[Insight-users] derivativeImageFilter

[robert tamburo]

Take a look at your writerType typedef.


On Tue, Mar 15, 2011 at 9:49 AM, john smith <mkitkinsightuser at gmail.com>wrote:

> 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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