[Insight-users] GeodesicActiveContourShapePriorLevelSetImageFilter

[Matthias Ebert]

toluwalase lasaki schrieb:
> Hi all,
>  
Hi

I am also trying to use this filter and have the same questions as u. 
But i can help u out a bit:
> I am working on an image segmentation project and will like to use 
> the 'GeodesicActive ContourShapePriorLevelSetImageFilter'. I was 
> wondering if anyone is familiar with this filter and has used it 
> before for segmentation. A couple of questions:
>  
> - In what format must my prior shape image be? The example in the 
> software guide utilizes an input (CorpusCallosumMeanShape.mha) in 
> a .mha format. What kind of file is this and how can I open it to view it?
For more information about the file formats itk uses read this: 
http://itk.org/HTML/Data.htm
Especially the section about "Writing a  MetaImage header for raw data".
To view these files i wrote a simple itk application that reads the 
mha-files and writes png-files with the itk-reader and itk-writer. Maybe 
there is a better way, but thats how it works.
 
> - What exactly does the "shapemodefilepattern" input refer to? I don't 
> quite understand what this is and what it does? The example in the 
> software guide makes reference to principal components 
> CorpusCallosumMode0.mha, CorpusCallosumMode1.mha and
> CorpusCallosumMode12.mha. Can someone explain it with respect to these 
> 3 files?
The files are located in the Examples/Data directory. I copied them to 
my working directory, compiled the example and run it like this (now its 
getting ugly):
./mybinary BrainMidSagittalSlice.png outputimage.png 60 102 120 85 88 83 
6 1.0 10 10 CorpusCallosumMeanShape.mha 3 CorpusCollasumMode*.mha 50 50
With these parameters it is running right now but i am far from 
understanding why :)
Most parameters are from the ItkSoftwareGuide, but i am not sure about 
two scaling parameters and the startx and starty position.
>  
> - Also, how does one determine the 'numberofmodes' and where does this 
> information come from?
The number of modes i guessed because there are three 
CorpusCollasumMode[1-3] files.
>  
> - Finally, what do the "startX and startY" inputs refer to? Where do 
> these coordinates come from?
Dont know ...
>  
> If someone can also recommend some literature that I can read 
> or additional examples I can view  to help me better understand how 
> this filter works, that would be great.
That would be very useful.
And maybe some basic explaining of the filter and this example.
>  
> Thanks very much for your help.
>  
> Regards,
> OTL
>  

Hope this helped a bit!
Thanks for further information.

Regards,
Matthias