[Insight-users] RGBImageType to FloatImageType wit CastImageFilter

[chasank]

Hi,

I'm reading a JPEG Image and trying to process a blur filter
(BinomialBlurImageFilter) on it. Because BinomialBlurImageFilter does not
accept RGBImageType, first I'm trying to convert the RGBImageType to
FloatImageType however I'm getting compiling errors; The sample code is
below; What conversion should I do for processing a RGB Image ?

typedef itk::Image< itk::RGBPixel <unsigned char>,  2 >  RGBImageType;
typedef itk::Image< float, 2 >                                      
FloatImageType;

        itk::VTKImageToImageFilter< RGBImageType >::Pointer converter =
                itk::VTKImageToImageFilter<RGBImageType> :: New();
        converter->SetInput(this->image);
        converter->Update();

        itk::CastImageFilter<RGBImageType, FloatImageType>::Pointer caster =
                itk::CastImageFilter<RGBImageType, FloatImageType>::New();
        caster->SetInput(converter->GetOutput());
        caster->Update();

        itk::BinomialBlurImageFilter< FloatImageType, FloatImageType >
::Pointer blurFilter =
                itk::BinomialBlurImageFilter < FloatImageType,
FloatImageType> ::New();
        blurFilter->SetInput( caster->GetOutput() );
        blurFilter->SetRepetitions(2);
        blurFilter->Update();

        itk::CastImageFilter<FloatImageType, RGBImageType>::Pointer caster2
=
                itk::CastImageFilter<FloatImageType, RGBImageType>::New();
        caster2->SetInput(blurFilter->GetOutput());
        caster2->Update();

/usr/local/include/ITK-4.3/itkConceptChecking.h: In member function 'void
itk::Concept::Convertible<T1, T2>::Constraints::constraints() [with T1 =
itk::RGBPixel<unsigned char>, T2 = float]':
/usr/local/include/ITK-4.3/itkConceptChecking.h:192:   instantiated from
'itk::Concept::Convertible<itk::RGBPixel&lt;unsigned char>, float>'
/usr/local/include/ITK-4.3/itkCastImageFilter.h:116:   instantiated from
'itk::CastImageFilter<itk::Image&lt;itk::RGBPixel&lt;unsigned char>, 2u>,
itk::Image<float, 2u> >'
../Program/program.cpp:67:   instantiated from here
/usr/local/include/ITK-4.3/itkConceptChecking.h:185: error: invalid
static_cast from type 'itk::RGBPixel<unsigned char>' to type 'float'
/usr/local/include/ITK-4.3/itkCastImageFilter.h: In member function 'TOutput
itk::Functor::Cast<TInput, TOutput>::operator()(const TInput&) const [with
TInput = itk::RGBPixel<unsigned char>, TOutput = float]':
/usr/local/include/ITK-4.3/itkUnaryFunctorImageFilter.hxx:175:  
instantiated from 'void itk::UnaryFunctorImageFilter<TInputImage,
TOutputImage, TFunction>::ThreadedGenerateData(const typename
TOutputImage::RegionType&, itk::ThreadIdType) [with TInputImage =
itk::Image<itk::RGBPixel&lt;unsigned char>, 2u>, TOutputImage =
itk::Image<float, 2u>, TFunction =
itk::Functor::Cast<itk::RGBPixel&lt;unsigned char>, float>]'
../Program/program.cpp:151:   instantiated from here
/usr/local/include/ITK-4.3/itkCastImageFilter.h:83: error: invalid
static_cast from type 'const itk::RGBPixel<unsigned char>' to type 'float'



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