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

[Xabier Artaechevarria Artieda]

You can use:

http://www.itk.org/Doxygen34/html/classitk_1_1SpatialObjectToImageFilter.html

However, that will give you separate points, not a contiguous  
irregular binary shape.
I do not know of any filter that can do that, it might be that you  
have to implement this.

Maybe somebody can help here?

-- 
Xabier Artaechevarria
Cancer Imaging Laboratory
Centre for Applied Medical Research
www.cima.es



Anja Ende <anja.ende at googlemail.com> ha escrito:

> Hi,
>
> Actually spoke too soon! Do not see how I can convert this
> BlobSpatialObject to a binary itk::Image.
>
> It seems to be very difficult to be able to create a binary image by
> hand unless you use one of the itk filters...
>
> Cheers,
> Anja
>
> 2008/5/20 Anja Ende <anja.ende at googlemail.com>:
>> 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
>>
>
>
>
> --
> Cheers,
>
> Anja
>



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