[PD] Tracking color with GEM+Pdp

William Brent william.brent at gmail.com
Tue Jun 22 07:32:45 CEST 2010

Jaime Oliver did this color tracking extern a couple years ago:


On Mon, Jun 21, 2010 at 9:51 AM, Olivier Baudu <lamouraupeuple at gmail.com> wrote:
> Hi,
> I would like to track different colors at the same time with my web cam so
> I've try different way.
> I begun in GEM with [pix_movement] and/or [pix_alpha] and/or
> [pix_background]. It was quite good until I wanted only one tracking.
> With two, it begun more complicate to configure [pix_alpha] in RGBA to
> dissociate the spots.
> So, I've tried [pdp_ctrack] which is very powerful but in some situations it
> would be better to process only with moving pixel.
> I thought [pix_2pdp] would be the solution to use [pix_movement] before
> [pdp_ctrack] but it seem not to work with [pix_video] in RGBA colorspace,
> and in YUV I loose the color information after the [pix_movement] process...
> (By the way, I can't have simultaneously my webcam in GEM and in Pdp with
> [pix_2pdp], but, maybe, it's normal)
> What can I do ?
> Is there a [pix_movement] for Pdp I didn't find yet ?
> Is there a way to chose precisely the color to configure [pix_alpha] ?
> (maybe by converting the colorspace  with
> [pix_rgb2hsv] but what to do after ?).
> Of course, if you have a solution for tracking color without answering my
> questions, I'm still interested. :-p
> Thanks.
> 01ivier
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William Brent

“Great minds flock together”
Conflations: conversational idiom for the 21st century


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