ITK/Examples/WishList/ImageProcessing/EdgePotentialImageFilter

Runs, but output seems to sharp - I would have expected a much fuzzier boundary around the rectangle.

EdgePotentialImageFilter.cxx

<source lang="cpp">

1. include "itkCovariantVector.h"
2. include "itkEdgePotentialImageFilter.h"
3. include "itkGradientImageFilter.h"
4. include "itkImage.h"
5. include "itkImageFileWriter.h"
6. include "itkRescaleIntensityImageFilter.h"

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

static void CreateImage(UnsignedCharImageType::Pointer image);

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

 // Setup types
 typedef itk::Image< float,  2 >   FloatImageType;
 typedef itk::Image< itk::CovariantVector<float, 2>, 2 >   VectorImageType;

 UnsignedCharImageType::Pointer image = UnsignedCharImageType::New();
 CreateImage(image);
 
 // Create and setup a gradient filter
 typedef itk::GradientImageFilter<
     UnsignedCharImageType, float>  GradientFilterType;
 GradientFilterType::Pointer gradientFilter = GradientFilterType::New();
 gradientFilter->SetInput(image);
 gradientFilter->Update();

 // Create and setup an edge potential filter
 typedef itk::EdgePotentialImageFilter<
     VectorImageType, FloatImageType>  EdgePotentialImageFilterType;
 EdgePotentialImageFilterType::Pointer edgePotentialImageFilter = EdgePotentialImageFilterType::New();
 edgePotentialImageFilter->SetInput( gradientFilter->GetOutput() );
 edgePotentialImageFilter->Update();

 // Scale so we can write to a PNG
 typedef itk::RescaleIntensityImageFilter< FloatImageType, UnsignedCharImageType > RescaleFilterType;
 RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
 rescaleFilter->SetInput(edgePotentialImageFilter->GetOutput());
 rescaleFilter->SetOutputMinimum(0);
 rescaleFilter->SetOutputMaximum(255);
 rescaleFilter->Update();

 typedef itk::ImageFileWriter<UnsignedCharImageType> FileWriterType;
 FileWriterType::Pointer writer = FileWriterType::New();
 writer->SetFileName("output.png");
 writer->SetInput(rescaleFilter->GetOutput());
 writer->Update();
 
 return EXIT_SUCCESS;

}

void CreateImage(UnsignedCharImageType::Pointer image) {

 // Create a black image with 2 white regions
 
 UnsignedCharImageType::IndexType start;
 start.Fill(0);

 UnsignedCharImageType::SizeType size;
 size.Fill(200);

 UnsignedCharImageType::RegionType region(start,size);
 image->SetRegions(region);
 image->Allocate();
 image->FillBuffer(0);
 
 // Make a square
 for(unsigned int r = 20; r < 80; r++)
   {
   for(unsigned int c = 30; c < 100; c++)
     {
     UnsignedCharImageType::IndexType pixelIndex;
     pixelIndex[0] = r;
     pixelIndex[1] = c;

     image->SetPixel(pixelIndex, 255);

     }
   }

}

</source>

CMakeLists.txt

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

project(EdgePotentialImageFilter)

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

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

endif()

add_executable(EdgePotentialImageFilter MACOSX_BUNDLE EdgePotentialImageFilter.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(EdgePotentialImageFilter ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(EdgePotentialImageFilter ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build EdgePotentialImageFilter

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

cd EdgePotentialImageFilter/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:

./EdgePotentialImageFilter

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.