[Insight-users] Label Image question again...

[Anja Ende]

Hi Xabi,

Thanks for your reply!

4. So, now the problem is how to compute a binary region from those
points. What do you want exactly? Is it the bounding box? You can get
this with SpatialObjects (BlobSpatialObject).

I actually need the shape that the points represent. It is not really
a rectangle but an irregular shape. I think the BlobSpatialObject
might be the thing that I need as it seems to be able to represent any
amorphous shape. I will give this a shot now!

Cheers,
Anja

2008/5/20 Xabier Artaechevarria Artieda <xabiarta at unav.es>:
> Hi Anja,
>
> Let's see if I can help a bit with some points.
>
> 1. The article you mentioned is an Insight Journal contribution. As such, it
> includes the code needed to reproduce the results. You need this code, which
> you can find in
> http://insight-journal.org/InsightJournalManager/view_reviews.php?pubid=176.
> This includes the LabelImage class, the classes to convert different images
> to a LabelMap, and so on.
>
> 2. At least that I know, there is no straighforward way to create a
> LabelImage based on a user defined contour. What you need, though, is a
> LabelMap.
>
> 3. You must do it in two steps. First convert your points to binary image,
> and then this image to a label map. You can convert a Binary image to a
> label map easily with the itkBinaryImageToBinaryMapFilter.
>
> 4. So, now the problem is how to compute a binary region from those points.
> What do you want exactly? Is it the bounding box? You can get this with
> SpatialObjects (BlobSpatialObject).
>
> Hope that helps,
> Xabi
>
> --
> Xabier Artaechevarria
> Cancer Imaging Laboratory
> Centre for Applied Medical Research
> www.cima.es
>
>
>
> Anja Ende <anja.ende at googlemail.com> ha escrito:
>
>> Hi all,
>>
>> I am really frustrated at my inability to achieve this and hope
>> someone can help me with a few lines of code on how to achieve this:
>>
>> - I have an itk::Image object and a set of points in the image
>> coordinates that represent a ROI.
>> - I cannot for saving my life figure out how to generate a LabelObject
>> based on this.... I have had some help when I asked this question
>> before but there seems to be a disconnect somewhere and I am missing a
>> step.
>>
>> I guess I have to figure out a way to render the region defined by
>> these points into another image and somehow use this image as a mask
>> on the original image. However, I just do not know how to achieve this
>> with the ITK classes. The document entitled "Label Object
>> representation and manipulation with ITK" somehow (I think) assumes
>> that the LabelImage is easily created, but I am finding it very
>> difficult to actually create this LabelImage!
>>
>> Is there any documentation on how one can create a LabelImage based on
>> a user defined contour???
>>
>> Please help!
>>
>> --
>> Cheers,
>>
>> Anja
>> _______________________________________________
>> Insight-users mailing list
>> Insight-users at itk.org
>> http://www.itk.org/mailman/listinfo/insight-users
>>
>
>
>
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-- 
Cheers,

Anja