[Insight-users] UnaryFunctorImageFilter and MetaDataDictionnary

[Julien Michel]

Julien Michel a écrit :
> Dear ITK developpers,
> 
> Lately I bumped again into a bug which I first reported in 2007 on ITK 
> users list :
> http://www.cmake.org/pipermail/insight-users/2007-March/021468.html
> 
> I found back the issue I reported in Mantis 
> (http://public.kitware.com/Bug/view.php?id=4625)
> and it seems it was not fixed because one can not be sure that the 
> MetaDataDictionary still makes sense after some filter (which is a good 
> point).
> 
> I think we still need to copy the Dictionnary in most of the cases. 
> Maybe we could add a CopyMetaDataDictionnary flag in the base class set 
> to true by default and which could be used to deactivate the copy of the 
> dictionnary when it does not make sense.
> 
> Does it sounds like an acceptable solution to you ?
> 
> Many thanks,

I am really sorry to insist but this is a major issue for us. We are 
using the metadata dictionnary to store valuable information for 
downstream filters, and if there is one single UnaryFunctorImageFilter 
(which is common) in this pipeline, these filters will not work.

Besides, this is not really a MetaDataDictionnary issue, it is more the 
lack of call to the CopyData() method in the 
GenerateOutputInformation(). We could store these information elsewhere 
and still fail to got them propagated through the pipeline.

I can provide a patch, and will be glad to discuss this issue with ITK 
developpers.

Many thanks,

Julien
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Julien MICHEL - Ingénieur d'études - Traitement d'images
CS Systèmes d'Information - Division ESPACE
Département Information Géographique & Image
Téléphone : +33 561 17 64 27
Email : julien.michel at c-s.fr

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