1. ITK Architecture Kitware Inc.

2. ITK Basics C++ Generic Programming Data Pipeline Multi-threading Streaming Exceptions Events / Observers Tcl, Python and Java wrapping

3. Generic Programming Example: STL Standard Template Library Abstraction of Types and Behaviors std::vector

4. itk::Image itk::Image, 2 >

5. namespaces Avoid naming collisions itk:: itk::Statistics:: itk::fem:: itk::fem::itpack itk::bio

6. Your favorite keyword typedef typedef itk::Image ImageType typedef itk::ImageFilter FilterType otherwise... itk::ImageFilter, Image > FilterType

7. Smart Pointers Object Smart Pointer counter=0counter=1counter=2counter=3 Self - Delete

8. SmartPointers typedef itk::Image ImageType typedef itk::ImageFilter FilterType FilterType::Pointer filter = FilterType::New(); ImageType::Pointer image = filter->GetOutput(); NO NEED FOR filter->Delete(); Pointer notation filter->Update();

9. Const Correctness Knowing constancy is Insight. Not knowing constancy leads to disaster. Tao Te Ching, XVI. Lao Tsu

10. Const Smart Pointers typedef itk::Image ImageType typedef itk::ImageFilter FilterType FilterType::Pointer filter = FilterType::New(); ImageType::ConstPointer image = filter->GetOutput(); Can only invoke const methods image->GetSpacing (); Compiler error for non-const methods image->SetSpacing ( spacing );

11. Creating an Image typedef itk::Image ImageType ImageType::Pointer image = ImageType::New(); ImageType::SizeType size; size[ 0 ] = 512;// x direction size[ 1 ] = 512;// y direction size[ 2 ] = 50;// z direction ImageType::IndexType start; start[ 0 ] = 0; // x direction start[ 1 ] = 0; // y direction start[ 2 ] = 0; // z direction

12. Creating an Image ImageType::RegionType region; region.SetSize( size ); region.SetIndex( start ); image->SetRegions( region ); image->Allocate(); image->FillBuffer( 0 ); ImageType::SpacingType spacing; spacing[ 0 ] = 0.83; // x direction spacing[ 1 ] = 0.83; // y direction spacing[ 2 ] = 2.15; // z direction image->SetSpacing( spacing );

13. Exercise 3

14. Output Image Streaming Filter Processing Large Images Input Image

15. Image Regions LargestPossibleRegion BufferedRegion RequestedRegion

16. Data Pipeline Image Filter Image Filter Image Filter

17. Simple Image IO Image File ImageFileReader Image Filter Image File ImageFileWriter

18. CustomImageIO Simple Image IO Image File ImageFileReader Image PNGImageIO VTKImageIODICOMImageIOGIPLImageIO MetaImageIOAnalyzeImageIO Loadable Factories

19. Simple Image IO #include itkImage.h #include itkImageFileReader.h #include itkImageFileWriter.h typedef itk::Image ImageType; typedef itk::ImageFileReader ReaderType; typedef itk::ImageFileWriter WriterType; ReaderType::Pointer reader = ReaderType::New(); WriterType::Pointer writer = WriterType::New(); reader->SetFileName( inputImage.dcm ); // DICOM writer->SetFileName( outputImage.hdr ); // Analyze writer->SetInput( reader->GetOutput() ); writer->Update();

20. Exceptions Error Management ITK Layer Application Layer

21. Exceptions try { filter->Update(); } catch( itk::ExceptionObject & exp ) { std::cerr << exp << std::endl; }

22. Exercise 4 Image File ImageFileWriter Caster Image File ImageFileReader Filter

23. Events and Observers Itk::Object Itk::Command itk::Command Event

24. Events and Observers Common Events AnyEvent() StartEvent() EndEvent() ProgressEvent() IterationEvent()

25. Events and Observers Itk::Object Itk::ProcessObject Itk::FilterXY Itk::Command MyCommand Execute() AddObserver( ) AnyEvent MyEvent

26. Events and Observers Itk::Object Itk::ProcessObject Itk::FilterXY Itk::Command Itk::SimpleMemberCommand AddObserver( ) MyClass MethodX() AnyEvent MyEvent

27. Exercise 5 Image File ImageFileReaderFilterImageFileWriter Image File CommandObserver Execute() ProgressEvent() StartEvent() EndEvent()

28. GUI Communication ITK Layer GUI Layer Widget FilterX Callback Command FilterX Widget Observer

29. Enjoy ITK !