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From: bobr@zeus.UUCP (Robert Reed)
Newsgroups: net.graphics
Subject: Re: Possible way of anti-aliasing.
Message-ID: <566@zeus.UUCP>
Date: Thu, 18-Sep-86 15:15:02 EDT
Article-I.D.: zeus.566
Posted: Thu Sep 18 15:15:02 1986
Date-Received: Sat, 20-Sep-86 02:24:11 EDT
References: <280@joevax.UUCP>
Reply-To: bobr@zeus.UUCP (Robert Reed)
Organization: CAE Systems Division, Tektronix Inc., Beaverton OR
Lines: 21

> I have no idea whether or not any of this is valid.  I started thinking
> about anti-aliasing about 5 minutes ago, so this is just off the top of my
> head.  It seems to be a pretty brute force way of doing it, but swift.  If
> you only stack 3 lines at a time, it will be very memory efficient too.
> 	Steve Hawley

There are several techniques for doing spacial anti-aliasing, but the
essential algorithm is to oversample the image and then filter it down to
the resolution of your display device.  For example, if you do four samples
per pixel over a uniform grid and simply average the four values together (a
technique known as box filtering), you will get a crude form of
anti-aliasing.  Improvements can be made by varying the sampling and
filtering techniques (e.g. stochastic sampling, triagular and gaussian
filtering, etc.).  Check any contemporary computer graphics text or look
through recent publications from SIGGRAPH for more details.  

This newsgroup should not be a forum for naive speculation.  There is enough
solid information about the subject that it shouldn't be necessary to shoot
from the hip

Robert Reed, Tektronix CAE Systems Division, bobr@zeus.TEK