<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
IOhannes m zmoelnig wrote:
<blockquote cite="mid4527E0BC.5060906@iem.at" type="cite">
<pre wrap="">David Powers wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi everyone,
I bought a cheap Logitech webcam to try motion detection with PD+Gem.
I'm considering, among others things, using this as part of a digital
instrument design.
First of all, the cheap webcam is of course rather noisy. But, the
motion detection doing:
[pix_movement 0.3]
l
[alpha]
l
[pix_blob]
definitely does seem to work okay.
I did a test using the X and Y to control FM synthesis however, and it
mostly worked but tended to produce a lot of noise when something was
moving. What is the recommended way to smooth out the signal a bit?
Also, best way to find the average speed of motion?
Finally, are there more advanced motion detection strategies? Like,
say, could I somehow put a bright red dot on my index finger, and just
detect where my index finger is? I'd love to hear what people have
done.
</pre>
</blockquote>
<pre wrap=""><!---->
so you want to do color tracking?
simplest thing is to just use the specified color-channel for [pix_blob]
(e.g. [pix_blob 1] should just track the Red channel of an RGB signal
(check the help-patch)).
this only works in trivial cases (red, green, blue, white); for a more
general approach convert the image's colorspace into hsv (with
[pix_rgb2hsv] and mask out all colours you don't want on the
colour-circle (e.g with [pix_curve]) and then track this.
once you only have the pixel of the desired colour, you can of couse
also do motion tracking on the color-filtered image.
i thought i had some example of colortracking added to the gem-examples
(but i might be wrong).
mfg,.asd
IOhannes
_______________________________________________
<a class="moz-txt-link-abbreviated" href="mailto:PD-list@iem.at">PD-list@iem.at</a> mailing list
UNSUBSCRIBE and account-management -> <a class="moz-txt-link-freetext" href="http://lists.puredata.info/listinfo/pd-list">http://lists.puredata.info/listinfo/pd-list</a>
</pre>
</blockquote>
do you know pdp_shape ?<br>
<br>
ciOa,<br>
<br>
sevy<br>
</body>
</html>