[Insight-users] structuring element for morphological operators

[Richard Beare]

This is a timely question. We are about to submit a paper to the
MICCAI workshop that covers this sort of thing. In particular an
updated version of the FlatStructuringElement class that we introduced
a while back. SE's like cubes and octagons can be decomposed into
lines and therefore implemented using much faster techniques than the
neighborhood iterator based approaches. For example, a cube can be
built using 3 orthogonal line operations. Methods exist for carrying
out a line dilation or erosion that have complexity independent of the
line length, which mean that a dilation by a cube can be carried out
in a time that is independent of cube size. These methods are
implemented in the code associated with the paper that will be
uploaded to InsightJournal in the next couple of hours.

On 7/6/07, Ehtiati, Tina (SCR US EXT) <tina.ehtiati.ext at siemens.com> wrote:
>
>
> Hello,
>
> I have questions related to the structuring elements used for morphological
> operations such as dilation and erosion.
> I have been using the BallStructuringElement with the
> itkGrayscaleErodeImageFilter and the itkGrayScaleDilateImageFilter. But now
> I need to build
> different kinds of structuring elements, for example cube of radius 12 and
> also 3D octagons. I would like to know how can I build a structuring element
> of
> my own design and use it along with the erosion and dilation filters. I read
> the example on the NeighborhoodIterator (the example of sobel filter), but
> still I cann't  figure out exactly what should I do?
>
> I would appreciate it if you could give me some hints!
>
> Thanks
>
> Tina
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users
>
>