Tom,
My former company Ubisense is doing some cool stuff in this space - see
www.ubisense.net. (In the interest of full disclosure, I still have some
equity in the company). When I was there we looked at automating lighting
systems so that spotlights could automatically follow actors on stage. I'm
not sure if this ended up getting implemented anywhere yet but you could
check with the Ubisense guys.
When I was working on this stuff, I found it surprising what a hard problem
it is to accurately track stuff indoors. Reflections (multipath) and signals
blocked by people, furniture or other objects tend to cause a lot of false
readings. We were using ultrawideband (UWB) signals which have some
characteristics that help overcome these issues. One challenging thing about
doing stage lighting is that movement is not smooth so it's more challenging
to using filtering / smoothing techniques to cut out false readings. If
you're say tracking a horse rider to enable video tracking, they will
generally move pretty smoothly so filtering probably works well. If you have
someone standing still on a stage you might want quite a bit of "damping" of
the location reading so the spotlight doesn't jitter. But then if they
suddenly move you want the spotlight to move immediately - these two
requirements work against one another somewhat.
Cheers,
Pete.
--
Peter Batty - President, Spatial Networking
W: +1 303 339 0957 M: +1 720 346 3954
Blog: http://geothought.blogspot.com
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