<div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div>I once improvised a fish-eye lens with an old dv camera and a glass ball:</div><div><a href="http://dl.dropbox.com/u/19070857/fisheye_.flv">http://dl.dropbox.com/u/19070857/fisheye_.flv</a></div>
<div>For some other shots, I used a video effect in kdenlive to compensate for the lens distortion:</div><div><a href="http://dl.dropbox.com/u/19070857/eric-tim-wiel.flv">http://dl.dropbox.com/u/19070857/eric-tim-wiel.flv</a></div>
<div>(the flv's should be playable with vlc...)</div><div>gr,</div><div>Tim</div></div><div><br><div class="gmail_quote">2011/5/23 Mathieu Bouchard <span dir="ltr"><<a href="mailto:matju@artengine.ca" target="_blank">matju@artengine.ca</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>On Mon, 23 May 2011, ronni montoya wrote:<br>
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<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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 ?<br>
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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.<br>
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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.<br>
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