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[photo-3d] 3-Digital


  • From: Monte Ramstad <mramstad@xxxxxxxxxx>
  • Subject: [photo-3d] 3-Digital
  • Date: Sat, 14 Apr 2001 09:02:59 -0500

Some interesting numbers ideed!

A typical monitor has about 4 lines per millimeter.  Therefore,
if viewed from 10 inches, it won't look sharp.  In order to get
the equivalent of about 8 lines per millimeter, a 19" monitor
should be viewed from about 24" as Gabriel points out.

This has important implications for designing a viewing aid for
computer screens.  If you value sharpness more than
field-of-view you should use a viewer with a focal length around
24" or infinity.  If you value field-of-view more than sharpness,
you should use a viewer with a short focal length (which will
also magnify).

So the question is: which is more important for viewing stereo
images sharpness or field-of-view?  People's opinions are
bound to differ, but for me sharpness is more important.
Without a sharp view, it seems to me that the stereo effect
is greatly diminished.  This is one of the issues which lead
me to design the the PokeScope viewer.  I figured that
people should at least have an option to choose sharpness
when viewing stereo images on a computer.

Dr. Monte Ramstad
www.pokecope.com

Gabriel wrote:

> numerous studies
> indicate that the eye judges an image looks sharp when it has about
> 8 lines per mm, viewed from a distance of roughly 10 inches away
> (granted there are other variables that make slides look more
> realistic). Higher than 8l/mm, the eye would have a difficult time
> resolving. This is roughly what a 4x6" 200dpi resolution image
> (or 1600x1200 pixel image at ~24 inches) represents.
>




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