ITK/Examples/Broken/SimpleOperations/MetaDataDictionary

Current output is:

ASimpleFloat  [UNKNOWN_PRINT_CHARACTERISTICS]
Key   = ASimpleFloat
Value = [UNKNOWN_PRINT_CHARACTERISTICS]

Data read from file:

There are two problems.

1) UNKNOWN_PRINT_CHARACTERISTICS should be replaced with 1.2. 

2) The data does not seem to be retrieved from the file.

MetaDataDictionary.cxx

<source lang="cpp">

1. include <itkImage.h>
2. include <itkMetaDataDictionary.h>
3. include <itkMetaDataObject.h>
4. include <itkImageRegionIterator.h>
5. include <itkImageFileWriter.h>
6. include <itkImageFileReader.h>

typedef itk::Image<unsigned char, 2> ImageType;

static void CreateImage(ImageType::Pointer image);

int main(int, char*[]) {

 // Create an image
 ImageType::Pointer image = ImageType::New();
 CreateImage(image);

 // Store some data in it
 itk::MetaDataDictionary dictionary;
 itk::EncapsulateMetaData<float>(dictionary,"ASimpleFloat",1.2);
 image->SetMetaDataDictionary(dictionary);

 // View all of the data
 dictionary.Print(std::cout);

 // View the data individually
 itk::MetaDataDictionary::Iterator itr = dictionary.Begin();
 
 while( itr != dictionary.End() )
   {
   std::cout << "Key   = " << itr->first << std::endl;
   std::cout << "Value = ";
   itr->second->Print( std::cout );
   std::cout << std::endl;
   ++itr;
   }

 // Write the image (and the data) to a file
 typedef  itk::ImageFileWriter< ImageType  > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("test.mhd");
 writer->SetInput(image);
 writer->Update();

 // Read the image (and data) from the file
 typedef itk::ImageFileReader<ImageType> ReaderType;
 ReaderType::Pointer reader = ReaderType::New();
 reader->SetFileName("test.mhd");

 // Display the data
 std::cout << "Data read from file:" << std::endl;
 reader->GetMetaDataDictionary().Print(std::cout);

 return EXIT_SUCCESS;

}

void CreateImage(ImageType::Pointer image) {

 ImageType::IndexType start;
 start.Fill(0);

 ImageType::SizeType size;
 size.Fill(10);

 ImageType::RegionType region;
 region.SetSize(size);
 region.SetIndex(start);

 image->SetRegions(region);
 image->Allocate();

 itk::ImageRegionIterator<ImageType> imageIterator(image,image->GetLargestPossibleRegion());

 while(!imageIterator.IsAtEnd())
   {
   imageIterator.Set(20);
   ++imageIterator;
   }

} </source>

CMakeLists.txt

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

project(MetaDataDictionary)

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

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

endif()

add_executable(MetaDataDictionary MACOSX_BUNDLE MetaDataDictionary.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(MetaDataDictionary ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(MetaDataDictionary ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build MetaDataDictionary

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

cd MetaDataDictionary/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:

./MetaDataDictionary

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.