[Insight-users] Gradient Vector Field and Level Set

[Luca Antiga]

Hey Diana,
  you should set the vector image using the SetAdvectionImage method.
The template parameter for the FeatureImageType has to be a scalar  
image of the same type of your gradient (take a look at the source  
code for the filter).
I'm in a bit of a rush now, please get back to me if you don't  
succeed and I'll give you step by step instructions.
Regards

Luca



On Nov 13, 2008, at 5:31 PM, droettger at uni-koblenz.de wrote:

> Hey,
>
> do you mean that I should declare the feature image, the input of
> GeodesicActiveContourLevelSetImageFilter, as the output of the
> GradientVectorFlowImageFilter?
>
> I defined a GradientImageType:
> typedef itk::CovariantVector< double, 3 >  GradientPixelType;
> typedef itk::Image< GradientPixelType, 3> GradientImageType;
>
> Hence, the definition of GeodesicActiveContourLevelSetImageFilter is:
>
> typedef itk::GeodesicActiveContourLevelSetImageFilter<  
> InternalImageType,
> 	GradientImageType > GeodesicActiveContourFilterType;
>
> Am I right? That doesn't work in my case.
> How should I integrate the vector field?
>
> Thanks,
> Diana
>
>
>
>> Hi Diana,
>>  you should use it as the advection field in the
>> GeodesicActiveContourLevelSetImageFilter, rather than speed.
>> Best regards
>>
>> Luca
>>
>> 2008/11/13, droettger at uni-koblenz.de <droettger at uni-koblenz.de>:
>>> Hi,
>>>
>>> I want to include the itkGradientVectorFlowImageFilter into a  
>>> level set
>>> approach, using the ShapeDetectionLevelSetImageFilter.
>>> The gradient diffusion, resulting out of GVF should perform an  
>>> external
>>> force, in terms of the level set speed function.
>>>
>>> My question is, if I can simply use the output of
>>> itkGradientVectorFlowImageFilter as the speed image, since it is a
>>> vector
>>> field, and needs a diffrent approximation than a scalar image.
>>>
>>>
>>> Thanks in advance,
>>> Diana
>>>
>>> _______________________________________________
>>> Insight-users mailing list
>>> Insight-users at itk.org
>>> http://www.itk.org/mailman/listinfo/insight-users
>>>
>>
>> --
>> Inviato dal mio dispositivo mobile
>>
>> Luca Antiga, PhD
>>  Biomedical Technologies Laboratory
>>  Biomedical Engineering Department,
>>  Mario Negri Institute
>> mail: Villa Camozzi, 24020, Ranica (BG), Italy
>> phone: +39 035 4535-381
>> email: antiga at marionegri.it
>> web: http://villacamozzi.marionegri.it/~luca
>>
>
>
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