[oats-sig] Re: open gazer

Hi Tom

OK will have a go! Though it'll be next week before I get a chance
(complicated housing logistics of my life!).  

Cheers.

Simon

-----Original Message-----
From: oats-sig-bounces at lists.becta.org.uk
[mailto:oats-sig-bounces at lists.becta.org.uk] On Behalf Of stephen emslie
Sent: Wednesday, October 03, 2007 11:31 PM
To: OATs Project Special Interest Group
Subject: Re: [oats-sig] Re: open gazer

Hi

It turns out the opengazer readme has been updated with answers to most of
the questions that I encountered, so rather than repeat what has been
written there I'll just point you on to the homepage [1] and the readme [2]

[1] http://www.inference.phy.cam.ac.uk/opengazer/
[2] http://www.inference.phy.cam.ac.uk/opengazer/README

I can confirm that the apt-get installation of libcv-dev and all that does
work on ubuntu.

I found installing vxl a bit tricky as I am not familiar with cmake, but the
vxl page does a good job of expaining it:
http://vxl.sourceforge.net/releases/install-release.html

Just make sure to set BUILD_SHARED_LIBS to ON. I also changed
CMAKE_INSTALL_PREFIX on my system to /usr as I think it was /usr/local which
ubuntu doesn't include in its search for shared libraries.

also, I had trouble with the latest release, so perhaps use vxl-1.8.0 till
you have things working.

I also found the Makefile quite fiddly in opengazer 0.1.1, but that seems to
have been improved in 1.1.2. The only thing I had to do was change the
VXLDIR to reflect that '/usr' prefix on my system (it is set to /opt by
default).

The rest is described well in the makefile. I imagine there will probably be
some hackery about the webcam. I found that I definitely needed the

"sudo modprobe pwc size=vga"

line before anything would work for me. One more catch I'm afraid.
Ubuntu 2.6.20-16 seems to have removed the pwc driver, rather unhelpfully
(it wouldn't even build under ubuntu!). If you're using a camera that
requires this driver than roll back to 2.6.20-15 like me.
I think the next webcam I buy will have to be supported by UVC or SPCA5XX or
something else that actually works in ubuntu. I'll have to investigate the
driver issue more thoroughly.

I hope that helps a bit. Please respond with any problems you have and
perhaps we can figure them out. Personally, I'm learning a lot of this as I
go along so I welcome any feedback from more experienced linux hackers.

Good luck!

Stephen

On 10/3/07, stephen emslie <stephenemslie at gmail.com> wrote:
> Hi Tom
>
> Thanks for the offer of help on Windows. I'm sure that platform will 
> be a barrel of fun, so probably the first thing to investigate is 
> whether we can get opengazer built and running. I _think_ that most of 
> the dependencies can be built on windows, but perhaps we should see 
> what the author has to say.
>
> Stephen Emslie
>
> On 10/2/07, Tom Nabarro <whizz2000 at hotmail.com> wrote:
> >
> >  511"
> > The next step is to start interpreting the calculated gaze positions 
> > into a switch activation. opengazer outputs everything to a port as 
> > it works, which should make things a bit easier. Any suggestions on 
> > good assistive software I can play around with? I hear there's this 
> > great "Jambu" thing... :)
> >
> > "
> >
> > in response to this from Stephen, if you need anything done on 
> > Windows I could write a socket application to listen for that port and
then interpret
> > the gaze positions     to detect for switch activationbased on the
threshold
> > method at first.  I might have the wrong end of the stick, but if 
> > any of this sounds useful let me know.
> >
> > ________________________________
> > Get free emoticon packs and customisation from Windows Live. Pimp My
Live!
>

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