Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site utastro.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!qantel!dual!mordor!ut-sally!utastro!nather 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 {allegra,ihnp4}!{noao,ut-sally}!utastro!nather nather%utastro.UTEXAS@ut-sally.ARPA