ITK/Examples/Images/MaskNeighborhoodOperatorImageFilter

MaskNeighborhoodOperatorImageFilter.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileWriter.h"
3. include "itkMaskImageFilter.h"
4. include "itkRescaleIntensityImageFilter.h"
5. include "itkMaskNeighborhoodOperatorImageFilter.h"
6. include "itkSobelOperator.h"

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

static void CreateImage(UnsignedCharImageType::Pointer image); static void CreateHalfMask(UnsignedCharImageType::Pointer image, UnsignedCharImageType::Pointer mask);

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

 UnsignedCharImageType::Pointer image = UnsignedCharImageType::New();
 CreateImage(image);

 UnsignedCharImageType::Pointer mask = UnsignedCharImageType::New();
 CreateHalfMask(image, mask);

 typedef itk::SobelOperator<float, 2> SobelOperatorType;
 SobelOperatorType sobelOperator;
 itk::Size<2> radius;
 radius.Fill(1); // a radius of 1x1 creates a 3x3 operator
 sobelOperator.SetDirection(0); // Create the operator for the X axis derivative
 sobelOperator.CreateToRadius(radius);

 // Visualize mask image
 typedef itk::MaskNeighborhoodOperatorImageFilter< UnsignedCharImageType, UnsignedCharImageType, FloatImageType, float> MaskNeighborhoodOperatorImageFilterType;
 MaskNeighborhoodOperatorImageFilterType::Pointer maskNeighborhoodOperatorImageFilter = 
   MaskNeighborhoodOperatorImageFilterType::New();
 maskNeighborhoodOperatorImageFilter->SetInput(image);
 maskNeighborhoodOperatorImageFilter->SetMaskImage(mask);
 maskNeighborhoodOperatorImageFilter->SetOperator(sobelOperator);
 maskNeighborhoodOperatorImageFilter->Update();
 
 typedef itk::RescaleIntensityImageFilter< FloatImageType, UnsignedCharImageType > RescaleFilterType;
 RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
 rescaleFilter->SetInput(maskNeighborhoodOperatorImageFilter->GetOutput());
 rescaleFilter->Update();

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

 return EXIT_SUCCESS;

}

void CreateHalfMask(UnsignedCharImageType::Pointer image, UnsignedCharImageType::Pointer mask) {

 itk::ImageRegion<2> region = image->GetLargestPossibleRegion();

 mask->SetRegions(region);
 mask->Allocate();
 mask->FillBuffer(0);

 itk::Size<2> regionSize = region.GetSize();

 itk::ImageRegionIterator<UnsignedCharImageType> imageIterator(mask,region);

 // Make the left half of the mask white and the right half black
 while(!imageIterator.IsAtEnd())
 {
   if(static_cast<unsigned int>(imageIterator.GetIndex()[0]) > regionSize[0] / 2)
       {
       imageIterator.Set(0);
       }
     else
       {
       imageIterator.Set(1);
       }

   ++imageIterator;
 }

 typedef itk::RescaleIntensityImageFilter< UnsignedCharImageType, UnsignedCharImageType > RescaleFilterType;
 RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
 rescaleFilter->SetInput(mask);
 rescaleFilter->Update();
 
 typedef  itk::ImageFileWriter< UnsignedCharImageType  > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("mask.png");
 writer->SetInput(rescaleFilter->GetOutput());
 writer->Update();

}

void CreateImage(UnsignedCharImageType::Pointer image) {

 itk::Index<2> start;
 start.Fill(0);

 itk::Size<2> size;
 size.Fill(100);

 itk::ImageRegion<2> region(start,size);

 image->SetRegions(region);
 image->Allocate();
 image->FillBuffer(0);

 // Make a square
 for(unsigned int r = 30; r < 70; r++)
   {
   for(unsigned int c = 30; c < 70; c++)
     {
     FloatImageType::IndexType pixelIndex;
     pixelIndex[0] = r;
     pixelIndex[1] = c;

     image->SetPixel(pixelIndex, 255);
     }
   }
   
 typedef  itk::ImageFileWriter< UnsignedCharImageType  > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("input.png");
 writer->SetInput(image);
 writer->Update();

}

</source>

CMakeLists.txt

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

project(MaskNeighborhoodOperatorImageFilter)

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

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

endif()

add_executable(MaskNeighborhoodOperatorImageFilter MACOSX_BUNDLE MaskNeighborhoodOperatorImageFilter.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(MaskNeighborhoodOperatorImageFilter ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(MaskNeighborhoodOperatorImageFilter ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build MaskNeighborhoodOperatorImageFilter

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

cd MaskNeighborhoodOperatorImageFilter/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:

./MaskNeighborhoodOperatorImageFilter

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.