[PD] video bluescreen

mark edward grimm mgrimm at syr.edu
Wed Feb 11 14:19:15 CET 2009

> Mark, managed to see yours working, yep
> its pretty raw but it's a start which is what I needed.

hey if you get it optimized can you send me the result? my time is really limited lately but i would love to give a demo to my class this semester with your results. i still have not tried it on our own green screen yet for lack of time...

glad i was a little useful!



--- On Mon, 2/9/09, Garrett Lynch <lists at asquare.org> wrote:

> From: Garrett Lynch <lists at asquare.org>
> Subject: Re: [PD] video bluescreen
> To: pd-list at iem.at
> Date: Monday, February 9, 2009, 2:02 PM
> Hi
> Apologies for the slowness of my reply.  Thanks both for
> the examples.  I couldn't get pix_background working Ben
> but it seems to be not what I'm looking for on this
> occasion anyway.  Mark, managed to see yours working, yep
> its pretty raw but it's a start which is what I needed. 
> Many thanks.
> a+
> gar
> > You don't actually load a base image into
> pix_background, you send a [reset( message to the
> [pix_background] object and it takes a snapshot of
> whatever's in front of the connected camera (or incoming
> video stream).  Then it compares all incoming frames with
> that snapshot and outputs anything that's different
> between the two.  The right inlet sets the threshold and
> takes an RGB value, so you will have to adjust this to
> reduce inevitable noise and artifacting.  I have attached a
> very basic version of this patch I've described.  I
> don't have a cam attached to this computer and don't
> have the time to test it, but it should work.
> > 
> > -Ben
> >
> http://megrimm.net/software/green-screen-pd-0.01/green-screen-pd.zip
> > 
> > this sort of works although its still pretty sloppy.
> didn't try with screen yet but with the help of iohannes
> and jacks color picker examples one should be able to key
> out any solid color from a video just by selecting it in a
> gem window.
> > 
> > works on my side on osx.
> > 
> > mark
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