ImageWeightedSum
VTKExamples/Cxx/ImageData/ImageWeightedSum
Description
Sum multiple images. Images must be of the same size and type.
Code
ImageWeightedSum.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageWeightedSum.h>
#include <vtkImageMapper3D.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageActor.h>
#include <vtkImageCast.h>
#include <vtkImageMandelbrotSource.h>
#include <vtkImageSinusoidSource.h>
int main(int, char *[])
{
//create an image
vtkSmartPointer<vtkImageMandelbrotSource> source1 =
vtkSmartPointer<vtkImageMandelbrotSource>::New();
source1->SetWholeExtent(0, 255, 0, 255, 0, 0);
source1->Update();
vtkSmartPointer<vtkImageCast> source1Double =
vtkSmartPointer<vtkImageCast>::New();
source1Double->SetInputConnection(0, source1->GetOutputPort());
source1Double->SetOutputScalarTypeToDouble();
vtkSmartPointer<vtkImageSinusoidSource> source2 =
vtkSmartPointer<vtkImageSinusoidSource>::New();
source2->SetWholeExtent(0, 255, 0, 255, 0, 0);
source2->Update();
vtkSmartPointer<vtkImageWeightedSum> sumFilter =
vtkSmartPointer<vtkImageWeightedSum>::New();
sumFilter->SetWeight(0,.8);
sumFilter->SetWeight(1,.2);
sumFilter->AddInputConnection(source1Double->GetOutputPort());
sumFilter->AddInputConnection(source2->GetOutputPort());
sumFilter->Update();
vtkSmartPointer<vtkImageCast> source1CastFilter =
vtkSmartPointer<vtkImageCast>::New();
source1CastFilter->SetInputConnection(source1->GetOutputPort());
source1CastFilter->SetOutputScalarTypeToUnsignedChar();
source1CastFilter->Update();
vtkSmartPointer<vtkImageCast> source2CastFilter =
vtkSmartPointer<vtkImageCast>::New();
source2CastFilter->SetInputConnection(source2->GetOutputPort());
source2CastFilter->SetOutputScalarTypeToUnsignedChar();
source2CastFilter->Update();
vtkSmartPointer<vtkImageCast> summedCastFilter =
vtkSmartPointer<vtkImageCast>::New();
summedCastFilter->SetInputConnection(sumFilter->GetOutputPort());
summedCastFilter->SetOutputScalarTypeToUnsignedChar();
summedCastFilter->Update();
// Create actors
vtkSmartPointer<vtkImageActor> source1Actor =
vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
source1Actor->SetInput(source1CastFilter->GetOutput());
#else
source1Actor->GetMapper()->SetInputConnection(source1CastFilter->GetOutputPort());
#endif
vtkSmartPointer<vtkImageActor> source2Actor =
vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
source2Actor->SetInput(source2CastFilter->GetOutput());
#else
source2Actor->GetMapper()->SetInputConnection(source2CastFilter->GetOutputPort());
#endif
vtkSmartPointer<vtkImageActor> summedActor =
vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
summedActor->SetInput(summedCastFilter->GetOutput());
#else
summedActor->GetMapper()->SetInputConnection(summedCastFilter->GetOutputPort());
#endif
// There will be one render window
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(600, 300);
// And one interactor
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
// Define viewport ranges
// (xmin, ymin, xmax, ymax)
double leftViewport[4] = {0.0, 0.0, 0.33, 1.0};
double centerViewport[4] = {0.33, 0.0, .66, 1.0};
double rightViewport[4] = {0.66, 0.0, 1.0, 1.0};
// Setup renderers
vtkSmartPointer<vtkRenderer> leftRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(leftRenderer);
leftRenderer->SetViewport(leftViewport);
leftRenderer->SetBackground(.6, .5, .4);
vtkSmartPointer<vtkRenderer> centerRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(centerRenderer);
centerRenderer->SetViewport(centerViewport);
centerRenderer->SetBackground(.1, .5, .4);
vtkSmartPointer<vtkRenderer> rightRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(rightRenderer);
rightRenderer->SetViewport(rightViewport);
rightRenderer->SetBackground(.4, .5, .6);
leftRenderer->AddActor(source1Actor);
centerRenderer->AddActor(source2Actor);
rightRenderer->AddActor(summedActor);
leftRenderer->ResetCamera();
centerRenderer->ResetCamera();
rightRenderer->ResetCamera();
renderWindow->Render();
interactor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ImageWeightedSum)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ImageWeightedSum MACOSX_BUNDLE ImageWeightedSum.cxx)
target_link_libraries(ImageWeightedSum ${VTK_LIBRARIES})
Download and Build ImageWeightedSum
Click here to download ImageWeightedSum and its CMakeLists.txt file. Once the tarball ImageWeightedSum.tar has been downloaded and extracted,
cd ImageWeightedSum/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:
./ImageWeightedSum
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.