ImageSeparableConvolution
VTKExamples/Cxx/Images/ImageSeparableConvolution
Description¶
Read in a binary image and convolve it with a separable kernel. The input and output are displayed.
Code¶
ImageSeparableConvolution.cxx
#include <vtkImageActor.h> #include <vtkFloatArray.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 <vtkImageSeparableConvolution.h> #include <vtkImageThreshold.h> int main(int argc, char *argv[]) { // Handle the arguments if( argc < 2 ) { std::cout << "Required arguments: BinaryImage.png" << std::endl; return EXIT_FAILURE; } // Read the image vtkSmartPointer<vtkPNGReader> reader = vtkSmartPointer<vtkPNGReader>::New(); reader->SetFileName(argv[1]); reader->Update(); vtkSmartPointer<vtkFloatArray> xKernel = vtkSmartPointer<vtkFloatArray>::New(); xKernel->SetNumberOfTuples(5); xKernel->SetNumberOfComponents(1); xKernel->SetValue(0,1); xKernel->SetValue(1,1); xKernel->SetValue(2,1); xKernel->SetValue(3,1); xKernel->SetValue(4,1); vtkSmartPointer<vtkImageSeparableConvolution> convolutionFilter = vtkSmartPointer<vtkImageSeparableConvolution>::New(); convolutionFilter->SetInputConnection(reader->GetOutputPort()); convolutionFilter->SetXKernel(xKernel); convolutionFilter->Update(); vtkSmartPointer<vtkImageActor> originalActor = vtkSmartPointer<vtkImageActor>::New(); originalActor->GetMapper()->SetInputConnection( reader->GetOutputPort()); vtkSmartPointer<vtkImageCast> convolutionCastFilter = vtkSmartPointer<vtkImageCast>::New(); convolutionCastFilter->SetInputConnection(convolutionFilter->GetOutputPort()); convolutionCastFilter->SetOutputScalarTypeToUnsignedChar(); convolutionCastFilter->Update(); vtkSmartPointer<vtkImageActor> convolutionActor = vtkSmartPointer<vtkImageActor>::New(); convolutionActor->GetMapper()->SetInputConnection( convolutionCastFilter->GetOutputPort()); // Define viewport ranges // (xmin, ymin, xmax, ymax) double originalViewport[4] = {0.0, 0.0, 0.5, 1.0}; double convolutionViewport[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> convolutionRenderer = vtkSmartPointer<vtkRenderer>::New(); convolutionRenderer->SetViewport(convolutionViewport); convolutionRenderer->AddActor(convolutionActor); convolutionRenderer->ResetCamera(); convolutionRenderer->SetBackground(.4, .5, .7); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300); renderWindow->AddRenderer(originalRenderer); renderWindow->AddRenderer(convolutionRenderer); 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(ImageSeparableConvolution) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageSeparableConvolution MACOSX_BUNDLE ImageSeparableConvolution.cxx) target_link_libraries(ImageSeparableConvolution ${VTK_LIBRARIES})
Download and Build ImageSeparableConvolution¶
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 ImageSeparableConvolution and its CMakeLists.txt file. Once the tarball ImageSeparableConvolution.tar has been downloaded and extracted,
cd ImageSeparableConvolution/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:
./ImageSeparableConvolution
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.