[Sidefx-houdini-list] Surface from image stack

Michael K. O'Brien mobrien at pixar.com
Thu Feb 11 15:43:32 EST 2010


>-- On Thu, Feb 11, 2010 at 03:19:05PM -0500, Mark Elendt wrote:
> On Thursday Feb 11 at 14:46, Mark Bolstad wrote:
> > I have a stack of black and white images that consist of a set of
> > disconnected circle like shapes. First, how do you extract the boundary
> > curve(s) and pass them to a SOP?
> > 
> > Second, given a set of these extracted curves, I need to join them into a
> > surface (assume some fixed offset between the curves). The problem is that
> > in some cases I'll have two curves on one level and 1 curve on the next
> > level (the actual data is bifurcating somewhere in between the levels).
> > 
> > The application is reconstructing neurons from a set of electron microscopy
> > images.
> > 
> > Any help is appreciated.
> Could you make a volume (even an i3d file)?
> The ISO SOP with an inside/out expression?
> If the topology changes (i.e. you have two circles blending to one),
> that could be problematic.
> If you are guaranteed to have only one circle, then use the trace SOP
> and poly loft (or poly spline and skin).

Is there a way to get a true curve out of trace? Trace wants to surround each
pixel with a poly face, as opposed to generating a curve that connects the
pixels above the threshold, right?


> -- 
> Mark Elendt
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Michael O'Brien                                                         Tools
Pixar                                                       mobrien at pixar.com

Censorship is the mother of metaphor.
                            -Jorges Luis Borges

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