there is an interesting whitepaper on this topic: http://www.palindrome.de/d2/C13.pdf
Am 09.01.2011 um 01:37 schrieb cyrille henry: > > > Le 08/01/2011 20:24, Pedro Lopes a écrit : >> Not defending anything, but just to remind 60 fps of a pointgrey camera is >> not slow. > for gesture, i consider everything under 200Hz as slow. > including the wiimote 100Hz. > > by example, things like this have to be done at 1000Hz: > http://vimeo.com/9598075 > (we tried with slower system but it was not possible to be accurate enough). > > >> you probably will have a lot of trouble in dealing with 60 frames trying to >> cycle through your code every second. > you have problem analysing the image, but dealing with the data is no problem. > >> Accels and other hardware sensors are very useful too, and it very good >> results. > yep >> But not the best for 3d positioning of a point in space, > they will not provide any information regarding 3d positioning. > > > the question is what information do you really want... > 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. > if you want to track it's gesture, then you need something faster. faster > than a camera. > > >> but excellent at giving the rotation of that point in space (i.e.: accels, >> gyros). > yep. > > cyrille > >> >> :) >> >> On Sat, Jan 8, 2011 at 7:21 PM, marcello <[email protected] >> <mailto:[email protected]>> wrote: >> >> On 08/01/11 14:25, cyrille henry wrote: >> > hello, >> > >> > for the kung fu : movement are usually very fast. a camera is usually >> to >> > slow to be useful. >> > >> > i personally prefer using sensor like accelerometter on the body. >> > you can use wiimote or some other (faster) sensors system. >> > >> > here is a video of a performance i worked for few years ago. >> > http://vimeo.com/4596629 >> > sensors are used at time : 4'57 to 6'06 and from 6'43 to 7'23. >> > >> > at 6'43, you can see that this kind of sensors are lot's more accurate >> > that what you'll be able to do with a camera. >> >> That's a good point about the sensors, I didn't know this camera-latency >> problem. >> WHat kind of sensor have you used in your work ? >> Have you used wireless sensors ? >> >> > imo, camera are good to track body position. >> > kinect look to have a sensing zone that is a bit limited. >> >> A combination of the two could be an idea, but then it's complicated to >> merge the data... >> >> Thanks for the infos >> >> >> _______________________________________________ >> [email protected] <mailto:[email protected]> mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> >> >> >> >> -- >> Pedro Lopes (MSc) >> contact: [email protected] <mailto:[email protected]> >> website: http://web.ist.utl.pt/Pedro.Lopes >> >> >> >> _______________________________________________ >> [email protected] mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list
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