ITK/Examples/Developer/ImageFilterMultipleOutputsDifferentType

ImageFilterMultipleOutputsDifferentTypeExample.cxx

<source lang="cpp">

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

1. include "ImageFilterMultipleOutputsDifferentType.h"

int main(int, char*[]) {

 // Setup types
 typedef itk::Image<unsigned char, 2>   InputImageType;
 typedef itk::Image<float, 2>   OutputImageType1;
 typedef itk::Image<int, 2>   OutputImageType2;
 typedef itk::ImageFilterMultipleOutputsDifferentType<InputImageType, OutputImageType1, OutputImageType2>  FilterType;

 // Create and the filter
 FilterType::Pointer filter = FilterType::New();
 filter->Update();

 {
 typedef  itk::ImageFileWriter< OutputImageType1  > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("TestOutput1.jpg");
 writer->SetInput(filter->GetOutput1());
 writer->Update();
 }
 
 {
 typedef  itk::ImageFileWriter< OutputImageType2  > WriterType;
 WriterType::Pointer writer = WriterType::New();
 writer->SetFileName("TestOutput2.jpg");
 writer->SetInput(filter->GetOutput2());
 writer->Update();
 }
 
 return EXIT_SUCCESS;

}

</source>

ImageFilterMultipleOutputsDifferentType.h

<source lang="cpp">

1. ifndef __itkImageFilterMultipleOutputsDifferentType_h
2. define __itkImageFilterMultipleOutputsDifferentType_h

1. include "itkImageToImageFilter.h"

namespace itk { template< typename TInputImage, typename TOutputImage1, typename TOutputImage2> class ImageFilterMultipleOutputsDifferentType : public ImageToImageFilter< TInputImage, TOutputImage1 > // This doesn't actually matter, as we will be overriding the output image type in MakeOutput() { public:

 /** Standard class typedefs. */
 typedef ImageFilterMultipleOutputsDifferentType             Self;
 typedef ImageToImageFilter< TInputImage, TOutputImage1 > Superclass;
 typedef SmartPointer< Self >        Pointer;

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

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

 TOutputImage1* GetOutput1();
 TOutputImage2* GetOutput2();
 

protected:

 ImageFilterMultipleOutputsDifferentType();
 ~ImageFilterMultipleOutputsDifferentType(){}

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

 /**  Create the Output */
 DataObject::Pointer MakeOutput(unsigned int idx);

private:

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

}; } //namespace ITK

1. ifndef ITK_MANUAL_INSTANTIATION
2. include "ImageFilterMultipleOutputsDifferentType.hxx"
3. endif

1. endif // __itkImageFilterMultipleOutputsDifferentType_h

</source>

ImageFilterMultipleOutputsDifferentType.hxx

<source lang="cpp">

1. ifndef __itkImageFilterMultipleOutputsDifferentType_txx
2. define __itkImageFilterMultipleOutputsDifferentType_txx

1. include "ImageFilterMultipleOutputsDifferentType.h"

1. include "itkObjectFactory.h"
2. include "itkImageRegionIterator.h"
3. include "itkImageRegionConstIterator.h"

namespace itk {

template< typename TInputImage, typename TOutputImage1, typename TOutputImage2> ImageFilterMultipleOutputsDifferentType<TInputImage, TOutputImage1, TOutputImage2>::ImageFilterMultipleOutputsDifferentType() {

 this->SetNumberOfRequiredOutputs(2);
 this->SetNumberOfRequiredInputs(0);

 this->SetNthOutput( 0, this->MakeOutput(0) );
 this->SetNthOutput( 1, this->MakeOutput(1) );

}

template< typename TInputImage, typename TOutputImage1, typename TOutputImage2> void ImageFilterMultipleOutputsDifferentType<TInputImage, TOutputImage1, TOutputImage2>::GenerateData() {

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

 itk::Size<2> size;
 size.Fill(20);

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

 // Setup output 1
 typename TOutputImage1::Pointer output1 = this->GetOutput1();
 output1->SetRegions(region);
 output1->Allocate();
 
 // Setup output 2
 typename TOutputImage2::Pointer output2 = this->GetOutput2();
 output2->SetRegions(region);
 output2->Allocate();

}

template< typename TInputImage, typename TOutputImage1, typename TOutputImage2> DataObject::Pointer ImageFilterMultipleOutputsDifferentType<TInputImage, TOutputImage1, TOutputImage2>::MakeOutput(unsigned int idx) {

 DataObject::Pointer output;

 switch ( idx )
   {
   case 0:
     output = ( TOutputImage1::New() ).GetPointer();
     break;
   case 1:
     output = ( TOutputImage2::New() ).GetPointer();
     break;
   default:
     std::cerr << "No output " << idx << std::endl;
     output = NULL;
     break;
   }
 return output.GetPointer();

}

template< typename TInputImage, typename TOutputImage1, typename TOutputImage2> TOutputImage1* ImageFilterMultipleOutputsDifferentType<TInputImage, TOutputImage1, TOutputImage2>::GetOutput1() {

 return dynamic_cast< TOutputImage1 * >(this->ProcessObject::GetOutput(0) );

}

template< typename TInputImage, typename TOutputImage1, typename TOutputImage2> TOutputImage2* ImageFilterMultipleOutputsDifferentType<TInputImage, TOutputImage1, TOutputImage2>::GetOutput2() {

 return dynamic_cast< TOutputImage2 * >(this->ProcessObject::GetOutput(1) );

}

}// end namespace

1. endif

</source>

CMakeLists.txt

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

project(ImageFilterMultipleOutputsDifferentTypeExample)

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

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

endif()

add_executable(ImageFilterMultipleOutputsDifferentTypeExample MACOSX_BUNDLE ImageFilterMultipleOutputsDifferentTypeExample.cxx)

if( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(ImageFilterMultipleOutputsDifferentTypeExample ITKReview ${ITK_LIBRARIES})

else( "${ITK_VERSION_MAJOR}" LESS 4 )

 target_link_libraries(ImageFilterMultipleOutputsDifferentTypeExample ${ITK_LIBRARIES})

endif( "${ITK_VERSION_MAJOR}" LESS 4 )

</syntaxhighlight>

Download and Build ImageFilterMultipleOutputsDifferentTypeExample

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

cd ImageFilterMultipleOutputsDifferentTypeExample/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:

./ImageFilterMultipleOutputsDifferentTypeExample

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.