Article View: sci.electronics
Article #15267Re: imaging system
From: Henry Spencer
Date: Sat, 21 Nov 1992 22:54
Date: Sat, 21 Nov 1992 22:54
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In article <8685@lee.SEAS.UCLA.EDU> annette@boole.seas.ucla.edu (Annette K. Nasif) writes:
>... I would like
>to have a videocamera, but the people working on telemetry say that it would
>be too difficult to transmit back that much information. I therefore need
>to find some sort of camera, the lighter and smaller the better, that can
>take a series of snap shots (at least 8 bit resolution) which can then
>be transmitted and received on the ground...
Ask around the local ham-radio community for people doing slow-scan TV work
(the abbreviation is SSTV).
Bear in mind that there's no magic way of cutting down the amount of data
in an image. Even at not-particularly-high resolution, say 300x300, you
are still talking about transmitting hundreds of thousands of bits per image.
Even if you spend several seconds transmitting each image, that's still a
fairly high data rate as radio transmission goes. Just how much data *can*
your telemetry people handle? If they can't give you at least 100Kb/s or
so, I think you're out of luck.
You might also want to check the Frequently-Asked-Questions list in
rec.models.rockets; people have done this kind of thing before.
--
MS-DOS is the OS/360 of the 1980s. | Henry Spencer @ U of Toronto Zoology
-Hal W. Hardenbergh (1985)| henry@zoo.toronto.edu utzoo!henry
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!torn!utzoo!henry From: henry@zoo.toronto.edu (Henry Spencer) Subject: Re: imaging system Message-ID: <By38y6.BIu@zoo.toronto.edu> Date: Sat, 21 Nov 1992 22:54:04 GMT References: <8685@lee.SEAS.UCLA.EDU> Organization: U of Toronto Zoology Lines: 24