headtracker / mag lens / macro lens (linaccess at yokoy.de)

linaccess at yokoy.de linaccess at yokoy.de
Thu Sep 6 15:01:58 EDT 2007

Hello Yuan Chao,

a special pattern could be a way do stabelize the tracking and make it immun to not relevant movements. On the other hand it slows down the XO enormously, IMHO. Tacking the whole face is not at issue, I think. We have to do tests some day...



On Thu, 6 Sep 2007 17:42:32 +0800
"Yuan Chao" <yuanchao at gmail.com> wrote:

> On 9/5/07, linaccess at yokoy.de <linaccess at yokoy.de> wrote:
> Hi Yokoy,
> > tracking a little shiny point at the head and transform it into mousepointer movements. Here is the description:
> > http://www.olpcaustria.org/mediawiki/index.php/Headtracker
> I don't how much computation power needed to track a pattern. I
> remember that for some webcam drivers provide different image sizes.
> If the effort is small enough, maybe you can consider tracking a
> pattern instead of light points, or even more, the face position. A
> small sticker with the special pattern on head or glasses would be
> enough. Also too precise tracking would be painful once you need to
> hold the position still when not moving. One thought would be to act
> like a "trackpoint" on thinkpad computer: when moving within some
> threshold, the position holds; when move further, the positioning
> moves continuously till move back within the threshold. The further
> above the threshold, the faster the positioning moves.
> -- 
> Best regards,
> Yuan Chao


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