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From: lamaster@pioneer.UUCP
Newsgroups: comp.graphics
Subject: effective resolution and anti-aliasing
Message-ID: <1713@ames.UUCP>
Date: Mon, 8-Jun-87 16:41:00 EDT
Article-I.D.: ames.1713
Posted: Mon Jun  8 16:41:00 1987
Date-Received: Wed, 10-Jun-87 07:30:22 EDT
Sender: usenet@ames.UUCP
Reply-To: lamaster@pioneer.arc.nasa.gov (Hugh LaMaster)
Organization: NASA Ames Research Center, Moffett Field, Calif.
Lines: 23
Keywords: resolution, anti-aliasing

I have heard that it is possible to represent lines of less than 1 pixel in
width with greyscale or color images using data filtered from a higher
resolution image or object.  I have never seen either the algorithms or the
theoretical basis for an algorithm.  [An example would be a representation,
using a greyscale picture, of a line less than one pixel or dot width in size].
I have looked in standard graphics textbooks and find no mention of this [but
I could have missed something or not understood what I was looking at].  Does
anyone know of any references for this?  Are there any devices out there which
make use of it [e.g. a monitor with a much higher resolution frame buffer than
the tube and a filter to reduce the resolution before output to the tube]?



  Hugh LaMaster, m/s 233-9,  UUCP {seismo,topaz,lll-crg,ucbvax}!
  NASA Ames Research Center                ames!pioneer!lamaster
  Moffett Field, CA 94035    ARPA lamaster@ames-pioneer.arpa
  Phone:  (415)694-6117      ARPA lamaster@pioneer.arc.nasa.gov

"In order to promise genuine progress, the acronym RISC should stand 
for REGULAR (not reduced) instruction set computer." - Wirth

("Any opinions expressed herein are solely the responsibility of the
author and do not represent the opinions of NASA or the U.S. Government")