[Insight-users] How to create a LabelMap or Label object

[Richard Beare]

Hi,

Do you mean that the points define the corners of a polygon region?
If so your best bet is to render this shape into an image and then
proceed to the measurement phase using the tools that have been
discussed in this thread. This may not sound optimal, but will
certainly be simplest and  actually quite fast - the translation to
connected component and measurement phases should only require one
image visit each. My suggestion is to see whether this does the  job
for you and worry about efficiency later. If you decide to make use of
the point information directly you will need to make a number of
decisions about how you deal with voxels along the borders etc. It
will probably get quite messy and time consuming.

On Fri, May 2, 2008 at 4:43 PM, Anja Ende <anja.ende at googlemail.com> wrote:
> Hi Xabi,
>
>  Thanks for the reply. However, is it not possible to create a label
>  simply based on the points. When the user delineates the object, I
>  usually have the connected points and it would be much more efficient
>  for me to use these points.
>
>  Cheers,
>  Anja
>
>  2008/5/1 Xabier Artaechevarria Artieda <xabiarta at unav.es>:
>  > Hi Anja,
>  >  Look at section 5.1 of the article. The easiest thing is to convert a label
>  > image or binary image (maybe this is your case) into a itk::LabelMap using
>  > itk::BinaryImageToLabelMapFilter or itk::LabelImageToLabelMapFilter.
>  >  Then, in your case, you will need to convert your image into a binary
>  > image.
>  >  And last, use the mentioned filter to convert it to a LabelMap.
>  >  Regards,
>  >  Xabi
>  >
>  >  --
>  >  Xabier Artaechevarria
>  >  Cancer Imaging Laboratory
>  >  Centre for Applied Medical Research
>  >  www.cima.es
>  >
>  >
>  >
>  >  Anja Ende <anja.ende at googlemail.com> ha escrito:
>  >
>  >
>  > >
>  > >
>  > >
>  > > Hi everyone,
>  > >
>  > > I had a question a few days back where I needed to perform some
>  > > statistics an irregular region of an image. Someone had pointed me to
>  > > the following submission:
>  > >
>  > >
>  > http://www.insight-journal.org/InsightJournalManager/view_reviews.php?back=index.php&pubid=176
>  > >
>  > > However, I am a bit confused on how to use it. So, if I understand
>  > > correctly, I need to create a LabelMap object.
>  > >
>  > > What I do have is the set of connected points (in image coordinates)
>  > > that make up my region and basically represents a closed 2D polygon or
>  > > surface. How can I use that information to create this LabelMap class?
>  > >
>  > > Any help would be really appreciated.
>  > >
>  > > Cheers,
>  > >
>  > > Anja
>  > > _______________________________________________
>  > > Insight-users mailing list
>  > > Insight-users at itk.org
>  > > http://www.itk.org/mailman/listinfo/insight-users
>  > >
>  > >
>  >
>  >
>  >
>  >  ----------------------------------------------------------------
>  >  Este mensaje ha sido enviado desde https://webmail.unav.es
>  >
>  >
>
>
>
>  --
>  Cheers,
>
>  Anja
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