[Insight-users] Segmentation -> Spatial objects

[Dan Mueller]

Hi David,

You are correct: there are no filters (at least none that I know of)
which explicitly create SpatialObjects. However, if you want to deal
with SpatialObjects, it should be trivial to create them using the
output of your specific filters. For example: say you are using a
filter which extracts a PolylineParametricPath defining a road, then
you can easily create a LineSpatialObject from the path.

I guess it comes back to your original question: so what's the point
of SpatialObjects? From my understanding, there are three main uses
for spatial objects:
   1. Input/output: MetaIO supports reading and writing SpatialObjects
   2. Rendering as a scene graph: see http://www.vtk.org/Wiki/SOViewer
   3. Registration: see Code/Algorithms/itkImageToSpatialObjectMetric.h

Hope this helps.

Regards, Dan

2008/8/8 David Dubois <dubois at enst.fr>:
>
> Hi Dan,
>
> I'm trying to extract lines and rectangular shapes from a 2d satellite
> image.  I'm using ITK from the Orfeo Toolbox (OTB) which is a extension
> of ITK specialized in satellite images.
>
> I did not see any filter that states it extracts spatial objects from
> images.
>
> Thank you for your help,
>
> DD
>
>
> Dan Mueller wrote:
>> Hi David,
>>
>> What spatial object type did you have in mind?
>>
>> ITK is capable of extracting meshes, contours, paths, tubes, and more.
>> However, these methods are highly application dependant. Please
>> provide more information regarding your exact situation. For example:
>> what dimension of images are you using: 2D, 3D, 4D? What type of
>> image: CT, MR, PET, satellite? What type of object are you trying to
>> segment: liver tumor, coronary artery, road?
>>
>> Cheers, Dan
>>
>> 2008/8/7 David Dubois <dubois at enst.fr>:
>>
>>> Hi,
>>>
>>> I was wondering if there was a way to go from image to spatial objects
>>> using itk's various segmentation filters.  Like maybe a Label to Spatial
>>> Object king of filter.  I searched for this in the documentation without
>>> success.  I really dont see the use of spatial objects if you always
>>> have to define them manually.
>>>
>>> Thank you,
>>>
>>> DD
>>> _______________________________________________
>>> Insight-users mailing list
>>> Insight-users at itk.org
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>>>
>>>
>>
>>
>
>