Cycling 74 » Topic: "vectorizing" a silhouette?

"vectorizing" a silhouette?

David Beaudry — Thu, 06 May 2010 19:00:13 +0000

Hi all,

I’m trying to figure out the best approach here. I’m working on a project doing some IR video tracking (certainly not a problem there…been doing it for quite some time now!). While doing some testing I projected the image/silhouette of what it was I was tracking. Well…now it’s part of the show (not too unlike the ipod silhouette commercials). The problem is two things, tho: first, I need to smooth out the edges a bit (been using a combo of cv.jit.dilate/erode with some success, but not much), then be able to blow up the image to ~2 times the resolution of my camera, and not have it pixel-y. Seems that basically I need to start with the silhouette I’m using for tracking and use that as a basis to draw a new silhouette in GL, then enlarge the GL-based silhouette as need. But I have no idea really where to go from here. Does any one have any pointer to objects, shaders, tutorials, methods, etc. that I could start looking thru?

Thanks in advance for any pointers!
David

Re: “vectorizing” a silhouette?

Rob Ramirez — Thu, 06 May 2010 19:05:18 +0000

i think utilizing the gauss blur shader will do the trick, no?
Max5/examples/jitter-examples/render/slab/jit.gl.slab.gauss6x-example.maxpat

Re: “vectorizing” a silhouette?

David Beaudry — Thu, 06 May 2010 19:14:04 +0000

drrr. yes. that does work quite lovely.
Thanks, Rob.
David

Re: “vectorizing” a silhouette?

David Beaudry — Thu, 20 May 2010 05:59:47 +0000

OK, I have a follow-up question ;)
I’m really liking the look of the vignette shader by Andrew. Is it possible to apply that type of fade to the edges of a silhouette? a little @silhouette attribute?;)

Thanks for any pointers!

Re: “vectorizing” a silhouette?

David Beaudry — Thu, 20 May 2010 07:19:39 +0000

or maybe something like the edgeblend shader, but he edges are moving (and most certainly not linear).
thanks.
db