ITK/Examples/IO/ImportImageFilter

ImportImageFilter.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImportImageFilter.h"

1. include "itkImageFileWriter.h"

int main(int, char * []) {

 typedef unsigned char   PixelType;
 const unsigned int Dimension = 3;
 typedef itk::Image< PixelType, Dimension > ImageType;
 typedef itk::ImportImageFilter< PixelType, Dimension >   ImportFilterType;

 ImportFilterType::Pointer importFilter = ImportFilterType::New();

 ImportFilterType::SizeType  size;

 size[0]  = 200;  // size along X
 size[1]  = 200;  // size along Y
 size[2]  = 200;  // size along Z

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

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

 importFilter->SetRegion( region );

 double origin[ Dimension ];
 origin[0] = 0.0;    // X coordinate
 origin[1] = 0.0;    // Y coordinate
 origin[2] = 0.0;    // Z coordinate

 importFilter->SetOrigin( origin );

 double spacing[ Dimension ];
 spacing[0] = 1.0;    // along X direction
 spacing[1] = 1.0;    // along Y direction
 spacing[2] = 1.0;    // along Z direction

 importFilter->SetSpacing( spacing );

 const unsigned int numberOfPixels =  size[0] * size[1] * size[2];
 PixelType * localBuffer = new PixelType[ numberOfPixels ];

 const double radius = 80.0;

 const double radius2 = radius * radius;
 PixelType * it = localBuffer;

 for(unsigned int z=0; z < size[2]; z++)
   {
   const double dz = static_cast<double>( z ) - static_cast<double>(size[2])/2.0;
   for(unsigned int y=0; y < size[1]; y++)
     {
     const double dy = static_cast<double>( y ) - static_cast<double>(size[1])/2.0;
     for(unsigned int x=0; x < size[0]; x++)
       {
       const double dx = static_cast<double>( x ) - static_cast<double>(size[0])/2.0;
       const double d2 = dx*dx + dy*dy + dz*dz;
       *it++ = ( d2 < radius2 ) ? 255 : 0;
       }
     }
   }

 const bool importImageFilterWillOwnTheBuffer = true;
 importFilter->SetImportPointer( localBuffer, numberOfPixels,
                                 importImageFilterWillOwnTheBuffer );

 typedef itk::ImageFileWriter< ImageType > WriterType;
 WriterType::Pointer writer = WriterType::New();

 writer->SetFileName("test.png");

 writer->SetInput(  importFilter->GetOutput()  );
 writer->Update();

 return EXIT_SUCCESS;

}

</source>

CMakeLists.txt

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

project(ImportImageFilter)

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

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

endif()

add_executable(ImportImageFilter MACOSX_BUNDLE ImportImageFilter.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(ImportImageFilter ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(ImportImageFilter ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build ImportImageFilter

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

cd ImportImageFilter/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:

./ImportImageFilter

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.