ResizeImage
VTKExamples/Cxx/Images/ResizeImage
Description¶
Resize an image using a sinc interpolator. Without command line arguments, the example resize a synthetic image. A jpeg file can be passed on the command lines. The new dimensions can also be passed as well as an integer specifying the sinc interpolator. See {{VTKDoxygenURL|vtkImageSincInterpolator}} for details. A -1 turns off interpolation.
ImageResize maintains the physical size of the image.
Note
This example was inspired by a question asked by Qiang Wang.
Code¶
ResizeImage.cxx
#include <vtkImageResize.h> #include "vtkImageSincInterpolator.h" #include <vtkVersion.h> #include <vtkImageActor.h> #include <vtkImageCanvasSource2D.h> #include <vtkImageData.h> #include <vtkJPEGReader.h> #include <vtkImageMapper3D.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkSmartPointer.h> int main(int argc, char *argv[]) { vtkSmartPointer<vtkImageData> imageData; int newSize[2] = {200, 10}; int windowFunction = 0; // Verify input arguments if ( argc > 1 ) { //Read the image vtkSmartPointer<vtkJPEGReader> jpegReader = vtkSmartPointer<vtkJPEGReader>::New(); jpegReader->SetFileName ( argv[1] ); jpegReader->Update(); imageData = jpegReader->GetOutput(); if (argc >3) { newSize[0] = atoi(argv[2]); newSize[1] = atoi(argv[3]); } if (argc > 4) { windowFunction = atoi(argv[4]); } } else { vtkSmartPointer<vtkImageCanvasSource2D> canvasSource = vtkSmartPointer<vtkImageCanvasSource2D>::New(); canvasSource->SetExtent(0, 100, 0, 100, 0, 0); canvasSource->SetScalarTypeToUnsignedChar(); canvasSource->SetNumberOfScalarComponents(3); canvasSource->SetDrawColor(127, 127, 100); canvasSource->FillBox(0, 100, 0, 100); canvasSource->SetDrawColor(100, 255, 255); canvasSource->FillTriangle(10, 10, 25, 10, 25, 25); canvasSource->SetDrawColor(255, 100, 255); canvasSource->FillTube(75, 75, 0, 75, 5.0); canvasSource->Update(); imageData = canvasSource->GetOutput(); } vtkSmartPointer<vtkImageSincInterpolator> interpolator = vtkSmartPointer<vtkImageSincInterpolator>::New(); if (windowFunction >= 0 && windowFunction <= 10) { interpolator->SetWindowFunction(windowFunction); } vtkSmartPointer<vtkImageResize> resize = vtkSmartPointer<vtkImageResize>::New(); #if VTK_MAJOR_VERSION <= 5 resize->SetInput(imageData); #else resize->SetInputData(imageData); #endif resize->SetOutputDimensions(newSize[0], newSize[1], 1); resize->Update(); if (windowFunction < 0) { resize->InterpolateOff(); std::cout << "Using nearest neighbor interpolation" << std::endl;; } else { std::cout << "Using window function : " << interpolator->GetWindowFunctionAsString() << std::endl;; } // Create an image actor to display the image vtkSmartPointer<vtkImageActor> imageActor = vtkSmartPointer<vtkImageActor>::New(); imageActor->GetMapper()->SetInputConnection(resize->GetOutputPort()); // Setup renderer vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(imageActor); renderer->ResetCamera(); // Setup render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); // Setup render window interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); renderWindowInteractor->SetInteractorStyle(style); // Render and start interaction renderWindowInteractor->SetRenderWindow(renderWindow); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ResizeImage) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ResizeImage MACOSX_BUNDLE ResizeImage.cxx) target_link_libraries(ResizeImage ${VTK_LIBRARIES})
Download and Build ResizeImage¶
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 ResizeImage and its CMakeLists.txt file. Once the tarball ResizeImage.tar has been downloaded and extracted,
cd ResizeImage/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:
./ResizeImage
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.