P3D Re: Monitors

[Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Sat, 3 Jan 1998
>From: wier@xxxxxxxxxxxxxxxxx (Bob Wier) asks:
>
>>(I said)
>>There are two types of *flat* relative to monitors. One is the physical
>>shape factor which is the ONLY thing being referred to by manufacturers.
>>What I measured for, was stereo flatness, a measure of consistent pixel
>>distribution. I quality checked each screen by freeviewing repeated
>>wallpaper patterns, which any computer already has available. Some stores
>>are a little touchy about going into the control panel to arrange for this
>>process, but most were willing to let me look.
>>
>
>Larry - What exactly did you look for - a consistent depth or maybe
>retinal rivalry? This is most interesting (especially since I'm considering
>a new monitor purchase...)
>

*****  Consistent depth pretty much sums it up. There shouldn't be any
retinal rivalry since this is all at 1:1. Any small graphic tiled to fill
the desktop area creates repeated patterns exactly like stereograms.
However, since they are all exactly alike down to each pixel, that is NO
PARALLAX,  they SHOULD appear perfectly flat in stereo. When they don't,
it's the relative palcement of the identical pixel arrangements that's at
fault, ie: dimensional image quality.

I generally look at the patterns in both parallel and crossed. Especially
crossed since I can keep crossing to the next convergence point and compare
more distant portions of the screen. First level is immediately adjacent
patterns, next level combines from twice the original distance, the third is
three times as separated, etc. In parallel I can do 2 to 3 levels depending
on the pattern. In crossed, I can take it all the way to fusing the two
outermost columns of patterns.

The typical parallel view is a bulge outwards towards you, mostly in the
center. In crossed mode that becomes a bowl.

Tilt your head at 90 degrees and do the same process for vertical
accuracy... :-)

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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