ITK/Examples/SimpleOperations/WidthHeight

WidthHeight.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileReader.h"

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

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

 typedef itk::Image<float, 2>            ImageType;
 typedef itk::ImageFileReader<ImageType> ReaderType;

 ReaderType::Pointer reader = ReaderType::New();
 reader->SetFileName( argv[1] );
 reader->Update();

 std::cout << reader->GetOutput()->GetLargestPossibleRegion().GetSize()[0] << " "
           << reader->GetOutput()->GetLargestPossibleRegion().GetSize()[1] << std::endl;

 // An example image had w = 200 and h = 100 (it is wider than it is tall). The above output
 // 200 100
 // so w = GetSize()[0]
 // and h = GetSize()[1]

 // A pixel inside the region
 itk::Index<2> indexInside;
 indexInside[0] = 150;
 indexInside[1] = 50;
 std::cout << reader->GetOutput()->GetLargestPossibleRegion().IsInside(indexInside) << std::endl;

 // A pixel outside the region
 itk::Index<2> indexOutside;
 indexOutside[0] = 50;
 indexOutside[1] = 150;
 std::cout << reader->GetOutput()->GetLargestPossibleRegion().IsInside(indexOutside) << std::endl;

 // This means that the [0] component of the index is referencing the left to right (column) index
 // and the [1] component of Index is referencing the top to bottom (row) index

 return EXIT_SUCCESS;

} </source>

CMakeLists.txt

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

project(WidthHeight)

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

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

endif()

add_executable(WidthHeight MACOSX_BUNDLE WidthHeight.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(WidthHeight ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(WidthHeight ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build WidthHeight

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

cd WidthHeight/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:

./WidthHeight

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.