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
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.