[Insight-users] RecursiveSeparableImageFilter and ReconstructionImageFilter

[Gaëtan Lehmann]

Le 3 sept. 08 à 11:02, Tom Vercauteren a écrit :

> Hi Julien,
>
> As far as I understand it, RecursiveSeparableImageFilter should be
> recursive and separable meaning that (for a 2D image) the filter first
> requires entire lines and then requires entire columns. It can thus
> not easily benefit from streaming (even though it could be
> multithreaded).

And it is in ITK cvs :-)

---------------------
PatchSet 27831
Date: 2008/07/31 12:53:10
Author: glehmann
Branch: HEAD
Tag: (none)
Log:
ENH: Add thread support. The approach is very simple: the region is  
splitted
in several regions - one per thread - as usual in ITK, but with an  
additional
constrain to avoid splitting it on the dimension currently processed.

Members:
         Code/BasicFilters/itkRecursiveSeparableImageFilter.h:1.23->1.24
         Code/BasicFilters/itkRecursiveSeparableImageFilter.txx:1.40- 
 >1.41

---------------------
PatchSet 27832
Date: 2008/07/31 12:55:47
Author: glehmann
Branch: HEAD
Tag: (none)
Log:
ENH: Pass the requested number of threads to the (now threaded) internal
filters.

Members:
         Code/BasicFilters/itkSmoothingRecursiveGaussianImageFilter.h: 
1.13->1.14
         Code/BasicFilters/ 
itkSmoothingRecursiveGaussianImageFilter.txx:1.15->1.16

---------------------
PatchSet 27833
Date: 2008/07/31 13:01:00
Author: glehmann
Branch: HEAD
Tag: (none)
Log:
ENH: Multithread support. The filter is no built only with internal  
filters.
All of them are threaded.
ENH: Print Sigma value in PrintSelf() method.

Members:
         Code/BasicFilters/ 
itkGradientMagnitudeRecursiveGaussianImageFilter.h:1.16->1.17
         Code/BasicFilters/ 
itkGradientMagnitudeRecursiveGaussianImageFilter.txx:1.18->1.19




>
>
> If the filter needs to be run in one direction only, it should however
> be possible to do streaming with regions split in the other direction.
>
> Regards,
> Tom
>
> On Wed, Sep 3, 2008 at 10:45 AM, Gaëtan Lehmann
> <gaetan.lehmann at jouy.inra.fr> wrote:
>>
>> Le 3 sept. 08 à 09:43, Julien Michel a écrit :
>>
>>> Dear ITK users and developpers,
>>>
>>> The RecursiveSeparableImageFilter and the  
>>> ReconstructionImageFilter are
>>> requesting the largest possible region for their inputs.
>>>
>>> This implies that the whole RecursiveGaussian***Filter family can  
>>> not be
>>> streamed, as well as the ***ByReconstructionImageFilter family.
>>>
>>> Is there a way to make either of these filters streamable ? I had  
>>> a look
>>> at the code and it seems very optimized so I did not understand  
>>> everything,
>>> but yet I did not find evidences of streaming impossibility.
>>>
>>
>> Hi Julien,
>>
>> I can't say for the recursive gaussian filters, but the  
>> reconstruction
>> filters need to process the whole input to produce a valid result.
>> I'm afraid there is no way to stream this kind of filter and have  
>> it produce
>> the exact same result as the non streamed one.
>>
>> You may want to look at filters working on neighborhood instead of  
>> regions
>> (regions can cover most of the image) for this kind of feature.
>>
>> Regards,
>>
>> Gaëtan
>>
>> --
>> Gaëtan Lehmann
>> Biologie du Développement et de la Reproduction
>> INRA de Jouy-en-Josas (France)
>> tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
>> http://voxel.jouy.inra.fr  http://www.mandriva.org
>> http://www.itk.org  http://www.clavier-dvorak.org
>>
>>
>> _______________________________________________
>> Insight-users mailing list
>> Insight-users at itk.org
>> http://www.itk.org/mailman/listinfo/insight-users
>>
>>

-- 
Gaëtan Lehmann
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
http://voxel.jouy.inra.fr  http://www.mandriva.org
http://www.itk.org  http://www.clavier-dvorak.org

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