[Insight-users] about initial level set

[Iván Macía]

Hi Michal,

I didn't have time to come back to the issue until today. In my case, as I
generate the Initial Level-set in a previous stage of the pipeline (as a
binary image) is enough (and faster) to set the output image pixel type of
the BinaryThresholdImageFilter to float, char or short and then setting
inside value to -1 and outside value to 1 and then feed it directly to the
level-set image filter.

Thanks for your help

Iván
 

> -----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 Sandarak
> Enviado el: viernes, 17 de junio de 2005 18:53
> Para: Iván Macía; insight-users at itk.org
> Asunto: Re[5]: [Insight-users] about initial level set
> 
> 
> Hello Ivan!
> 
> I've feed my image (255 for object and 0 for background) first to:
> 
> itkIntensityWindowingImageFilter with settings:
> 
> ->SetOutputMinimum( 1024 );
> ->SetOutputMaximum( -1024 );
> 
> This has photographic negated my image to  0 for object and 
> 255 for background
> 
> then I've run:
> 
> itkRescaleIntensityImageFilter with:
> 
> ->SetOutputMinimum(-1);
> ->SetOutputMaximum(1);
> 
> As an output I have image with -1 for inside and 1 for outside.
> 
> This works well as input for level set filters like geodesic.
> 
> Regards
> 
> Michal Postrozny
> 
> 
> 
> > 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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