[PD] Fwd: Need help for motion tracking

Hans-Christoph Steiner hans at eds.org
Wed May 24 13:01:55 CEST 2006


On May 23, 2006, at 11:47 PM, Tomi Dufva wrote:

>>
>> Does anyone have good suggestions for this kind of problem:
>>
>> We are doing simple interactive sound installation for one  
>> gallery, where webcam is used for motion tracking and then the  
>> tracked values are  being used to trigger sounds and alter them.  
>> we are using 4 speakers, and alltogether playing 2stereo files at  
>> most.
>>
>> Problems we have:
>> 1.a good motion tracker patch, only one we have found is the one  
>> example patch in gem. This is ok, but if anyone has better we are  
>> happy to hear about it.

First off, motion tracking with video is limited, don't expect  
amazing results, because no one in the world is getting them.  If you  
are serious about motion tracking, then you need to have a high- 
quality camera, not a webcam, they are too noisy.  Also, you'll have  
much better results if you use a black&white camera with an infrared  
filter.  Color cameras generally filter out infrared, so they won't  
work.

These projects use this kind of camera setup:

http://www.iua.upf.es/mtg/reacTable/
http://tmema.org/messa/messa.html
http://thesystemis.com/drawnInstallation/


>> 2. playing soundfiles, we are looking for a patch to play wav or  
>> mp3 or aiff files where we could change the speed, etc. easily.
>>
>> 3. And then we are looking some interesting things to alter the  
>> soundfiles. The soundfiles are rather long recordings of rain, so  
>> normal sample players wont work.

My current favorite is feeding strange numbers into [fdn~] from  
creb.  You can get an example patch from Day 3 - Sound:

http://puredata.org/docs/workshops/walcheturm06

.hc

>>
>> If you know some ideas we would be happy to hear about them! Thank  
>> you!
>>
>> ps. we are using mac mini 1,25ghz wiht 1giga of ram and running os  
>> x 10.4.6 and pd 0.39.2-extended test3
>>
>>
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