[Insight-users] Fast access to slices of 3D image + problem with BinaryFillholeImageFilter

[Gaëtan Lehmann]

Hi,

This filter should work fine in N dimensions. Are you sure there is a  
real problem with the filter?
The fill holes transform is very sensible to any open pixel. In 3D, it  
may be difficult to see if a hole is open, but the algorithm won't  
miss it.

Using it in 2D in a 3D image is a perfectly valid usage, especially if  
the spacing in your image is not uniform - I'm almost always using  
that filter that way.
SliceBySliceImageFilter makes easy to apply a 2D filter in a 3D image.

Regards,

Gaëtan


Le 26 avr. 11 à 05:08, Bill Lorensen a écrit :

> In the example, did you change:
>  const int dim = 2;
> to
>  const int dim = 3;
>
>
> On Mon, Apr 25, 2011 at 9:13 PM, Tiago Brizolara da Rosa <yarroo at yahoo.com 
> > wrote:
> Hi all,
>
>     I would like to know if there is a fast way of manipulating a  
> slice of a 3D volume. Specifically, I want to apply a filter to  
> individual slices of a volume. The only way I know for doing that is  
> by, for each desired slice: applying a ExtractImageFilter and then  
> applying the filter I want to use to the slice image generated.
>     Is there a way for jumping this step (ExtractImageFilter)? For  
> example, if I wanted to manipulate the pixels of my desired slices,  
> I should use the ImageSliceIteratorWithIndex, so I wouldn´t need the  
> ExtractImageFilter. But what I want is to apply a filter to each  
> slice. Is it posible to do this without having to generate a new  
> image for each one with ExtractImageFilter?
>
>     Now the problem with BinaryFillholeImageFilter. In fact, the  
> reason for the above question comes from a workaround to the problem  
> with this filter.
>     I tried to use BinaryFillholeImageFilter in exactly the same way  
> as in the example file binary_fill_hole.cxx, but without success.  
> Then I noticed that it works fine if my image is two-dimensional (I  
> was trying to use in a 3D image read from a DICOM series). It was  
> not supposed to work in a 3D image?
>     I am using ITK 3.8.0 in Windows 7 and downloaded the code for  
> the morphology filters and samples from the Insight Journal´s article
> Label object representation and manipulation with ITK (http://www.insight-journal.org/browse/publication/176 
> ).
>
>     Well, as a workaround, I want to apply BinaryFillholeImageFilter  
> to all the individual slices of the volume. I think that generating  
> a 2D image for each one would be very painfull. This is the reason  
> for the first question of this e-mail.
>
>     Thanks in advance,
>
>     Tiago
>
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-- 
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.itk.org
http://www.mandriva.org  http://www.bepo.fr

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