ITK/Using ITK from .NET

This page describes how to use ITK from .NET.

1. Download CMake, ITK source code, and SWIG
2. Build ITK (see here for help)
3. Create the following CMakeLists.txt file:

   # File: CMakeLists.txt
   cmake_minimum_required(VERSION 2.8)
   
   project(ExampleWrapper)
   
   find_package(ITK REQUIRED)
   include(${ITK_USE_FILE})
   
   add_library(ExampleWrapper SHARED example.h example.hxx example_wrap.cxx)
   target_link_libraries(ExampleWrapper ${ITK_LIBRARIES})
   

4. Create the following example.h file:

   // File : example.h
   #ifndef __example_h
   #define __example_h
   
   #include <string>
   
   template<class TPixel, unsigned int VDimension>
   void SmoothImage(
       const std::string input, const std::string output, const double sigma
   );
   
   #include "example.hxx"
   
   #endif // __example_h
   

5. Create the following example.hxx file:

   #ifndef __example_hxx
   #define __example_hxx
   
   #include "example.h"
   
   #include "itkImage.h"
   #include "itkImageFileReader.h"
   #include "itkImageFileWriter.h"
   #include "itkSmoothingRecursiveGaussianImageFilter.h"
   
   template<class TPixel, unsigned int VDimension>
   void SmoothImage(
       const std::string input, const std::string output, const double sigma
   ) {
       // Read input
       typedef itk::Image<TPixel,VDimension> ImageType;
       typedef itk::ImageFileReader<ImageType> ReaderType;
       ReaderType::Pointer reader = ReaderType::New();
       reader->SetFileName(input);
       reader->Update();
   
       // Apply filter
       typedef itk::SmoothingRecursiveGaussianImageFilter<ImageType> FilterType;
       FilterType::Pointer filter = FilterType::New();
       filter->SetInput(reader->GetOutput());
       filter->SetSigma(sigma);
       filter->Update();
   
       // Write output
       typedef itk::ImageFileWriter<ImageType> WriterType;
       WriterType::Pointer writer = WriterType::New();
       writer->SetInput(filter->GetOutput());
       writer->SetFileName(output);
       writer->Update();
   }
   
   #endif // __example_hxx
   

6. Create the following example.i file (instructs SWIG how to generate the wrapper):

   // File : example.i
   %module example
   %include "std_string.i"
   
   %{
   #include "example.h"
   %}
   
   %include "example.h"
   
   %template(SmoothImageUC2)SmoothImage<unsigned char, 2>;
   %template(SmoothImageF2) SmoothImage<float, 2>;
   

7. Run SWIG using the following command: swig -c++ -csharp -dllimport ExampleWrapper example.i
8. Run CMake, configure and generate, build the project. The result should be ExampleWrapper.dll
9. Create the following runme.cs C# file:

   // File: runme.cs
   using System;
   
   public class runme {
       [STAThread()]
       static void Main() {
           try {
               example.SmoothImageUC2(
                   input: "C:/Temp/cthead1.png",
                   output: "C:/Temp/cthead1-smooth.png",
                   sigma: 5.0
               );
           } catch (Exception ex) {
               Console.WriteLine(ex);
           }
       }
   }
   

10. Build the C# executable. For Mono use the following: mcs -platform:x86 -target:exe -out:example.exe *.cs