ITK/Examples/VectorImages/VectorImage

This example demonstrates how to create an image with vector valued pixels. This is very similar to

typedef itk::Image<itk::CovariantVector<float,2> > ImageType;

but the difference is that the dimensionality of the pixels of a itkVectorImage can be determined at runtime, when the dimensionality of an itk::Image<itk::CovariantVector<pixeltype,pixeldimension> > must be determined at compile time.

VectorImage.cxx

<source lang="cpp">

1. include "itkVectorImage.h"

int main(int, char *[]) {

 // Create an image
 typedef itk::VectorImage<float, 2>  ImageType;

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

 ImageType::SizeType size;
 size.Fill(2);

 ImageType::RegionType region(start,size);

 ImageType::Pointer image = ImageType::New();
 image->SetRegions(region);
 image->SetVectorLength(2);
 image->Allocate();

 ImageType::IndexType pixelIndex;
 pixelIndex[0] = 1;
 pixelIndex[1] = 1;

 ImageType::PixelType pixelValue = image->GetPixel(pixelIndex);

 std::cout << "pixel (1,1) = " << pixelValue << std::endl;

 typedef itk::VariableLengthVector<double> VariableVectorType;
 VariableVectorType variableLengthVector;
 variableLengthVector.SetSize(2);
 variableLengthVector[0] = 1.1;
 variableLengthVector[1] = 2.2;

 image->SetPixel(pixelIndex, variableLengthVector);

 std::cout << "pixel (1,1) = " << pixelValue << std::endl;
 
 return EXIT_SUCCESS;

} </source>

CMakeLists.txt

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

project(VectorImage)

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

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

endif()

add_executable(VectorImage MACOSX_BUNDLE VectorImage.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(VectorImage ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(VectorImage ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build VectorImage

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

cd VectorImage/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:

./VectorImage

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.