[Insight-users] Contour extraction

[Luis Ibanez]

Hi Preben,

Thanks for the clarification.

It look then like you can take advantage of the
Canny Edge Detector, as Sergio suggested.

You may want to look at the example in :

       Insight/Examples/Filtering/
              CannyEdgeDetectionImageFilter.cxx


As usual,
some parameters fine-tunning will be required
for your specific images.


   Regards,


         Luis


-------------------------------------------------------------------------------------------------
On Thu, Mar 18, 2010 at 3:55 PM, Preben <64bit at mailme.dk> wrote:
> Hi again
>
> Well, the problem is not related to organs, vessels or anything inside
> human beings.
>
> I'm trying to extract arbitrary shapes of "edges" in an image: contours.
> I don't need the contours to be closed - they can be open - no problem.
> The input could e.g. be a cup where I would like to extract the sharp
> edges on the cup and the contours formed by the difference between the
> cup and the background.
>
> So, in this example, the boundaries of the cup are very interesting and
> the internal edges/contours of the cup are of interest. I only have one
> picture as an input and one picture as output.
>
>
> - Preben
>
>
> Luis Ibanez wrote:
>> Hi Preben,
>>
>> Please give a description of the kind of input image that you have
>> and the kind of segmentation that you want to perform.
>>
>> Are you trying to extract linear structures ? (tubes, blood vessels ?)
>>
>> or
>>
>> Are you trying to extract boundaries of large organs ? (livers, kidneys)?
>>
>>
>>    Please be more concise,
>>
>>    Image segmentation is a very large field....
>>
>>
>>
>>        Thanks
>>
>>
>>              Luis
>>
>>
>> -----------------------------------------------------------------
>> On Thu, Mar 18, 2010 at 5:51 AM, Preben <64bit at mailme.dk> wrote:
>>
>>> Hi
>>>
>>> I'm wondering if it is possible to extract all the contours of the image
>>> automatically.
>>>
>>> I've read in the document Fast Marching Minimal Path Extraction in ITK
>>> (http://ezctwsgi.maxturnheim.webfactional.com/site_media_ezct/projects/matsur/jell/jell_matsur_aou_12_hea_dr_10_d.pdf),
>>> that it is possible to extract a path given an image, a socalled speed
>>> function and a start point and end point. However, I'm interested in all of
>>> the contours of the image - and the start point is not really that
>>> interesting.
>>>
>>> Is this possible?
>>>
>>>
>>> Best regards
>>> Preben
>>>
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>