Colored2DImageFusion

VTKEx/Cxx/Images/Colored2DImageFusion

Description¶

This example use the vtkImageBlend class for a simple fusion of two 2D images with different color maps for each of the images.

Contributed by: Tim Hutz

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¶

Colored2DImageFusion.cxx

#include <vtkSmartPointer.h>

#include <vtkImageReader2Factory.h>
#include <vtkImageReader2.h>
#include <vtkActor.h>
#include <vtkDataSet.h>
#include <vtkDataSetMapper.h>
#include <vtkImageBlend.h>
#include <vtkImageData.h>
#include <vtkImageMapToColors.h>
#include <vtkLookupTable.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

int main(int argc, char *argv[])
{
  // Parse input arguments
  if ( argc < 3 )
  {
    std::cerr << "Usage: " << argv[0]
              << " Input1Filename Input2Filename" << std::endl;
    return EXIT_FAILURE;
  }

  vtkSmartPointer<vtkLookupTable> imgFirstColorMap =
    vtkSmartPointer<vtkLookupTable>::New(); // hot color map
  imgFirstColorMap->SetRange( 0.0, 255.0 );
  imgFirstColorMap->SetHueRange( 0.0, 0.1 );
  imgFirstColorMap->SetValueRange( 0.4, 0.8 );
  imgFirstColorMap->Build();

  vtkSmartPointer<vtkLookupTable> imgSecondColorMap =
      vtkSmartPointer<vtkLookupTable>::New(); // cold color map
  imgSecondColorMap->SetRange( 0.0, 255.0 );
  imgSecondColorMap->SetHueRange( 0.67, 0.68 );
  imgSecondColorMap->SetValueRange( 0.4, 0.8 );
  imgSecondColorMap->Build();

  vtkSmartPointer<vtkImageReader2Factory> readerFactory =
    vtkSmartPointer<vtkImageReader2Factory>::New();
  vtkSmartPointer<vtkImageReader2> imgReader;
  imgReader.TakeReference(
    readerFactory->CreateImageReader2(argv[1]));
  imgReader->SetFileName(argv[1]);

  vtkSmartPointer<vtkImageReader2> imgReaderMoving;
  imgReaderMoving.TakeReference(
    readerFactory->CreateImageReader2(argv[2]));
  imgReaderMoving->SetFileName(argv[2]);

  vtkSmartPointer<vtkImageMapToColors> firstColorMapper =
      vtkSmartPointer<vtkImageMapToColors>::New();
  firstColorMapper->SetInputConnection( imgReader->GetOutputPort() );
  firstColorMapper->SetLookupTable( imgFirstColorMap );

  vtkSmartPointer<vtkImageMapToColors> secondColorMapper =
      vtkSmartPointer<vtkImageMapToColors>::New();
  secondColorMapper->SetInputConnection( imgReaderMoving->GetOutputPort() );
  secondColorMapper->SetLookupTable( imgSecondColorMap );

  vtkSmartPointer<vtkImageBlend> imgBlender =
      vtkSmartPointer<vtkImageBlend>::New();
  imgBlender->SetOpacity( 0, 0.5 );
  imgBlender->SetOpacity( 1, 0.5 );
  imgBlender->AddInputConnection( firstColorMapper->GetOutputPort() );
  imgBlender->AddInputConnection( secondColorMapper->GetOutputPort() );

  vtkSmartPointer<vtkDataSetMapper> imgDataSetMapper =
      vtkSmartPointer<vtkDataSetMapper>::New();
  imgDataSetMapper->SetInputConnection(imgBlender->GetOutputPort());

  vtkSmartPointer<vtkActor> imgActor =
      vtkSmartPointer<vtkActor>::New();
  imgActor->SetMapper( imgDataSetMapper );

  vtkSmartPointer<vtkRenderer> imgRenderer =
      vtkSmartPointer<vtkRenderer>::New();
  imgRenderer->AddActor( imgActor );

  vtkSmartPointer<vtkRenderWindow> imgRenderWindow =
      vtkSmartPointer<vtkRenderWindow>::New();
  imgRenderWindow->AddRenderer( imgRenderer );

  vtkSmartPointer<vtkRenderWindowInteractor> imgInteractor =
      vtkSmartPointer<vtkRenderWindowInteractor>::New();
  imgInteractor->SetRenderWindow( imgRenderWindow );
  imgRenderWindow->Render();
  imgInteractor->Initialize();
  imgInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Colored2DImageFusion)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkIOImage
  vtkvtkImagingCore
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping Colored2DImageFusion: ${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(Colored2DImageFusion MACOSX_BUNDLE Colored2DImageFusion.cxx )
  target_link_libraries(Colored2DImageFusion PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(Colored2DImageFusion MACOSX_BUNDLE Colored2DImageFusion.cxx )
  target_link_libraries(Colored2DImageFusion PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS Colored2DImageFusion
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build Colored2DImageFusion¶

Click here to download Colored2DImageFusion and its CMakeLists.txt file. Once the tarball Colored2DImageFusion.tar has been downloaded and extracted,

cd Colored2DImageFusion/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:

./Colored2DImageFusion

WINDOWS USERS

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