calufrax@blake.acs.washington.edu (Chad Fogg) (12/17/88)
"CD-ROM Review" hasn't mentioned anything regarding DVI's method of digital compression. I believe I read in "Audio" magazine about a year ago that it involves non-real-time compression of each video frame, and that the method is known as "pyramid delta encoding." Does anyone know more details about DVI's scheme? C.Fogg calufrax@blake.acs.washington.edu
thschulz@iraul1.ira.uka.de (Thomas Schulz) (12/18/88)
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.
jejones@mcrware.UUCP (James Jones) (12/20/88)
Has anyone tried the DVI compression technique on, for example, an episode of Rowan and Martin's Laugh-In (which has segments with many fast cuts) or one of those "history of x in two minutes" sequences that one used to see back in the 70's, that displayed large numbers of images one after another, each on the screen barely long enough to recognize? James Jones
kdb@lts.UUCP (Kurt D. Baumann) (12/21/88)
It would probably work just fine. Except that you wouldn't save too much space. And at some point you would be just as well off with a normal Video disk. Does anyone out there have a set of the DVI boards? We have been trying to trying to get a set for the past year and have had no luck. We are on the mailing list, but that doesn't do us much good for creating anything.-- Kurt Baumann ...!uunet!lts!kdb / lts!kdb@uunet.uu.net InterCon, 11732 Bowman Green Drive, Reston, VA 22090 -- "?" -- Unknown