Path: utzoo!attcan!uunet!mcvax!unido!iraun1!iraul1!thschulz
From: thschulz@iraul1.ira.uka.de (Thomas Schulz)
Newsgroups: comp.ivideodisc
Subject: Re: DVI digital compression technique
Keywords: compression pyramid delta encoding fractal crunch
Message-ID: <743@iraun1.ira.uka.de>
Date: 18 Dec 88 15:05:24 GMT
References: <396@blake.acs.washington.edu>
Sender: news@iraun1.ira.uka.de
Reply-To: thschulz@iraul1.UUCP (Thomas Schulz)
Organization: Karlsruhe University, West-Germany
Lines: 27

Digital Video Interactive is a development done at General Electrics
David Sarnoff Research Center, now part of SRI.
On the 1987 Microsoft CD-ROM conference they demoed a prototype and announced
system development kits for the end of 1988.

DVI uses a compression method with asymmetricly balanced time cost. Compression
is done with a more time consuming algorithm - not in real time, and on transputers or other big machines (called DVI-centers). These compressed video data 
are put on a normal CD-ROM. On the user's side an expander-chip extracts
the video data from the CD-ROM in real time.
The main point is: DVI does real video (not only partial video as CD-I does)
 and DVI puts 75 min video on the CD-ROM.
Disadvantage: You need a chip set in your CD-ROM player, licenced from GE. This
is much like havind a Dolby-Chip in your cassette player.

DVI also has formats for video stills in various qualities.

Literature: 
Dixon et al.: DVI Video/Graphics. In: Computer Graphics World, July 1987.
Chaney: General Electric Digital Video Interactive Technology, Technical Background Information. David Sarnoff Research Center (1987?).
INTERactivities. (1)1, July 1987. David Sarnoff Research Center.

David Sarnoff Research Center, CN 5300, Princeton, NJ 08543-5300;
(609) 734-2211.

 
Tom Schulz
University of Karlsruhe.