[Insight-users] Peel an image

[Dženan Zukić]

I don't think there is any stock filter which does what you want. And I
still don't understand your situation. Can you show us an example slice and
wanted result?


On Wed, May 22, 2013 at 10:50 PM, Gib Bogle <g.bogle at auckland.ac.nz> wrote:

>  The reason why I don't think erode will work is that the part of the
> image that contains the information of interest is made up of many
> disconnected pieces, not very different from the boundary layer that I want
> to remove.  The only thing that I can use to distinguish the pixels that
> need to be removed is that they are near the outside of the region.  If I
> apply erosion I will remove many small but important features (this is
> labelled vasculature, and I do not want to lose fine capillaries).
>
> Gib
>
>
> On 22/05/2013 11:12 p.m., Dženan Zukić wrote:
>
>
> http://www.itk.org/Doxygen/html/group__MathematicalMorphologyImageFilters.html
>
>  What you probably want to do is BinaryErode and BinaryDilate.
>
>
> On Wed, May 22, 2013 at 7:04 AM, gib <g.bogle at auckland.ac.nz> wrote:
>
>> It's hard to know what to call the processing I want to apply.  I have a
>> set
>> of biological images (actually a 3D image, but for now I'm happy to
>> process
>> the frames one-by-one) in which the region of interest has an irregular
>> and
>> incomplete labelled layer around the boundary.  The staining of the layer
>> was unintended, and its presence interferes with the segmentation that I
>> am
>> doing.  The part of the image that I want to extract is made up of many
>> disconnected objects, and there is not much difference in the intensity
>> ranges of the objects of interest and the unwanted edge.  I am willing to
>> trim a few pixels off the boundary all the way around - this will not
>> cause
>> much loss of information.  What I need is way to determine a sequence of
>> pixels that in some sense defines the extent of the labelled region in the
>> image, rather like a 2D shrink wrapping.  I could then use this to shave
>> or
>> peel off the outer layer of pixels.
>>
>> Does this process have a name?  Are there any existing filters or code to
>> do
>> this?  Any clever suggestions (I have some ideas)?
>>
>> Thanks
>> Gib
>>
>>
>>
>> --
>> View this message in context:
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>
>
>
> --
> Dr. Gib Bogle
> Senior Research Fellow
> Auckland Bioengineering Institute
> University of Auckland
> New Zealand
> http://www.bioeng.auckland.ac.nz
> g.bogle at auckland.ac.nz
> (64-9) 373-7599 Ext. 87030
>
>
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