ITK/Examples/IO/RegisterTransform

Not all transforms are automatically available due to the transform factory mechanism in ITK. To register a non-default transform, you can use the procedure below. For example, if you want to read this file:

<source lang="text">

1. Insight Transform File V1.0
2. Transform 0

Transform: MatrixOffsetTransformBase_double_3_3 Parameters: 0.991654 0.00303429 0.0015616 -0.000274293 0.970948 0.261678 -0.00143037 -0.263587 0.953079 -0.546243 21.4937 -28.456 FixedParameters: -1.11311 -3.55441 16.6988 </source>

you must register MatrixOffsetTransformBase with the TransformFactory.

RegisterTransform.cxx

<source lang="cpp">

1. include "itkTransformFileReader.h"
2. include "itkTransformFactoryBase.h"
3. include "itkTransformFactory.h"
4. include "itkMatrixOffsetTransformBase.h"

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

 std::string fileName;
 if(argc == 1) // No arguments were provided
 {
   fileName = "test.tfm";
 }
 else
 {
   fileName = argv[1];
 }

 typedef itk::MatrixOffsetTransformBase< double, 3, 3 > MatrixOffsetTransformType;
 itk::TransformFactory<MatrixOffsetTransformType>::RegisterTransform();

1. if (ITK_VERSION_MAJOR == 4 && ITK_VERSION_MINOR >= 5) || ITK_VERSION_MAJOR > 4

 itk::TransformFileReaderTemplate<float>::Pointer reader =
   itk::TransformFileReaderTemplate<float>::New();

1. else

 itk::TransformFileReader::Pointer reader = itk::TransformFileReader::New();

1. endif

 reader->SetFileName(fileName);
 reader->Update();

 std::cout << *(reader->GetTransformList()->begin()) << std::endl;

 return EXIT_SUCCESS;

} </source>

CMakeLists.txt

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

project(RegisterTransform)

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

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

endif()

add_executable(RegisterTransform MACOSX_BUNDLE RegisterTransform.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(RegisterTransform ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(RegisterTransform ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build RegisterTransform

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

cd RegisterTransform/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:

./RegisterTransform

WINDOWS USERS PLEASE NOTE: Be sure to add the ITK bin directory to your path. This will resolve the 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.