[Insight-users] itk::MinimumMaximumImageCalculator with VectorImage

[Luis Ibanez]

Hi Markus,


                        This is not a bug.


It seems that you are misusing the MinimumMaximumImageCalculator class.

In order to find the minimum of a set of pixels, the pixel type must
support the concept of comparison "<", "min" and "max".

Such operations are not defined for a mathematical Vector.

In other words,...

            When is vector A < vector B ??

probably the only reasonable definition is to say:

           when Magnitude of A < Magnitude of B


in which case, what you should feed into the MinimumMaximumImage
Calculator class is the image Magnitude of the vector image,
instead of the vector image itself.


Please let us know if you still find any problems using this class.



   Thanks


      Luis



===================
Markus Weigert wrote:
> Hi insight users,
> 
> I'm receiving compiler errors when I try to use
> itk::MinimumMaximumImageCalculator with an image of
> float,3 vectors (result of a registration).
> It seems, that the < operator is not defined for this pixeltype.
> Is this intended or is it more a bug?
> I'm using itk 2.4.0.
> 
> Regards,
> Markus
> 
> <
> C:\Libraries\InsightToolkit-2.4.0\Code\BasicFilters\itkMinimumMaximumImageCalculator.txx(92) 
> : error C2039: 'max' : Ist kein Element von 'NumericTraits<class 
> itk::Vector<float,3> >'
>       
> C:\Libraries\InsightToolkit-2.4.0\Code\Common\itkNumericTraitsVectorPixel.h(284) 
> : Siehe Deklaration von 'NumericTraits<class itk::Vector<float,3> >'
>       C:\Programme\Microsoft Visual Studio\VC98\INCLUDE\xstring(583) : 
> Bei der Kompilierung der Member-Funktion 'void __thiscall 
> itk::MinimumMaximumImageCalculator<class itk::Image<class 
> itk::Vector<float,3>,3> >::ComputeMinimum(void)' der Klassen
> vorlage
>  >
> 
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