[Insight-users] about initial level set

[Iván Macía]

Hi all,

The same thing happens to me with intensity 255 for the object and 0 for the
background. Is this the correct behaviour? In the software guide the
level-set function is positive inside and negative outside the zero
level-set. Shouldn't this be consistent with the fact that the foreground
(object) value is higher than the background value?

Thanks in advance

Ivan


> -----Mensaje original-----
> De: insight-users-bounces+imacia=vicomtech.es at itk.org 
> [mailto:insight-users-bounces+imacia=vicomtech.es at itk.org] En 
> nombre de Michal Postrozny
> Enviado el: jueves, 16 de junio de 2005 23:00
> Para: luis.ibanez at kitware.com; insight-users at itk.org
> Asunto: Re[3]: [Insight-users] about initial level set
> 
> 
> Hello Luis,
> 
> After setting intensity of -1 for the segmented object 
> (inside) and 1 for background (outside) everything works 
> fine. Sorry for bothering you.
> 
> Regards
> 
> Michal Postrozny
> 
> > Hello Luis,
> 
> > You have said that there is no need to do anything with the binary 
> > image, just feed it to the level set filter. I've tried to 
> feed binary 
> > image with intensities of 255 for segmented object and zero for 
> > background to the GeodesicActiveContourLevelSetImageFilter. 
> But this 
> > doesn't work. I must be missing something important. After applying 
> > ApproximateSignedDistanceMapImageFilter to the binary image and 
> > feeding it to the geodesic everything works fine. But 
> > ApproximateSignedDistanceMapImageFilter is rather slow, so 
> if it was 
> > possible to feed binary image directly to geodesic it would 
> be great. 
> > How can I achieve this?
> 
> > Thanks in advance
> 
> > Michal Postrozny
> 
> 
> 
> 
> >> Yixun,
> 
> 
> >> Don't need to do anything particular.
> 
> >> You can feed your binary image directly as input level set.
> 
> 
> >> Regards,
> 
> 
> >>     Luis
> 
> 
> >> ----------------
> >> Yixun Liu wrote:
> 
> >>> Hi,
> >>>  
> >>> I have a  segmented image represented by binary image. I 
> want to use 
> >>> level set to refine the segmentation based on the 
> segmented image. 
> >>> How to generate a initial level set based on this binary image?
> >>>  
> >>> Best regards,
> >>>  
> >>> Yixun Liu
> >>> 
> >>> 
> >>> 
> --------------------------------------------------------------------
> >>> ----
> >>> 
> >>> _______________________________________________
> >>> Insight-users mailing list
> >>> Insight-users at itk.org 
> >>> http://www.itk.org/mailman/listinfo/insight-users
> 
> 
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