T3D Re: acuity enhanced with binocular vision

[roberts@xxxxxxxxxxxxxxxxx (John W Roberts)]

>Date: Wed, 18 Mar 1998 10:57:07 -0700
>From: Jim Crowell <crowell@xxxxxxxxxxxxxxx>
>Subject: T3D Re: acuity enhanced with binocular vision

>>Note: There's no doubt that a test of this kind can measure with complete
>>accuracy the visual response to a Stereographics display system. The question
>>is how closely that will correlate to visual response for other display
>>systems, paper cards, real-world situations, etc.

>My guess is that these effects would be quite small compared to the range
>of inter-individual variability & the variations caused by the experimental
>manipulations.  

Could be. My initial guess would be that unless there was a really serious
error in the design of the experiment (unlikely), the trends reported are
almost certainly correct, and the numbers stated are probably correct to
within 50% or better (which is still pretty good). It's possible that
enough care was taken to make them even more accurate than that.

>The thing you'd really want to worry about would be that
>the display effects be equivalent between monocular & binocular conditions,
>i.e. what exactly did they do to create the monocular images (replace the
>target in one eye--e.g. on alternate frames--with a uniform background,
>maybe?), & could it have affected the display quality in those conditions
>relative to the binocular conditions...

Agree. One of the problems is that people who are not specifically involved
in display issues have a tendency to think of displays and display measurement
techniques as being "perfect". As a possible example, the reference includes
a comment on contrast levels of 30% - it's important to know whether that
level was set just by the RGB levels sent to the graphics controller, or
whether it was actually measured, and if so how the measurement was performed.

John R


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End of TECH-3D Digest 272
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