[Insight-users] make an initial level-set

[Toon Huysmans]

Thanks for the replies,

   You`ve got it cleared out.

Toon.
----- Original Message ----- 
From: "Charl P. Botha" <c.p.botha at ewi.tudelft.nl>
To: "Toon Huysmans" <denhuys at hotmail.com>
Cc: <insight-users at itk.org>
Sent: Wednesday, May 26, 2004 1:17 PM
Subject: Re: [Insight-users] make an initial level-set


> Toon Huysmans wrote:
> >     I think I have a very simple question: how do I make an initial
> > level-set form a binary image, where black is outside and white is
> > inside the initial segmentation.
> >
> >     Can I directly use the binary image or should I make it a disctance
map?
>
> The 0-value level-set of you initial level-set function should be the
> interface that you want to involve. Your initial level-set function does
> not have to be a distance field (the ITK level set code will take care
> of creating the distance field).
>
> In other words, for your specific binary image, change the white inside
> your object to -1 and the black outside to 1.  The convention is < 0 on
> the inside and > 0 on the outside.  This means for example that a
> positive propagation factor will result in an outwards (i.e.
> inflationary) propagation speed term.
>
> HTH,
> Charl
>
> -- 
> charl p. botha http://cpbotha.net/ http://visualisation.tudelft.nl/
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