMedian = vtkSmartPointer<vtkImageHybridMedian2D>::New(); hybridMedian->SetInputConnection(reader->GetOutputPort()); vtkSmartPointer<vtkImageActor> originalActor = vtkSmartPointer<vtkImageActor>::New(); originalActor->GetMapper()->SetInputConnection(reader->GetOutputPort()); vtkSmartPointer<vtkImageActor> hybridMedianActor = vtkSmartPointer<vtkImageActor>::New(); hybridMedianActor->GetMapper()->SetInputConnection( hybridMedian->GetOutputPort()); // Define viewport ranges // (xmin, ymin, xmax, ymax) double originalViewport[4] = {0.0, 0.0, 0.5, 1.0}; double hybridMedianViewport[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> hybridMedianRenderer = vtkSmartPointer<vtkRenderer>::New(); hybridMedianRenderer->SetViewport(hybridMedianViewport); hybridMedianRenderer->AddActor(hybridMedianActor); hybridMedianRenderer->ResetCamera(); hybridMedianRenderer->SetBackground(.4, .5, .7); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300); renderWindow->AddRenderer(originalRenderer); renderWindow->AddRenderer(hybridMedianRenderer); 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(ImageHybridMedian2D) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkIOImage vtkImagingCore vtkImagingGeneral vtkImagingStatistics vtkInteractionStyle vtkRenderingContextOpenGL2 vtkRenderingCore vtkRenderingFreeType vtkRenderingGL2PSOpenGL2 vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping ImageHybridMedian2D: ${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(ImageHybridMedian2D MACOSX_BUNDLE ImageHybridMedian2D.cxx ) target_link_libraries(ImageHybridMedian2D PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(ImageHybridMedian2D MACOSX_BUNDLE ImageHybridMedian2D.cxx ) target_link_libraries(ImageHybridMedian2D PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS ImageHybridMedian2D MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build ImageHybridMedian2D¶
Click here to download ImageHybridMedian2D and its CMakeLists.txt file. Once the tarball ImageHybridMedian2D.tar has been downloaded and extracted,
cd ImageHybridMedian2D/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:
./ImageHybridMedian2D
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.