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From: ImageAnalyst <imageanalyst@mailinator.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Automatic segmentation
Date: Wed, 11 Jun 2008 07:34:30 -0700 (PDT)
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On Jun 11, 3:56=A0am, "J?rgen Kongsro" <jorgen.kong...@gmail.com> wrote:
> Thank you for your reply. Sorrt about the confusing part...
>
> I have tried the morphology by bwlabel and regionprops. The
> problem is that the organs, including the liver, stomach
> etc. does not have "solid" boundaries, so muscle tissue and
> internal organs are difficult to separate, even when
> performing erotion / dilation. I will try to work with size
> and regionprops, and maybe this will help...
>
> Thanks again for your reply, and I will check out the
> sci.image.processing.
>
> Regards
> J?rgen Kongsro

-----------------------------------
J?rgen:
OK it's becoming clearer.  You have several organs that are the same
gray level but they are connected, touching each other quite literally
(both physically in the body, and in the image), and it's difficult to
automatically determine the dividing line.  Yet you, with your expert
knowledge and experience, can see where you'd like to split them apart
but it's difficult to program that in.  In cases where the connection
is a small strand, you're trying morphological things like opening
operations or the watershed operation.  This can be a tough problem,
even more so in 3D.  Let's say you have a big oblong ellipsoid.  You
know they are two different organs but in the gray level image it's
just one giant blob of uniform intensity.  Maybe if there is no hint
of a indent or dividing line, you can just use your expert knowledge
to manually carve out the subvolume of the organ of interest with a 3D
program like Aviso (formerly called Amira).  Aviso has special tools
for doing this.
Good luck.
ImageAnalyst