ITK/Examples/Smoothing/RGBCurvatureFlowImageFilter

RGBCurvatureFlowImageFilter.cxx

<source lang="cpp">

1. include "itkImageAdaptor.h"
2. include "itkImageRegionIterator.h"
3. include "itkNthElementImageAdaptor.h"
4. include "itkCurvatureFlowImageFilter.h"
5. include "itkComposeImageFilter.h"
6. include "itkImage.h"
7. include "itkImageFileReader.h"
8. include "itkRGBPixel.h"

1. include <sstream>

1. include "QuickView.h"

int main(int argc, char * argv[]) {

 // Verify command line arguments
 if( argc < 2 )
   {
   std::cerr << "Usage: " << std::endl;
   std::cerr << argv[0] << " InputImageFile [iterations]" << std::endl;
   return EXIT_FAILURE;
   }

 int iterations = 5;
 if (argc > 2)
   {
   std::stringstream ss(argv[2]);
   ss >> iterations;
   }
 std::string inputFilename = argv[1];

 // Setup types
 typedef float                                                    ComponentType;
 typedef itk::RGBPixel<ComponentType>                             PixelType;
 typedef itk::Image<PixelType, 2 >                                RGBImageType;
 typedef itk::Image<ComponentType, 2 >                            ImageType;
 typedef itk::ImageFileReader<RGBImageType>                       ReaderType;
 typedef itk::NthElementImageAdaptor<RGBImageType, unsigned char> ImageAdaptorType;
 typedef itk::ComposeImageFilter<ImageType, RGBImageType>         ComposeType;
 typedef itk::CurvatureFlowImageFilter<ImageAdaptorType, ImageType>  CurvatureFlowType;

 // Create and setup a reader
 ReaderType::Pointer reader = ReaderType::New();
 reader->SetFileName( inputFilename );
 reader->Update();

 // Run the filter for each component
 ImageAdaptorType::Pointer rAdaptor =
   ImageAdaptorType::New();
 rAdaptor->SelectNthElement(0);
 rAdaptor->SetImage(reader->GetOutput());

 CurvatureFlowType::Pointer rCurvatureFilter =
   CurvatureFlowType::New();
 rCurvatureFilter->SetInput(rAdaptor);
 rCurvatureFilter->SetNumberOfIterations(iterations);
 rCurvatureFilter->Update();
 
 ImageAdaptorType::Pointer gAdaptor =
   ImageAdaptorType::New();
 gAdaptor->SelectNthElement(1);
 gAdaptor->SetImage(reader->GetOutput());

 CurvatureFlowType::Pointer gCurvatureFilter =
   CurvatureFlowType::New();
 gCurvatureFilter->SetInput(gAdaptor);
 gCurvatureFilter->SetNumberOfIterations(iterations);
 gCurvatureFilter->Update();
 
 ImageAdaptorType::Pointer bAdaptor =
   ImageAdaptorType::New();
 bAdaptor->SelectNthElement(2);
 bAdaptor->SetImage(reader->GetOutput());

 CurvatureFlowType::Pointer bCurvatureFilter =
   CurvatureFlowType::New();
 bCurvatureFilter->SetInput(bAdaptor);
 bCurvatureFilter->SetNumberOfIterations(iterations);
 bCurvatureFilter->Update();

 // compose an RGB image from the three filtered images

 ComposeType::Pointer compose =  
   ComposeType::New();
 compose->SetInput1 (rCurvatureFilter->GetOutput());
 compose->SetInput2 (gCurvatureFilter->GetOutput());
 compose->SetInput3 (bCurvatureFilter->GetOutput());
 
 QuickView viewer;
 viewer.AddRGBImage(
   reader->GetOutput(),
   true,
   itksys::SystemTools::GetFilenameName(inputFilename));  

 std::stringstream desc;
 desc << "CurvatureFlow iterations = " << iterations;
 viewer.AddRGBImage(
   compose->GetOutput(),
   true,
   desc.str());  

 viewer.Visualize();

 return EXIT_SUCCESS;

} </source>

CMakeLists.txt

<syntaxhighlight lang="cmake"> cmake_minimum_required(VERSION 3.9.5)

project(RGBCurvatureFlowImageFilter)

find_package(ITK REQUIRED) include(${ITK_USE_FILE}) if (ITKVtkGlue_LOADED)

 find_package(VTK REQUIRED)
 include(${VTK_USE_FILE})

else()

 find_package(ItkVtkGlue REQUIRED)
 include(${ItkVtkGlue_USE_FILE})
 set(Glue ItkVtkGlue)

endif()

add_executable(RGBCurvatureFlowImageFilter MACOSX_BUNDLE RGBCurvatureFlowImageFilter.cxx) target_link_libraries(RGBCurvatureFlowImageFilter

 ${Glue}  ${VTK_LIBRARIES} ${ITK_LIBRARIES})

</syntaxhighlight>

Download and Build RGBCurvatureFlowImageFilter

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

cd RGBCurvatureFlowImageFilter/build 

• If ITK is installed:

cmake ..

• If ITK is not installed but compiled on your system, you will need to specify the path to your ITK build:

cmake -DITK_DIR:PATH=/home/me/itk_build ..

Build the project,

make

and run it:

./RGBCurvatureFlowImageFilter

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK and ITK bin directories to your path. This will resolve the VTK and ITK dll's at run time.

Building All of the Examples

Many of the examples in the ITK Wiki Examples Collection require VTK. You can build all of the the examples by following these instructions. If you are a new VTK user, you may want to try the Superbuild which will build a proper ITK and VTK.

ItkVtkGlue

ITK >= 4

For examples that use QuickView (which depends on VTK), you must have built ITK with Module_ITKVtkGlue=ON.

ITK < 4

Some of the ITK Examples require VTK to display the images. If you download the entire ITK Wiki Examples Collection, the ItkVtkGlue directory will be included and configured. If you wish to just build a few examples, then you will need to download ItkVtkGlue and build it. When you run cmake it will ask you to specify the location of the ItkVtkGlue binary directory.