T3D Re: acuity enhanced......display issues

[roberts@xxxxxxxxxxxxxxxxx (John W Roberts)]

>Date: Thu, 19 Mar 1998 11:49:24 -0700
>From: Jim Crowell <crowell@xxxxxxxxxxxxxxx>
>Subject: T3D Re: acuity enhanced......display issues

>At 8:53 AM -0800 3/19/98, Peter Abrahams wrote:
>>>From the article:
>>Sloan characters were displayed on a Mitsubishi color monitor driven by an
>>X-Windows (X-11) server residing on a Silicon Graphics IRIS 4D/25 graphic
>>workstation with a StereoGraphics Corporation stereo-display system.  The
>>final resolution of the display was 1280 horizontal x 512 vertical pixels,
>>and the luminance was 88.3 cd/m^2.  ....(low vert. from synced
>>shutters....monitor 120Hz..)The glasses provided an apparently flicker-free
>>60-Hz image to each eye, with 32% transmittance and negligible cross talk
>>(~1.1% transmittance through the closed shutter)

>Anyone want to guess at the phosphor persistence (i.e. how much it would be
>emitting 1/120th of a second after the gun swept by)....

Peter's notes from the article give many of the details of the experiment,
but other items are missing from the post (and presumably also from the
article), such as the exact model of Mitsubishi monitor used.

But if the decay weren't pretty close to complete after 1/120 second, the
image crosstalk wouldn't be "negligible".

Come to think of it, the math formula given seems to indicate the use of
dark characters on a light background (perhaps "Sloan characters" are
always like that - I wouldn't know), so under those circumstances the main
effect of phosphor decay time should be on perceived contrast of the
characters.

John R


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