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Re: [pwc] Latency

To: <>
Subject: Re: [pwc] Latency
From: David Wennström <>
Date: Tue, 19 Jun 2007 14:56:49 +0200
Hello, and thanks for the quick reply,

From: Tommi Ilmonen

> Hi.
> 
> David Wennström kirjoitti:
> >
> > Hello,
> >
> >  
> >
> > Is there any way to reduce latency? (I am using the SPC900NC camera.)
> >
>
> If you have any budget at all I would recommend going for Firewire (raw 
> bayer output) cameras. For example the ones from the imaging source work 
> ok. You can get to 60 fps without too much trouble.
>

No, no real budget, I have however looked at these cameras before and if this 
project goes any further I would recommend better (faster) cameras - it is 
necessary!

> >  
> >
> > I am building a head tracker software (for my master's thesis) wants 
> > to reduce lag. I have measured the latency from picture taken in 
> > camera to user program to about 80 ms setting the fps = 30, shutter = 
> > 30000 and gain = 65000 parameters (I want a dark image filtering out 
> > light points).
> >
> >  
> >
>
> I assume you are doing the "classical" color blob detection + 3D 
> tracking(?) There are lots solutions out there, but I assume you want to 
> build your own system.

Yes, one of my objectives is to make it cheap and by using "normal" webcams. 
The real task is done - I have built a 6DOF sensor and it works, but (!) I want 
to make it faster. And these 80 ms are really nagging me.

I am also very interested in links and projects that I can read about 3D 
tracking system like this in general and particularly head tracking.

>
> -- 
> ====================================================
> Tommi Ilmonen
> Tel: +358-50-3841 543
> Ubiquitous Interaction Research Group
> Helsinki Institute for Information Technology 
> http://www.hiit.fi/ubiquitousinteraction/
> ====================================================

Best regards,
--David

>
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