[Insight-users] derivativeImageFilter

[john smith]

Hi to everyone,

I want to read an image and use a derivative image filter.I wrote the
following code, but when I get a failure because I thonk that the types of
reader,writer and derivative image filter do not match each other.Could
somebody help me?

Thanks in advance

================DerivativeImageFilter.cxx==========================
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkDerivativeImageFilter.h"



int main(int argc, char * argv[])
{
  // Verify command line arguments
  if( argc < 2 )
    {
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0] << " inputImageFile" << std::endl;
    return EXIT_FAILURE;
    }

  // Parse command line arguments
  std::string inputFilename = argv[1];

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

  typedef itk::ImageFileReader< UnsignedCharImageType >  readerType;
  typedef itk::ImageFileReader< UnsignedCharImageType >  writerType;

  typedef itk::DerivativeImageFilter<
          UnsignedCharImageType, FloatImageType >  filterType;

  // Create and setup a reader
  readerType::Pointer reader = readerType::New();
  reader->SetFileName( inputFilename.c_str() );

  // Create and setup a derivative filter
  filterType::Pointer derivativeFilter = filterType::New();
  derivativeFilter->SetInput( reader->GetOutput() );
  derivativeFilter->SetDirection(0); // "x" axis

   typedef  itk::ImageFileWriter< writerType  > WriterType;
  WriterType::Pointer writer = WriterType::New();
  writer->SetFileName("result.png");
  writer->SetInput(derivativeFilter->GetOutput());

      try
    {
    writer->Update();
    }
    catch( itk::ExceptionObject exp )
    {
    std::cerr << "Exception caught !" << std::endl;
    std::cerr << exp << std::endl;
    }

  return EXIT_SUCCESS;
}
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