[Insight-users] How to compute the local maximas in an image

[Gaëtan Lehmann]

Le 19 déc. 08 à 19:43, Oliver Trebbe a écrit :

> Oliver Trebbe schrieb:
>> Gaëtan Lehmann schrieb:
>>>
>>> Le 19 déc. 08 à 15:29, Oliver Trebbe a écrit :
>>>
>>>> Hello again Guys :)
>>>>
>>>> i just need the number of the maximas, where they are can also be  
>>>> important but not necessary...
>>>
>>>
>>> Hi,
>>>
>>> You may want to try an itk::RegionalMaximaImageFilter followed by  
>>> an itk::ConnectedComponentImageFilter. Once the filters updated,  
>>> you can get the number of regional maxima with the method  
>>> itk::ConnectedComponentImageFilter::GetObjectCount().
>>>
>>> Maybe regional extrema is not exactly what you want though.
>>>
>>> Regards,
>>>
>>> Gaëtan
>>>
>> Hi,
>>
>> dont know where´s my failure, but it says there is no  
>> itkRegionalMaximaImageFile header...
>> so i used the Valued, this one works...

both are in the Review directory:

[glehmann at pixel2 Insight]$ find Code/ -name  
itk*RegionalMaximaImageFilter*
Code/Review/itkRegionalMaximaImageFilter.h
Code/Review/itkRegionalMaximaImageFilter.txx
Code/Review/itkValuedRegionalMaximaImageFilter.h


>>
>> cause of "Maybe regional extrema is not exactly what you want  
>> though."
>> I want the 1 derivate of my 3D Image with extracted Regions (not in  
>> a ROI just in a Image in a List) to know how many watersheds i need  
>> to use or lay above it, or how to say...
>> (maybe im also just wrong in my thoughts and u know how to do it  
>> better :))
>>
> And to explain it better:
> My Image is (imho) defined as a 'model' of a Polynomial of n degrees  
> so i want a Polyonomial to fit into it, and then i want to get the  
> Polynomials extremas...
>


 From your last explanation, I still think that the regional maxima  
filter followed by the connected component filter would give you what  
you want.
But I don't understand the previous one, with the watershed. Maybe it  
would be easier with an image?

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

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