ITK/Examples/Cxx/Developer/ImageSource

Description

This example demonstrates how to make a filter which produces an image.

ImageSource.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileWriter.h"

1. include "ImageFilter.h"

int main(int, char*[]) {

 // Setup types
 typedef itk::Image<unsigned char, 2>   ImageType;
 typedef itk::ImageFilter<ImageType>  FilterType;

 // Create and the filter
 FilterType::Pointer filter = FilterType::New();
 filter->Update();
 
 typedef  itk::ImageFileWriter< ImageType  > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("Test.jpg");
 writer->SetInput(filter->GetOutput());
 writer->Update();
 
 return EXIT_SUCCESS;

} </source>

ImageSource.h

<source lang="cpp">

1. ifndef __itkImageFilter_h
2. define __itkImageFilter_h

1. include "itkImageSource.h"

namespace itk { template< class TOutputImage> class ImageFilter:public ImageSource< TOutputImage > { public:

 /** Standard class typedefs. */
 typedef ImageFilter             Self;
 typedef ImageSource< TOutputImage > Superclass;
 typedef SmartPointer< Self >        Pointer;

 /** Method for creation through the object factory. */
 itkNewMacro(Self);

 /** Run-time type information (and related methods). */
 itkTypeMacro(ImageFilter, ImageSource);

protected:

 ImageFilter(){}
 ~ImageFilter(){}

 /** Does the real work. */
 virtual void GenerateData();

private:

 ImageFilter(const Self &); //purposely not implemented
 void operator=(const Self &);  //purposely not implemented

}; } //namespace ITK

1. ifndef ITK_MANUAL_INSTANTIATION
2. include "ImageFilter.txx"
3. endif

1. endif // __itkImageFilter_h

</source>

ImageSource.txx

<source lang="cpp">

1. ifndef __itkImageFilter_txx
2. define __itkImageFilter_txx

1. include "ImageFilter.h"

1. include "itkObjectFactory.h"

namespace itk {

template< class TOutputImage> void ImageFilter< TOutputImage>

GenerateData()

{

 typename TOutputImage::Pointer output = this->GetOutput();
 typename TOutputImage::RegionType region;
 typename TOutputImage::IndexType start;
 start[0] = 0;
 start[1] = 0;

 typename TOutputImage::SizeType size;
 size[0] = 200;
 size[1] = 300;

 region.SetSize(size);
 region.SetIndex(start);

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

 itk::ImageRegionIterator<TOutputImage> imageIterator(output,output->GetLargestPossibleRegion());

 while(!imageIterator.IsAtEnd())
   {
   if(imageIterator.GetIndex()[0] == imageIterator.GetIndex()[1])
     {
     imageIterator.Set(255);
     }
   else
     {
     imageIterator.Set(0);
     }

   ++imageIterator;
   }

}

}// end namespace

1. endif

</source>

CMakeLists.txt

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

project(ImageSource)

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

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

endif()

add_executable(ImageSource MACOSX_BUNDLE ImageSource.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(ImageSource ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(ImageSource ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build ImageSource

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

cd ImageSource/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:

./ImageSource

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.