CombineImages
VTKExamples/Cxx/Images/CombineImages
Description¶
This example takes two images and super imposes them. The opacity of each image can be set to control how they are combined.
Code¶
CombineImages.cxx
#include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkJPEGReader.h> #include <vtkImageData.h> #include <vtkSmartPointer.h> #include <vtkImageViewer2.h> #include <vtkImageBlend.h> #include <string> int main ( int argc, char* argv[] ) { // Parse input arguments if ( argc != 3 ) { std::cerr << "Usage: " << argv[0] << " Input1Filename Input2Filename" << std::endl; return EXIT_FAILURE; } std::string input1Filename = argv[1]; std::string input2Filename = argv[2]; // Read the images vtkSmartPointer<vtkJPEGReader> jPEGReader1 = vtkSmartPointer<vtkJPEGReader>::New(); jPEGReader1->SetFileName ( input1Filename.c_str() ); vtkSmartPointer<vtkJPEGReader> jPEGReader2 = vtkSmartPointer<vtkJPEGReader>::New(); jPEGReader2->SetFileName ( input2Filename.c_str() ); // Combine the images (blend takes multiple connections on the 0th input port) vtkSmartPointer<vtkImageBlend> blend = vtkSmartPointer<vtkImageBlend>::New(); blend->AddInputConnection(jPEGReader1->GetOutputPort()); blend->AddInputConnection(jPEGReader2->GetOutputPort()); blend->SetOpacity(0,.5); blend->SetOpacity(1,.5); // Display the result vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkImageViewer2> imageViewer = vtkSmartPointer<vtkImageViewer2>::New(); imageViewer->SetInputConnection(blend->GetOutputPort()); imageViewer->SetupInteractor(renderWindowInteractor); imageViewer->GetRenderer()->ResetCamera(); imageViewer->GetRenderer()->SetBackground(1,0,0); //red renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(CombineImages) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(CombineImages MACOSX_BUNDLE CombineImages.cxx) target_link_libraries(CombineImages ${VTK_LIBRARIES})
Download and Build CombineImages¶
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 Some tarballs may be missing or out-of-date.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 CombineImages and its CMakeLists.txt file. Once the tarball CombineImages.tar has been downloaded and extracted,
cd CombineImages/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:
./CombineImages
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.