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

From: Gregg Vanderheiden <GV@TRACE.WISC.EDU>
Date: Thu, 11 Jul 2002 00:10:27 -0500
To: w3c-wai-gl@w3.org
Message-id: <004b01c22899$4540b0d0$066fa8c0@laptop600>
Wendy WROTE

 

> Could someone find out how much it costs and what exactly it does?

> --Wendy

 

 

Hi 

 

I checked it out.  It is from England.

 

I called the developers (several times actually) and discussed with
them.  It is really quite nice but quite expensive - and not really
designed for Web application.

 

 

The basic cost for a standard unit is $16000.00 CIF, duty and taxes not
paid.

 

It appears to be intended for use in broadcast or video industry.

 

The standard unit consists of: 

 

-a desk-top PC fitted with a data capture card and a firewire control
card, 15" LCD monitor and connecting cables.

 

-a printer and cables.

 

-a JVC D-VHS VCR and cables.

 

-The analysis Software.

 

The VCR model they are using is undergoing a model change and they would
need to check if either version is available in US NTSC version.

All tapes (or video signals) should include a section of colour bar or
pluge to enable calibration.

 

 

Am now talking with them about collaborating on the development of a web
version -- hopefully that could be available for use free.   Will let
you know. 

 

 

 

Gregg

 

------------------------------------

Gregg Vanderheiden Ph.D.

Ind Engr - Biomed - Trace,  Univ of Wis

gv@trace.wisc.edu

 

 

 

 


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> -----Original Message-----

> From: Wendy A Chisholm [mailto:wendy@w3.org]

> Sent: Wednesday, July 10, 2002 4:39 PM

> To: GV@TRACE.WISC.EDU; gian@stanleymilford.com.au;

> graham_oliver@yahoo.com; w3c-wai-gl@w3.org

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

> 

> I don't know about strobes, but as I reported in June [1] there is a
tool

> available. I still have not played with it. But info is available at
[2].

> 

> Could someone find out how much it costs and what exactly it does?

> --wendy

> 

> [1]
http://lists.w3.org/Archives/Public/w3c-wai-gl/2002AprJun/0395.html

> [2] http://www.hardingfpa.co.uk/

> 

> At 10:36 PM 7/7/02, Gregg Vanderheiden wrote:

> 

> >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

> > > >

> > > >

> > > >

> > > > =====

> > > > 'Making on-line information accessible'

> > > > Phone : +64 9 360 1265 - New Zealand

> > > >

> > > > __________________________________________________

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> > > >

> > > >

> 

> --

> wendy a chisholm

> world wide web consortium

> web accessibility initiative

> seattle, wa usa

> /--




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Received on Thursday, 11 July 2002 01:10:33 GMT

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