From:	J Gavigan <csc086@*****.LANCS.AC.UK>
Subject:	Re: Computers and MP
Date:	Wed, 13 Apr 1994 08:03:19 +0100

> > Video Link
> > 6Mp will record 1 minute of low-resolution video (probably figure
> > that is is of the quality you'd see on the nightly news)
> >
> Any respectable (i.e., better than a college station) nightly news
> broadcast using NTSC video (the U.S. standard) will be what's now
> considered "normal resolution," 400 to 1000 scan lines (your VHS machine
> records 250-350 lines, while my professional SVHS camcorder records
> 450-500 lines.) Now, these lines are _not_ exactly equivalent to computer
> monitor resolution; I'm not sure about the technical explanation.

Is anyone? :)
Could we say that Digital Betacam is about 800-900 lines, then?

> In my educated opinion, low-resolution video, even in 2054, would
> be around 500 scan lines. Since it takes up so much less space than
> high-rez video, its probably at only 10 or 15 frames per second, as
> opposed to the modern standard of 30 fps.

No reason for it not to go at 30 fps, in my opinion...
Or at 900 lines, either, but anyway.
Here are a few calculations of mine:

Quote from some magazine that I wrote down:
A single uncompressed 24 bit image 240*180 pixels consumes 130k

That's at present, with noral rates of this and that, etc.

Ok, so 240x180 is about a quarter of a 15 inch screen.

130 x 4 = 520 kilobytes for one frame.
30 fps => 520 x 30 = 15.6 Meg.

Up the resolution a bit, and we're probably talking about
20 - 30 Meg for one second's worth of video.


Go to high-quality video, and I reckon it could be in the region of
50-60Meg. Perhaps even as high as a hundred.

*shrug*

I dunno - I think one thing we need to remember is the capacity of
optical chips, that can be written and erased with a flash of light -
pretty fast access, if you think about it.

Pesonally, I think that a Mp is probably over 200 Meg.

*shrug*
Jackin' out...

Dodger