[Insight-users] Peel an image

[Gib Bogle]

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 
> <mailto: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
>
>
>
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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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