[Insight-users] dilate and erode in 3D

[Irene Gonzálvez García]

Richard, thank you for your answer. I successfully run the algorithms 
the itkFlatStructuringElement in 4D, using a ball as the structuring 
element.
Now, I would like to implement a ball which has, in the 4th 
coordinate(time), all pixels from the center to the past time pixels 
equals to zero and the rest part of them equal to 1 (like a 
semi-ellipsis in the 4th dimension) . Basically, what I would like to 
avoid is the symmetry of the dilatation, making it asymmetric. Is it 
possible to implement it with the HISTO algorithm?, where is exactly 
this algorithm?, I couldn't find it in 
http://voxel.jouy.inra.fr/darcs/contrib-itk/consolidatedMorphology/ .

Best regards and thank you for your help
Irene



Richard Beare wrote:
> Hi,
>
> You could experiment with the consolidatedMorphology module from the
> insightjournal. We haven't experimented with 4D images, but I'd like
> to get it working on them. In theory they should work. This
> implementation will be the best way to go if you want larger
> structuring elements because it uses more efficient algorithms than
> the default. The two safest options will be the "Box" structuring
> element using VHGW algorithm or Ball using HISTO.
>
> On Thu, Mar 27, 2008 at 7:00 AM, Irene Gonzálvez
> <irenegonzalvezg at gmail.com> wrote:
>   
>> Dear Luis and all ITK-users,
>>
>> I am trying to make and erosion and dilation in 4D. First of all, I did in
>> 2D following one of the examples you provide us, but I could observe that
>> the BallStructuringElement is a 3x3 structuring element, in 2D. I checked
>> some previous mails (year 2006) and in an answer you gave to someone you
>> said that it wasn't implemented, but pobably now it has already done. Is it
>> ok? In case it wasn't, I will implement it and I would like to know if I can
>> send you the class to contribute with ITK.
>>
>> Thanks in advance
>> Best regards
>> Irene
>>
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>>     
>
>