RGBToHSV
VTKExamples/Cxx/Images/RGBToHSV
Description¶
Convert RGB channels to HSV channels.
Code¶
RGBToHSV.cxx
#include <vtkImageData.h> #include <vtkImageMapper3D.h> #include <vtkSmartPointer.h> #include <vtkImageRGBToHSV.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkJPEGReader.h> #include <vtkImageActor.h> #include <vtkImageExtractComponents.h> #include <string> int main(int argc, char *argv[]) { // Verify command line arguments if(argc != 2) { std::cerr << "Required arguments: image" << std::endl; return EXIT_FAILURE; } std::string inputFilename = argv[1]; std::cout << "Reading file: " << inputFilename << std::endl; // Read JPG file vtkSmartPointer<vtkJPEGReader> reader = vtkSmartPointer<vtkJPEGReader>::New(); reader->SetFileName(inputFilename.c_str()); reader->Update(); vtkSmartPointer<vtkImageRGBToHSV> hsvFilter = vtkSmartPointer<vtkImageRGBToHSV>::New(); hsvFilter->SetInputConnection(reader->GetOutputPort()); hsvFilter->Update(); vtkSmartPointer<vtkImageExtractComponents> extractHueFilter = vtkSmartPointer<vtkImageExtractComponents>::New(); extractHueFilter->SetInputConnection(hsvFilter->GetOutputPort()); extractHueFilter->SetComponents(0); extractHueFilter->Update(); vtkSmartPointer<vtkImageExtractComponents> extractSaturationFilter = vtkSmartPointer<vtkImageExtractComponents>::New(); extractSaturationFilter->SetInputConnection(hsvFilter->GetOutputPort()); extractSaturationFilter->SetComponents(1); extractSaturationFilter->Update(); vtkSmartPointer<vtkImageExtractComponents> extractValueFilter = vtkSmartPointer<vtkImageExtractComponents>::New(); extractValueFilter->SetInputConnection(hsvFilter->GetOutputPort()); extractValueFilter->SetComponents(2); extractValueFilter->Update(); // Create actors vtkSmartPointer<vtkImageActor> inputActor = vtkSmartPointer<vtkImageActor>::New(); inputActor->GetMapper()->SetInputConnection( reader->GetOutputPort()); vtkSmartPointer<vtkImageActor> hActor = vtkSmartPointer<vtkImageActor>::New(); hActor->GetMapper()->SetInputConnection( extractHueFilter->GetOutputPort()); vtkSmartPointer<vtkImageActor> sActor = vtkSmartPointer<vtkImageActor>::New(); sActor->GetMapper()->SetInputConnection( extractSaturationFilter->GetOutputPort()); vtkSmartPointer<vtkImageActor> vActor = vtkSmartPointer<vtkImageActor>::New(); vActor->GetMapper()->SetInputConnection( extractValueFilter->GetOutputPort()); // Define viewport ranges // (xmin, ymin, xmax, ymax) double inputViewport[4] = {0.0, 0.0, 0.25, 1.0}; double hViewport[4] = {0.25, 0.0, 0.5, 1.0}; double sViewport[4] = {0.5, 0.0, 0.75, 1.0}; double vViewport[4] = {0.75, 0.0, 1.0, 1.0}; // Setup renderers vtkSmartPointer<vtkRenderer> inputRenderer = vtkSmartPointer<vtkRenderer>::New(); inputRenderer->SetViewport(inputViewport); inputRenderer->AddActor(inputActor); inputRenderer->ResetCamera(); inputRenderer->SetBackground(.4, .5, .9); vtkSmartPointer<vtkRenderer> hRenderer = vtkSmartPointer<vtkRenderer>::New(); hRenderer->SetViewport(hViewport); hRenderer->AddActor(hActor); hRenderer->ResetCamera(); hRenderer->SetBackground(.4, .5, .6); vtkSmartPointer<vtkRenderer> sRenderer = vtkSmartPointer<vtkRenderer>::New(); sRenderer->SetViewport(sViewport); sRenderer->AddActor(sActor); sRenderer->ResetCamera(); sRenderer->SetBackground(.4, .5, .7); vtkSmartPointer<vtkRenderer> vRenderer = vtkSmartPointer<vtkRenderer>::New(); vRenderer->SetViewport(vViewport); vRenderer->AddActor(vActor); vRenderer->ResetCamera(); vRenderer->SetBackground(.4, .5, .8); // Setup render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(1000, 250); renderWindow->AddRenderer(inputRenderer); renderWindow->AddRenderer(hRenderer); renderWindow->AddRenderer(sRenderer); renderWindow->AddRenderer(vRenderer); // Setup render window interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); renderWindowInteractor->SetInteractorStyle(style); // Render and start interaction renderWindowInteractor->SetRenderWindow(renderWindow); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(RGBToHSV) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(RGBToHSV MACOSX_BUNDLE RGBToHSV.cxx) target_link_libraries(RGBToHSV ${VTK_LIBRARIES})
Download and Build RGBToHSV¶
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 RGBToHSV and its CMakeLists.txt file. Once the tarball RGBToHSV.tar has been downloaded and extracted,
cd RGBToHSV/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:
./RGBToHSV
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.