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From: smart@manta.mel.dit.csiro.au (Robert Smart)
Newsgroups: comp.compression
Subject: beginners question on video compression
Message-ID: <1991Jun6.090813.3584@mel.dit.csiro.au>
Date: 6 Jun 91 09:08:13 GMT
Article-I.D.: mel.1991Jun6.090813.3584
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Apple's recent announcement described compression rates for video of
5-25:1. I'm surprised you can't do better. I'd like to understand
the problem better:

1. What is the typical form of uncompressed video data? E.g. is it a 
   series of rectangular arrays of rgb triplets with each colour in
   the range 0-255?

2. What sort of rates of edge movement do you see in video data: 2 pixels
   per frame; 1 pixel every 2 frames; or what? I realise this varies a
   lot but I'm thinking of an average TV program.

3. Is there any example video data in digitized form one can easily
   obtain (e.g. by ftp)?

Bob Smart <smart@mel.dit.csiro.au>