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RE: Checkpoint 2.3 Avoid causing the screen to flicker - Test?

From: Gregg Vanderheiden <GV@TRACE.WISC.EDU>
Date: Sun, 07 Jul 2002 21:36:32 -0500
To: gian@stanleymilford.com.au, graham_oliver@yahoo.com, w3c-wai-gl@w3.org
Message-id: <002501c22628$461c91e0$066fa8c0@laptop600>

I'm not sure I follow.  Strobes are great for freezing (visually) and
measuring the period of something which is moving repetitively, but I
don't know how you use a strobe to measure a strobe.  I can sort of see
how you might, but don't see how it could be more effective or easier
than just using a light probe and looking at the events on an
oscilloscope (storage).   (or, for that matter, just capturing the
information using a computer as a storage oscilloscope.)

I don't recall anyone talking to me about using a strobe to measure
flash frequency.  But Trace is looking into the idea of a measurement
tool to address photosensitive epilepsy.   Have made progress and
contacts but don't yet have any determination of do-ability,
effectiveness, or timeline. 

More when I know more.

Gregg

------------------------------------
Gregg Vanderheiden Ph.D.
Ind Engr - Biomed - Trace,  Univ of Wis
gv@trace.wisc.edu

 


> -----Original Message-----
> From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On
Behalf
> Of gian@stanleymilford.com.au
> Sent: Sunday, July 07, 2002 6:41 PM
> To: graham_oliver@yahoo.com; w3c-wai-gl@w3.org
> Subject: RE: Checkpoint 2.3 Avoid causing the screen to flicker -
Test?
> 
> Graham,
> 
> We have discussed this briefly, and one of the problems is strobing
due
> to faulty/older monitors. You would need to decide on one
version/brand
> computer to use in the test. Unfortunately you can't test for
> everything!
> 
> Having said that, I still think it is a good idea, and I seem to
recall
> Geoff trying to get TRACE in on this.
> 
> Cheers,
> Gian
> 
> > -----Original Message-----
> > From: graham.oliver [mailto:graham_oliver@yahoo.com]
> > Sent: Thursday, 27 June 2002 9:12 PM
> > To: w3c-wai-gl
> > Subject: Checkpoint 2.3 Avoid causing the screen to flicker - Test?
> >
> >
> >
> > Er this could be daft (and may reflect the fact that I
> > have been out of the loop for a while) but couldn't
> > you use a stroboscope, to test the frequency of
> > flicker or flash?
> >
> > Cheers
> > Graham
> >
> >
> >
> > =====
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Received on Sunday, 7 July 2002 22:36:35 GMT

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