Hello all,<div><br></div><div>I'm new to this list... I've just started out with PD, with body-tracking in mind actually. </div><div><br></div><div>I'm working with the kinect - you can get it working on your OS of choice, via the wonderful community effort at:</div>
<div><a href="http://openkinect.org/wiki/Main_Page" target="_blank">http://openkinect.org/wiki/Main_Page</a></div><div><br></div><div>Seems like a natural fit for PD, and people are actually connecting it to the OpenNI project here: <a href="http://www.openni.org/">http://www.openni.org/</a></div>
<div><br></div><div>and there are some other skeleton tracking efforts that have been discussed on the openkinect google group.</div><div><br></div><div>Hope this helps!</div><div><br></div><div>Best,</div><div>Ali</div>
<div>
<br><br><div class="gmail_quote">
On Mon, Jan 10, 2011 at 6:06 AM, Jaime Oliver <span dir="ltr"><<a href="mailto:jaime.oliver2@gmail.com" target="_blank">jaime.oliver2@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><div style="color:rgb(80, 0, 80)"><div><div>> <span style="border-collapse:separate;color:rgb(0, 0, 0);font-family:arial;font-size:small">the truth is: it depends on the purpose. </span></div>
<div><span style="border-collapse:separate;color:rgb(0, 0, 0);font-family:arial;font-size:small"><br></span></div></div><div><span style="border-collapse:separate;color:rgb(0, 0, 0);font-family:arial;font-size:small">Nothing Truer...</span></div>
<div>
<div><br></div><div>>> Not defending anything, but just to remind 60 fps of a pointgrey camera is not slow.</div></div></div><div>>for gesture, i consider everything under 200Hz as slow.</div></span><div>
<span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br>
</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">surely this is the case for percussion as in your example here:</span></div><div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br>
> by example, things like this have to be done at 1000Hz:<br>> <a href="http://vimeo.com/9598075" style="color:rgb(28, 81, 168)" target="_blank">http://vimeo.com/9598075</a><br></span><br></div></div><div>However, with a minimum of 75fps with a ps3 camera (you can get up to 120fps at 320x240...) you can get very responsive results:</div>
<div><a href="http://www.jaimeoliver.pe/sc2" target="_blank">www.jaimeoliver.pe/sc2</a></div><div><br></div><div>It is clear that this project is not as concerned with precise triggers, it is more concerned with continuous control...</div>
<div><br></div><div><div>you just need to find out if what these space&temporal resolutions offer you what you're looking for. (+ solving less robust lighting, which is what really determines if video tracking is the way to go...)</div>
</div><div><br></div><div>best,</div><div><br></div><div>J</div><div><br></div><div><br></div><div><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div></div><div>
<div><br></div><div><div><br></div><div><div><div></div><div><br><br><div class="gmail_quote">On Sun, Jan 9, 2011 at 12:37 AM, cyrille henry <span dir="ltr"><<a href="mailto:ch@chnry.net" target="_blank">ch@chnry.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
<br>
Le 08/01/2011 20:24, Pedro Lopes a écrit :<div><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Not defending anything, but just to remind 60 fps of a pointgrey camera is not slow.<br>
</blockquote></div>
for gesture, i consider everything under 200Hz as slow.<br>
including the wiimote 100Hz.<br>
<br>
by example, things like this have to be done at 1000Hz:<br>
<a href="http://vimeo.com/9598075" target="_blank">http://vimeo.com/9598075</a><br>
(we tried with slower system but it was not possible to be accurate enough).<div><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
you probably will have a lot of trouble in dealing with 60 frames trying to cycle through your code every second.<br>
</blockquote></div>
you have problem analysing the image, but dealing with the data is no problem.<div><br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Accels and other hardware sensors are very useful too, and it very good results.<br>
</blockquote></div>
yep<div><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
But not the best for 3d positioning of a point in space,<br>
</blockquote></div>
they will not provide any information regarding 3d positioning.<br>
<br>
<br>
the question is what information do you really want...<br>
if you want the position of someone in space, then you have to use a camera. but you can also track he's movement with a wacom.<br>
if you want to track it's gesture, then you need something faster. faster than a camera.<div><br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
but excellent at giving the rotation of that point in space (i.e.: accels, gyros).<br>
</blockquote></div>
yep.<br>
<br>
cyrille<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
:)<div><br>
<br>
On Sat, Jan 8, 2011 at 7:21 PM, marcello <<a href="mailto:wallacechemical@gmail.com" target="_blank">wallacechemical@gmail.com</a> <mailto:<a href="mailto:wallacechemical@gmail.com" target="_blank">wallacechemical@gmail.com</a>>> wrote:<br>
<br>
On 08/01/11 14:25, cyrille henry wrote:<br>
> hello,<br>
><br>
> for the kung fu : movement are usually very fast. a camera is usually to<br>
> slow to be useful.<br>
><br>
> i personally prefer using sensor like accelerometter on the body.<br>
> you can use wiimote or some other (faster) sensors system.<br>
><br>
> here is a video of a performance i worked for few years ago.<br>
> <a href="http://vimeo.com/4596629" target="_blank">http://vimeo.com/4596629</a><br>
> sensors are used at time : 4'57 to 6'06 and from 6'43 to 7'23.<br>
><br>
> at 6'43, you can see that this kind of sensors are lot's more accurate<br>
> that what you'll be able to do with a camera.<br>
<br>
That's a good point about the sensors, I didn't know this camera-latency<br>
problem.<br>
WHat kind of sensor have you used in your work ?<br>
Have you used wireless sensors ?<br>
<br>
> imo, camera are good to track body position.<br>
> kinect look to have a sensing zone that is a bit limited.<br>
<br>
A combination of the two could be an idea, but then it's complicated to<br>
merge the data...<br>
<br>
Thanks for the infos<br>
<br>
<br>
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Pedro Lopes (MSc)<br></div>
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</blockquote></div><br><br clear="all"><br></div></div>-- <br><div>Pedro Lopes (MSc)<br>contact: <a href="mailto:pedro.lopes@ist.utl.pt" target="_blank">pedro.lopes@ist.utl.pt</a><br></div><div>website: <a href="http://web.ist.utl.pt/Pedro.Lopes" target="_blank">http://web.ist.utl.pt/Pedro.Lopes</a> <br>
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<br></div></blockquote></div><br><br clear="all"><br>-- <br>Jaime E Oliver LR<br><br><a href="http://www.jaimeoliver.pe" target="_blank">www.jaimeoliver.pe</a><br><br>858 750 0924 (cel)<br>858 202 1522 (home)<br>
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