🚀 go-pugleaf

phantom@casbah.acns.nwu.edu (James Choi) writes:


>I have an application where I have to store a "live" image as it is
>digitized 30 time a second.  The image size is 512x512, 8 bits per pixel.
>This translates to close to 8M/sec data transfer.  Can this be done?

Get a computer with a real BUS architecture.  Like a UNIX workstation(SUN,SGI..)
with some decent power, memory, and a fast bus arch and a fast scsi-2 disk
subsystem.

A ISA bus won't do it.  A EISA bus will theoretically do it, I've never tried.
A LB system will.  Note:  you must get a fast-scsi-2 adapter and a fast-scsi-2
device to even have a chance.  There are I believe a couple of higher-end
controllers which work with IPI and perhaps wide-scsi(20MB/s), but I don't think
they are economically feasible.

I don't know what level of quality you are looking for, but there are JPEG
compression cards available.

>If not, how much do I lose by storing an image on a video tape, and then
>digitizing it on its play back?  Did anyone do any research on this topic?

Depends on what sort of video tape.  Professional 1" or 3/4" will record that
with no real degradation.  std VHS and 8mm are near  useless in terms of 
detail work.  S-VHS is okay.  I prefer sony HI-8.  The resolution we get is
640x480 and very realistic color depth.  The Hi-8 has better quality than the
S-VHS IMHO.

BTW--I do image processing on a SUN and Multimedia on a Quadra 950 and a 486
DX33 LB EISA machine. 

--
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Systems Administrator   \ 803)-792-4969 (W)  \ miracles, don't belong in the
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Integrated Technical Systems\ lam@jove.cofc.edu  \ "Of course it works!" 
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