[PD] Body tracking

Pedro Lopes pedro.lopes at ist.utl.pt
Sun Jan 9 22:22:45 CET 2011


Completely agree with you cyrille.

the truth is: it depends on the purpose.



On Sun, Jan 9, 2011 at 12:37 AM, cyrille henry <ch at chnry.net> wrote:

>
>
> 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 <wallacechemical at gmail.com<mailto:
>> wallacechemical at gmail.com>> 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
>>
>>
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>>
>>
>> --
>> Pedro Lopes (MSc)
>> contact: pedro.lopes at ist.utl.pt <mailto:pedro.lopes at ist.utl.pt>
>>
>> website: http://web.ist.utl.pt/Pedro.Lopes
>>
>>
>>
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>


-- 
Pedro Lopes (MSc)
contact: pedro.lopes at ist.utl.pt
website: http://web.ist.utl.pt/Pedro.Lopes
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