[PD] infrared camera

B. Bogart ben at ekran.org
Sun Jul 23 08:38:58 CEST 2006


Do you have any documentation of the installation? Sounds interesting.

Note IR cameras do not see people, but the image from the projection
should not emit much (if any) IR light. So you need to project on a
surface (the floor) that absorbs IR light (so it looks black) and reflects
visible light. Then you just light the floor with IR lights (you may need
many many, and the people may not reflect much back...)

Note almost all CCD camera are actually sensative to IR light, they
sometimes have IR filters so that IR light (EG from remote controls) does
not show up in the image. So to make an "IR" camera, any CCD camera
(webcam works but could be very noisy) will work, you just need to add a
filter that passes IR light, but blocks visible light.

A black negative (fully exposed, processed film) will do the trick. Or it
may be an unexposed (black) slide film... I think the latter actually.

Anyhow that should help, there are some DIY projects online for converting
webcams to IR.

..b.


On Sun, July 23, 2006 1:25 am, yukio said:
>
> Hi, Do anybody have tried infrared cameras with pd/gem?
> i made an installation for public spaces. using a web cam i tracked the
> positions of people in a space(with pix_multiblob) then i send the
> resulting coordinates to a processing program that create a graphic
> representation of the people in a alife system, allowing people interact
> with the creatures. In the first version of the installation i projected
> the processing interface to a wall so people can see theirself in the
> projection and can modify their positions in the real space to control
> their visual representation.
>
> What i want to do now is to project the processing interface to the
> floor, so people can interact with the creatures in more direct way. The
> problem with this is that it generates a feedback , because if i project
> the interface in the same space that is being tracked , the system is
> gonna track the projected images (retroalimentation) and it doesnt work
> fine.
> A friend of mine recommended to use infrared cameras , because they just
> track the humans bodys and not the projections.
> do anybody have tried infrared cameras with pd/gem?
>
> which one do u recommend me? any hint?
>
>
> many thanx for  the answers
>
> yuk
> --
>   yukio
>   yukio_mishima at fastmail.fm
>
> --
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>
>
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