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
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.