ITK/Examples/WishList/SpatialObjects/ContourSpatialObject

Output image is empty?

ContourSpatialObject.cxx

<source lang="cpp">

1. include "itkSpatialObjectToImageFilter.h"
2. include "itkContourSpatialObject.h"
3. include "itkContourSpatialObjectPoint.h"
4. include "itkImageFileWriter.h"

1. include "QuickView.h"

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

 typedef unsigned char PixelType;
 const unsigned int Dimension = 2;

 typedef itk::Image< PixelType, Dimension >    ImageType;

 typedef itk::ContourSpatialObject< Dimension >   ContourType;

 typedef itk::SpatialObjectToImageFilter<
   ContourType, ImageType >   SpatialObjectToImageFilterType;

 // Create a list of points
 ContourType::ControlPointListType points;

 // Add some points
 ContourType::ControlPointType point;
 point.SetPosition(0,0);
 points.push_back(point);
 point.SetPosition(0,30);
 points.push_back(point);
 point.SetPosition(30,30);
 points.push_back(point);
 point.SetPosition(0,0);
 points.push_back(point);
 
 // Create a contour from the list of points
 ContourType::Pointer contour = ContourType::New();
 contour->SetControlPoints(points);

 SpatialObjectToImageFilterType::Pointer imageFilter =
   SpatialObjectToImageFilterType::New();
 itk::Size<2> size;
 size.Fill(50);
 imageFilter->SetInsideValue(255); // white
 imageFilter->SetSize(size);
 imageFilter->SetInput(contour);
 imageFilter->Update();

 QuickView viewer;
 viewer.AddImage(imageFilter->GetOutput());
 viewer.Visualize();
 /*
 typedef itk::ImageFileWriter< ImageType >     WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("contour.png");
 writer->SetInput( imageFilter->GetOutput() );
 writer->Update();
 */
 return EXIT_SUCCESS;

}

</source>

CMakeLists.txt

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

project(ContourSpatialObject)

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

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

else()

 find_package(ItkVtkGlue REQUIRED)
 include(${ItkVtkGlue_USE_FILE})
 set(Glue ItkVtkGlue)

endif()

add_executable(ContourSpatialObject MACOSX_BUNDLE ContourSpatialObject.cxx) target_link_libraries(ContourSpatialObject

 ${Glue}  ${VTK_LIBRARIES} ${ITK_LIBRARIES})

</syntaxhighlight>

Download and Build ContourSpatialObject

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

cd ContourSpatialObject/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:

./ContourSpatialObject

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