[ITK-users] itkMeanImageFilter on RGB (how to adjust example MedianFilteringOfAnRGBImage?)

[Bill Lorensen]

You need to define a cast operator. SOmething like:
  operator TComponent()
  {
    return this->GetLuminance();
  }

But I don't think you will get the result you want.

Bill

On Fri, Jul 11, 2014 at 7:53 AM, Dr. Roman Grothausmann
<grothausmann.roman at mh-hannover.de> wrote:
> Dear mailing list members,
>
>
> How would I need to extend/modify the example for
> MedianFilteringOfAnRGBImage
>
> http://itk.org/ITKExamples/src/Filtering/Smoothing/MedianFilteringOfAnRGBImage/Documentation.html
>
> to work with itkMeanImageFilter?
>
> I modified myRGBPixel like this:
>
> namespace itk{
>   template<typename TComponent>
>   class myRGBPixel : public RGBPixel<TComponent>{
>   public:
>     typedef myRGBPixel     Self;
>     typedef RGBPixel<TComponent> Superclass;
>
>     myRGBPixel():Superclass() {} //avoid candidate expects 1 argument, 0
> provided
>     myRGBPixel(int i):Superclass(i) {} //avoid candidate expects 0
> arguments, 1 provided
>
>     using RGBPixel<TComponent>::operator=;
>
>     bool operator<=(const Self & r) const{
>       return (this->GetLuminance() <= r.GetLuminance());
>     }
>     bool operator>=(const Self & r) const{
>       return (this->GetLuminance() >= r.GetLuminance());
>     }
>     bool operator<(const Self & r) const{
>       return (this->GetLuminance() < r.GetLuminance());
>     }
>     bool operator>(const Self & r) const{
>       return (this->GetLuminance() > r.GetLuminance());
>     }
>   };
> }
>
>
> However gcc still yields this error:
>
>
> In file included from
> /opt/itk-4.5.1/include/ITK-4.5/itkMeanImageFilter.h:115:0,
>                  from /net/home/ghky/itk/simple/mean-CPU_02.cxx:8:
> /opt/itk-4.5.1/include/ITK-4.5/itkMeanImageFilter.hxx: In instantiation of
> ?void itk::MeanImageFilter<TInputImage,
> TOutputImage>::ThreadedGenerateData(const OutputImageRegionType&,
> itk::ThreadIdType) [with TInputImage = itk::Image<itk::myRGBPixel<unsigned
> char>, 3u>; TOutputImage = itk::Image<itk::myRGBPixel<unsigned char>, 3u>;
> itk::MeanImageFilter<TInputImage, TOutputImage>::OutputImageRegionType =
> itk::ImageRegion<3u>; itk::ThreadIdType = unsigned int]?:
> /net/home/ghky/itk/simple/mean-CPU_02.cxx:335:5:   required from here
> /opt/itk-4.5.1/include/ITK-4.5/itkMeanImageFilter.hxx:81:9: error: invalid
> static_cast from type
> ?itk::ConstNeighborhoodIterator<itk::Image<itk::myRGBPixel<unsigned char>,
> 3u>,
> itk::ZeroFluxNeumannBoundaryCondition<itk::Image<itk::myRGBPixel<unsigned
> char>, 3u>, itk::Image<itk::myRGBPixel<unsigned char>, 3u> > >::PixelType
> {aka itk::myRGBPixel<unsigned char>}? to type
> ?itk::MeanImageFilter<itk::Image<itk::myRGBPixel<unsigned char>, 3u>,
> itk::Image<itk::myRGBPixel<unsigned char>, 3u> >::InputRealType {aka
> double}?
> make[3]: *** [CMakeFiles/mean-CPU_02.dir/mean-CPU_02.cxx.o] Error 1
> make[2]: *** [CMakeFiles/mean-CPU_02.dir/all] Error 2
> make[1]: *** [CMakeFiles/mean-CPU_02.dir/rule] Error 2
> make: *** [mean-CPU_02] Error 2
>
>
> What am I missing in myRGBPixel?
>
> Any help or hints are very much appreciated
> Roman
>
> --
> Dr. Roman Grothausmann
>
> Tomographie und Digitale Bildverarbeitung
> Tomography and Digital Image Analysis
>
> Institut für Funktionelle und Angewandte Anatomie, OE 4120
> Medizinische Hochschule Hannover
> Carl-Neuberg-Str. 1
> D-30625 Hannover
>
> Tel. +49 511 532-9574
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