ImageCheckerboard
VTKExamples/Cxx/Images/ImageCheckerboard
Description¶
This example compares two images using a checkerboard pattern.
Code¶
ImageCheckerboard.cxx
#include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkJPEGReader.h> #include <vtkSmartPointer.h> #include <vtkImageData.h> #include <vtkImageViewer2.h> #include <vtkImageCheckerboard.h> int main ( int argc, char* argv[] ) { // Verify input arguments if ( argc != 3 ) { std::cerr << "Usage: " << argv[0] << " Input1Filename Input2Filename" << std::endl; return EXIT_FAILURE; } // Parse input arguments std::string inputFilename1 = argv[1]; std::string inputFilename2 = argv[2]; // Read the images vtkSmartPointer<vtkJPEGReader> jPEGReader1 = vtkSmartPointer<vtkJPEGReader>::New(); jPEGReader1->SetFileName ( inputFilename1.c_str() ); vtkSmartPointer<vtkJPEGReader> jPEGReader2 = vtkSmartPointer<vtkJPEGReader>::New(); jPEGReader2->SetFileName ( inputFilename2.c_str() ); vtkSmartPointer<vtkImageCheckerboard> checkerboardFilter = vtkSmartPointer<vtkImageCheckerboard>::New(); checkerboardFilter->SetInputConnection(0, jPEGReader1->GetOutputPort()); checkerboardFilter->SetInputConnection(1, jPEGReader2->GetOutputPort()); checkerboardFilter->SetNumberOfDivisions(3,3,1); // Visualize vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkImageViewer2> imageViewer = vtkSmartPointer<vtkImageViewer2>::New(); imageViewer->SetInputConnection(checkerboardFilter->GetOutputPort()); imageViewer->SetupInteractor(renderWindowInteractor); imageViewer->GetRenderer()->ResetCamera(); imageViewer->GetRenderer()->SetBackground(1,0,0); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageCheckerboard) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageCheckerboard MACOSX_BUNDLE ImageCheckerboard.cxx) target_link_libraries(ImageCheckerboard ${VTK_LIBRARIES})
Download and Build ImageCheckerboard¶
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 Some tarballs may be missing or out-of-date.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 ImageCheckerboard and its CMakeLists.txt file. Once the tarball ImageCheckerboard.tar has been downloaded and extracted,
cd ImageCheckerboard/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:
./ImageCheckerboard
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.