[Insight-users] Read Image - extract region - use median filter - write image

[john smith]

Hello,

I use visualstudio2010 and I am trying to read an image, then extract a
region from the image and finally apply a median filter on the image's
extracted area, getting the final image using a writer object. I created the
four needed objects (reader, region, median filter, writer) as it is shown
in the code bellow. But when I built my project, I get the following
failure:(* 'FilterType' : redefinition; different basic types*). I can
understand that my wrong was that I used the same FilterType for both  *
itk::RegionOfInterestImageFilter* and * itk::MedianImageFilter*, but I don't
know how to solve it. Any ideas?

Thanks in advance.



--------------------------code----------------------------
----------------------------------------------------

#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"

#include "itkRegionOfInterestImageFilter.h"
#include "itkMedianImageFilter.h"


#include "itkImage.h"


int main( int argc, char ** argv )
{
  // Verify the number of parameters in the command line
  if( argc < 7 )
    {
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0] << " inputImageFile  outputImageFile " <<
std::endl;
    std::cerr << " startX startY sizeX sizeY" << std::endl;
    return EXIT_FAILURE;
    }


  // set  pixel and image type
  typedef unsigned short        InputPixelType;
  typedef unsigned short        OutputPixelType;
  const   unsigned int        Dimension = 2;

  typedef itk::Image< InputPixelType,  Dimension >    InputImageType;
  typedef itk::Image< OutputPixelType, Dimension >    OutputImageType;



  // set reader and writer object
  typedef itk::ImageFileReader< InputImageType  >  ReaderType;
  typedef itk::ImageFileWriter< OutputImageType >  WriterType;


  typedef itk::RegionOfInterestImageFilter< InputImageType,
                                            OutputImageType > FilterType;

  FilterType::Pointer region = FilterType::New();

  // Software Guide : BeginCodeSnippet
  OutputImageType::IndexType start;
  start[0] = atoi( argv[3] );
  start[1] = atoi( argv[4] );
  // Software Guide : EndCodeSnippet


  //  start of  region
  OutputImageType::SizeType size;
  size[0] = atoi( argv[5] );
  size[1] = atoi( argv[6] );


  // size of region
  OutputImageType::RegionType desiredRegion;
  desiredRegion.SetSize(  size  );
  desiredRegion.SetIndex( start );

  // Set region of interest
  region->SetRegionOfInterest( desiredRegion );

  // Create reader and writer object
  ReaderType::Pointer reader = ReaderType::New();
  WriterType::Pointer writer = WriterType::New();

  // Set the input and output filename on the reader and writer respectively
  const char * inputFilename  = argv[1];
  const char * outputFilename = argv[2];


  reader->SetFileName( inputFilename  );
  writer->SetFileName( outputFilename );

  //////////////////////////////////////////////
  //////////////////////////////////////////////
   // Set and create median filter


  typedef itk::MedianImageFilter<
               InputImageType, OutputImageType >  FilterType;

  FilterType::Pointer filter = FilterType::New();


  // set the neighborhood of median filter. Here 3x3.
  InputImageType::SizeType indexRadius;

  indexRadius[0] = 1; // radius along x
  indexRadius[1] = 1; // radius along y

  filter->SetRadius( indexRadius );

  /////////////////////////////////////////////////
  ///////////////////////////////////////

  // pipeline
  region->SetInput( reader->GetOutput() );
  filter->SetInput( region->GetOutput() );
  writer->SetInput( filter->GetOutput() );



  // try-catch update of the filters
  try
    {
    writer->Update();
    }
  catch( itk::ExceptionObject & err )
    {
    std::cerr << "ExceptionObject caught !" << std::endl;
    std::cerr << err << std::endl;
    return EXIT_FAILURE;
    }



  return EXIT_SUCCESS;
}
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