[Insight-users] Questions about 3D Level Set Method

[Luis Ibanez]

Hi Jay,


What is your surface representation ?

I don't quite see how are you extracting a surface by doing
2D ridge detection along Z...

Is your surface a tube with the axis parallel to Z ?
in that case I would expect that you do 2D ridge detection
along XY and then connect ridges along Z.

Level Set are certainly a good option for filling holes,
however, depending on your surface representation, you
may find useful to use other simpler methods such as the
Voting filters:

http://www.itk.org/Insight/Doxygen/html/classitk_1_1VotingBinaryImageFilter.html
http://www.itk.org/Insight/Doxygen/html/classitk_1_1VotingBinaryHoleFillingImageFilter.html
http://www.itk.org/Insight/Doxygen/html/classitk_1_1VotingBinaryIterativeHoleFillingImageFilter.html


If your image looks more like an ultrasound (which probably
is to expect from a radar image...) you may consider some
model-based methods for extracting contours.

Maybe a screenshot of one of your images will help us to
understand the nature of your problem...


   Regards,


     Luis


-----------------
Jay Li wrote:

> Dear All,
> 
> Here I have some questions about ITK's level set classes. Our system is 
> a 3-D holographic radar. The image aquired is a 16-bit 256*256*224 
> "cloud" . We performed 2-D ridge detection of each slice along z axis 
> (1:224) to extract a "surface". Because of our radar's limitation, there 
> are a lot of holes and undesired points on the surface. Can level set 
> method smooth a 3-D surface? Can I input a volume data whose voxel 
> values are one at the ridge point and zero elsewhere as a target, and 
> use level set method to approximate a surface? Thanks.
> 
> Sincerely,
> 
> Jay
> 
> ------------------------------------------------------------------------
> Yahoo! Messenger
> Show us what our next emoticon should look like. Join the fun. 
> <http://us.rd.yahoo.com/evt=31855/*http://advision.webevents.yahoo.com/emoticontest> 
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users