ITK/Examples/Math/Trig/Atan2ImageFilter

Atan2ImageFilter.cxx

<source lang="cpp">

1. include "itkAtan2ImageFilter.h"
2. include "itkImage.h"

typedef itk::Image<float, 2> FloatImageType;

static void CreateImage1(FloatImageType::Pointer image); static void CreateImage2(FloatImageType::Pointer image);

int main(int, char *[]) {

 FloatImageType::Pointer image1 = FloatImageType::New();
 CreateImage1(image1);

 FloatImageType::Pointer image2 = FloatImageType::New();
 CreateImage2(image2);

 // Compute the atan of each pixel
 typedef itk::Atan2ImageFilter <FloatImageType, FloatImageType, FloatImageType>
         Atan2ImageFilterType;

 Atan2ImageFilterType::Pointer atan2ImageFilter
         = Atan2ImageFilterType::New ();
 atan2ImageFilter->SetInput1(image1);
 atan2ImageFilter->SetInput2(image2);
 atan2ImageFilter->Update();

 return EXIT_SUCCESS;

}

void CreateImage1(FloatImageType::Pointer image) {

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

 FloatImageType::SizeType size;
 size.Fill(10);

 FloatImageType::RegionType region(start,size);

 image->SetRegions(region);
 image->Allocate();

 itk::ImageRegionIterator<FloatImageType> imageIterator(image,region);

 while(!imageIterator.IsAtEnd())
   {
   imageIterator.Set(imageIterator.GetIndex()[0] - imageIterator.GetIndex()[1]);
   ++imageIterator;
   }

}

void CreateImage2(FloatImageType::Pointer image) {

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

 FloatImageType::SizeType size;
 size.Fill(10);

 FloatImageType::RegionType region(start,size);

 image->SetRegions(region);
 image->Allocate();

 itk::ImageRegionIterator<FloatImageType> imageIterator(image,region);

 while(!imageIterator.IsAtEnd())
   {
   imageIterator.Set(imageIterator.GetIndex()[0] - imageIterator.GetIndex()[1]);
   ++imageIterator;
   }

}

</source>

CMakeLists.txt

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

project(Atan2ImageFilter)

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

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

endif()

add_executable(Atan2ImageFilter MACOSX_BUNDLE Atan2ImageFilter.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(Atan2ImageFilter ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(Atan2ImageFilter ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build Atan2ImageFilter

Click here to download Atan2ImageFilter and its CMakeLists.txt file. Once the tarball Atan2ImageFilter.tar has been downloaded and extracted,

cd Atan2ImageFilter/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:

./Atan2ImageFilter

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.