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From: nather@utastro.UUCP (Ed Nather)
Newsgroups: net.graphics
Subject: Re: Difference between Computer Graphics and Image Processing
Message-ID: <362@utastro.UUCP>
Date: Tue, 16-Jul-85 10:50:08 EDT
Article-I.D.: utastro.362
Posted: Tue Jul 16 10:50:08 1985
Date-Received: Thu, 18-Jul-85 08:24:18 EDT
References: <305@ur-laser.uucp> <823@turtlevax.UUCP> <113@usna.UUCP>
Organization: U. Texas, Astronomy, Austin, TX
Lines: 33

> I prefer the quote made by Dr. Azriel Rosenfeld a few years ago on the
> topic of computer graphics/processing/imaging:
> 
> The world can be broken into four pieces;  the first has nothing to
> do with images.  The second is generally called computer graphics
> and deals with generating visible images from numbers (display a line
> drawn from 0,0 to 1,1).  The third, image processing, deals with
> generating an image from another image, generally with certain
> enhancements.  The fourth, computer vision, deals with generating
> numbers from images (reading the numbers from bank checks).
> 
> So, we get:
> 1.	numbers -> computer -> image	(show me the line)
> 2.	image   -> computer -> image	(anti-alias this image)
> 3.	image   -> computer -> numbers	(what was that check number?)
> 
> For the net.graphics group, I think enough overlap in various areas
> exist that a good number of the people will be subscribing to all
> sub-groups.
> 	Terry Slattery	  U.S. Naval Academy	301-267-4413

Well, this categorization totally misses the operations astronomers refer
to as image processing, where we are concerned with extracting quantitative
values from digital images -- values which represent, in some way, the
physics involved in the processes the images represent.  I suspect other
disciplines do similar, but different, things.  I find the proposed
categories too limited to be of much value.

-- 
Ed Nather
Astronomy Dept, U of Texas @ Austin
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