[PD] 4 cameras for tracking people in a space

tim vets timvets at gmail.com
Tue May 24 00:01:11 CEST 2011

I once improvised a fish-eye lens with an old dv camera and a glass ball:
For some other shots, I used a video effect in kdenlive to compensate for
the lens distortion:
(the flv's should be playable with vlc...)

2011/5/23 Mathieu Bouchard <matju at artengine.ca>

> On Mon, 23 May 2011, ronni montoya wrote:
>  The thing is that i went to a conference where a guy explained he used 4
>> cameras to track people in a space instead of just one and you dont need to
>> have a high roof . I would like to know if somebody know this technique for
>> tracking people in spaces with 4 cameras ?
> That's interesting, because I also have used 4 cameras to track people in a
> space. It was a long room in which at the middle of the long walls I put two
> cameras per wall, pointing diagonally towards a car mirror such that each
> camera would see nearly one half of the space. I used those mirrors to
> increase the field of view from the standard 53⁰-by-41⁰ to something like
> 83⁰ wide, which is still not enough, but a big improvement.
> You could also use a single mirror and a single camera, if it has enough
> resolution... but then your mirror will be heavily curved, which means that
> you wouldn't be able to do the kind of mathematical shortcuts one can take
> when the mirrors aren't very curvy. And then you have a hole in the middle
> in which the camera sees itself.
>  _______________________________________________________________________
> | Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal, QC
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