[Insight-users] RGBImageType to FloatImageType wit CastImageFilter

[Bill Lorensen]

Try RGBToLuminanceImageFilter

http://itk.org/Wiki/ITK/Examples/ImageProcessing/RGBToLuminanceImageFilter

Bill



On Fri, May 24, 2013 at 5:02 AM, chasank <chasank at gmail.com> wrote:

> 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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-- 
Unpaid intern in BillsBasement at noware dot com
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