ITK/Examples/SimpleOperations/RegionIntersection

This example demonstrates how to check if two regions of an image overlap/intersect.

RegionIntersection.cxx

<source lang="cpp">

1. include <itkImage.h>

int main(int, char*[]) {

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

 // Big region
 ImageType::RegionType bigRegion;

 ImageType::SizeType bigSize;
 bigSize[0] = 100;
 bigSize[1] = 100;

 ImageType::IndexType bigStart;
 bigStart[0] = 0;
 bigStart[1] = 0;
 
 bigRegion.SetSize(bigSize);
 bigRegion.SetIndex(bigStart);

 // Small inside region
 ImageType::RegionType smallInsideRegion;

 ImageType::SizeType smallInsideSize;
 smallInsideSize[0] = 10;
 smallInsideSize[1] = 10;

 ImageType::IndexType smallInsideStart;
 smallInsideStart[0] = 50;
 smallInsideStart[1] = 50;

 smallInsideRegion.SetSize(smallInsideSize);
 smallInsideRegion.SetIndex(smallInsideStart);

 std::cout << "Small inside region is " << bigRegion.IsInside(smallInsideRegion) << std::endl;
 
 // Small outside region
 ImageType::RegionType smallOutsideRegion;

 ImageType::SizeType smallOutsideSize;
 smallOutsideSize[0] = 10;
 smallOutsideSize[1] = 10;

 ImageType::IndexType smallOutsideStart;
 smallOutsideStart[0] = 110;
 smallOutsideStart[1] = 110;

 smallOutsideRegion.SetSize(smallOutsideSize);
 smallOutsideRegion.SetIndex(smallOutsideStart);

 std::cout << "Small outside region is " << bigRegion.IsInside(smallOutsideRegion) << std::endl;
 
 // Small overlap region
 ImageType::RegionType smallOverlapRegion;

 ImageType::SizeType smallOverlapSize;
 smallOverlapSize[0] = 10;
 smallOverlapSize[1] = 10;

 ImageType::IndexType smallOverlapStart;
 smallOverlapStart[0] = 97;
 smallOverlapStart[1] = 97;

 smallOverlapRegion.SetSize(smallOverlapSize);
 smallOverlapRegion.SetIndex(smallOverlapStart);

 std::cout << "Small overlap region is " << bigRegion.IsInside(smallOverlapRegion) << std::endl;
 
 return EXIT_SUCCESS;

}

</source>

CMakeLists.txt

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

project(RegionIntersection)

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

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

endif()

add_executable(RegionIntersection MACOSX_BUNDLE RegionIntersection.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(RegionIntersection ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(RegionIntersection ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build RegionIntersection

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

cd RegionIntersection/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:

./RegionIntersection

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.