JPEGReader

VTKEx/Cxx/IO/JPEGReader

Description¶

This example shows how to read a JPG image file.

Other languages

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code¶

JPEGReader.cxx

#include <vtkSmartPointer.h>
#include <vtkImageViewer2.h>
#include <vtkJPEGReader.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main(int argc, char* argv[])
{
  //Verify input arguments
  if ( argc != 2 )
  {
    std::cout << "Usage: " << argv[0]
              << " Filename(.jpeg/jpg) e.g. Pileated.jpg " << std::endl;
    return EXIT_FAILURE;
  }

  //Read the image
  vtkSmartPointer<vtkJPEGReader> jpegReader =
    vtkSmartPointer<vtkJPEGReader>::New();
  jpegReader->SetFileName ( argv[1] );

  // Visualize
  vtkSmartPointer<vtkImageViewer2> imageViewer =
    vtkSmartPointer<vtkImageViewer2>::New();
  imageViewer->SetInputConnection( jpegReader->GetOutputPort() );
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  imageViewer->SetupInteractor(renderWindowInteractor);
  imageViewer->Render();
  imageViewer->GetRenderer()->ResetCamera();
  imageViewer->Render();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(JPEGReader)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkIOImage
  vtkvtkInteractionImage
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping JPEGReader: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(JPEGReader MACOSX_BUNDLE JPEGReader.cxx )
  target_link_libraries(JPEGReader PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(JPEGReader MACOSX_BUNDLE JPEGReader.cxx )
  target_link_libraries(JPEGReader PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS JPEGReader
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build JPEGReader¶

Click here to download JPEGReader and its CMakeLists.txt file. Once the tarball JPEGReader.tar has been downloaded and extracted,

cd JPEGReader/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:

./JPEGReader

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.