ITK/Examples/Developer/ImageFilterMultipleOutputs

#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
 
#include "ImageFilterMultipleOutputs.h"
 
int main(int, char*[])
{
  // Setup types
  typedef itk::Image<unsigned char, 2>   ImageType;
  typedef itk::ImageFilterMultipleOutputs<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("TestOutput1.jpg");
  writer->SetInput(filter->GetOutput1());
  writer->Update();
  }
 
  {
  typedef  itk::ImageFileWriter< ImageType  > WriterType;
  WriterType::Pointer writer = WriterType::New();
  writer->SetFileName("TestOutput2.jpg");
  writer->SetInput(filter->GetOutput2());
  writer->Update();
  }
 
  return EXIT_SUCCESS;
}

#ifndef __itkImageFilterMultipleOutputs_h
#define __itkImageFilterMultipleOutputs_h
 
#include "itkImageToImageFilter.h"
 
namespace itk
{
template< class TImage>
class ImageFilterMultipleOutputs : public ImageToImageFilter< TImage, TImage >
{
public:
  /** Standard class typedefs. */
  typedef ImageFilterMultipleOutputs             Self;
  typedef ImageToImageFilter< TImage, TImage > Superclass;
  typedef SmartPointer< Self >        Pointer;
 
  /** Method for creation through the object factory. */
  itkNewMacro(Self);
 
  /** Run-time type information (and related methods). */
  itkTypeMacro(ImageFilterMultipleOutputs, ImageToImageFilter);
 
  TImage* GetOutput1();
  TImage* GetOutput2();
 
protected:
  ImageFilterMultipleOutputs();
  ~ImageFilterMultipleOutputs(){}
 
  /** Does the real work. */
  virtual void GenerateData();
 
  /**  Create the Output */
  DataObject::Pointer MakeOutput(unsigned int idx);
 
private:
  ImageFilterMultipleOutputs(const Self &); //purposely not implemented
  void operator=(const Self &);  //purposely not implemented
 
};
} //namespace ITK
 
 
#ifndef ITK_MANUAL_INSTANTIATION
#include "ImageFilterMultipleOutputs.txx"
#endif
 
 
#endif // __itkImageFilterMultipleOutputs_h

#ifndef __itkImageFilterMultipleOutputs_txx
#define __itkImageFilterMultipleOutputs_txx
 
#include "ImageFilterMultipleOutputs.h"
 
#include "itkObjectFactory.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
 
namespace itk
{
 
template< class TImage>
ImageFilterMultipleOutputs<TImage>::ImageFilterMultipleOutputs()
{
  this->SetNumberOfRequiredOutputs(2);
  this->SetNumberOfRequiredInputs(0);
 
  this->SetNthOutput( 0, this->MakeOutput(0) );
  this->SetNthOutput( 1, this->MakeOutput(1) );
}
 
template< class TImage>
void ImageFilterMultipleOutputs<TImage>::GenerateData()
{
  typename TImage::IndexType start;
  start[0] = 0;
  start[1] = 0;
 
  typename TImage::SizeType size;
  size[0] = 20;
  size[1] = 20;
 
  typename TImage::RegionType region;
  region.SetSize(size);
  region.SetIndex(start);
 
  // Setup output 1
  typename TImage::Pointer output1 = this->GetOutput1();
  output1->SetRegions(region);
  output1->Allocate();  
 
  itk::ImageRegionIterator<TImage> outputIterator1(output1, output1->GetLargestPossibleRegion());
  outputIterator1.GoToBegin();
 
  while(!outputIterator1.IsAtEnd())
    {
    if(outputIterator1.GetIndex()[0] == outputIterator1.GetIndex()[1])
      {
      outputIterator1.Set(255);
      }
    else
      {
      outputIterator1.Set(0);
      }
 
    ++outputIterator1;
    }
 
  // Setup output 2
  typename TImage::Pointer output2 = this->GetOutput2();
  output2->SetRegions(region);
  output2->Allocate();
 
  itk::ImageRegionIterator<TImage> outputIterator2(output2, output2->GetLargestPossibleRegion());
  outputIterator2.GoToBegin();
 
  while(!outputIterator2.IsAtEnd())
    {
    if(outputIterator2.GetIndex()[0] > 10)
      {
      outputIterator2.Set(255);
      }
    else
      {
      outputIterator2.Set(0);
      }
 
    ++outputIterator2;
    }
 
}
 
template< class TImage>
DataObject::Pointer ImageFilterMultipleOutputs<TImage>::MakeOutput(unsigned int idx)
{
  DataObject::Pointer output;
 
  switch ( idx )
    {
    case 0:
      output = ( TImage::New() ).GetPointer();
      break;
    case 1:
      output = ( TImage::New() ).GetPointer();
      break;
    default:
      std::cerr << "No output " << idx << std::endl;
      output = NULL;
      break;
    }
  return output.GetPointer();
}
 
template< class TImage>
TImage* ImageFilterMultipleOutputs<TImage>::GetOutput1()
{
  return dynamic_cast< TImage * >(
           this->ProcessObject::GetOutput(0) );
}
 
template< class TImage>
TImage* ImageFilterMultipleOutputs<TImage>::GetOutput2()
{
  return dynamic_cast< TImage * >(
           this->ProcessObject::GetOutput(1) );
}
 
}// end namespace
 
 
#endif