[Insight-users] Medial curve extraction (itk::MedialCurveImageFilter)

[Sergio Vera]

Pedro,
what image are you passing as input to the filter?

MedialCurveImageFilter requires a distance map in order to work properly.
Even more, you need to supply a smoothed distance map in. Although not
explicitly specified in the insight journal article, in the code example you
can see how it is done. My experience is that unsmoothed distance map does
not work, and that a gaussian blurred dist map is required.

Hope it helps

On Tue, May 24, 2011 at 12:16 AM, Daniel Blezek <Blezek.Daniel at mayo.edu>wrote:

>  Pedro,
>
>   We’ve found the MedialCurve method to be very sensitive, and difficult to
> use correctly.  In contrast, the BinaryThinningImageFilter3D (also from an
> Insight Journal article), does a very nice job.
>
> -dan
>
>
>
> On 5/23/11 3:26 PM, "Pedro Névoa" <pedronevoa at gmail.com> wrote:
>
> Hello,
>
> I'm trying to reduce a femur to a simple line, in order to achieve an image
> of the femur's medial axis. I tried to use the MedialCurve method to
> accomplish this but no results were obtained.
>
> The pixel type of the input image is signed short. I realize that the input
> pixel type accepted by Medial Curve is float so I changed the pixel type of
> my image to float using ImageReadCastWrite but it kept on not giving any
> results - the algorithm is processed endlessly.
>
> Does anyone know what may be the problem?
>
> Grateful for your attention,
>
>
> --
> *Daniel Blezek, PhD
> *Medical Imaging Informatics Innovation Center
>
> P 127 or (77) 8 8886
> T 507 538 8886
> E blezek.daniel at mayo.edu
>
> Mayo Clinic
> 200 First St. S.W.
> Harwick SL-44
> Rochester, MN 55905
> mayoclinic.org
> "It is more complicated than you think." -- RFC 1925
>
> _____________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Kitware offers ITK Training Courses, for more information visit:
> http://www.kitware.com/products/protraining.html
>
> Please keep messages on-topic and check the ITK FAQ at:
> http://www.itk.org/Wiki/ITK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.itk.org/mailman/listinfo/insight-users
>
>


-- 
Sergio Vera

 Alma IT Systems
 C/ Vilana, 4B, 4º 1ª
 08022 Barcelona
 T. (+34) 932 380 592
 www.alma3d.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.itk.org/pipermail/insight-users/attachments/20110524/50d91fa3/attachment.htm>