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From: "Hemon Dey"
References: <31B584DFA62E8C71.0C1CBE6796076916.B18AF75C14DFDAEF@lp.airnews.net> <8F00A252F2C14580.3F8FE61F79C4C579.70B0DA0307B8BFA6@lp.airnews.net>
Subject: Re: Digital Video
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Wed, 30 Oct 2002 09:48:24 +1300
NNTP-Posting-Date: Wed, 30 Oct 2002 09:48:21 NZDT
"Douglas R. Hortvet, Jr." wrote in message
> Thank you for your reply - as you perhaps could tell, I have little to
> no knowledge about how to proceed with such a project.
> The application I have for the digital video is a model rocket.
> A friend provided information via the following:
> Data rates in the GB/sec range would appear to be beyond what I want /
> need to do.
> Any specific recommendations on how to proceed - such as hardware to
> use and building instructions?
> One way would be to buy a digital cam corder and extract the internals
> - however, that may not be a very economical method.
> Thanks for your comments - any more are greatly appreciated.
> "Hemon Dey" wrote:
> >Hello Doug,
> >5000 frames/s seems like a very fast camera, your application must be
> >extremely quick if you want that sort of speed. I'm sure you know that TV
> >normally 25 frames/s. I doubt that you will find a kit to do what you
> >on doing, as I'm assuming you probably want 600x400 resolution (8 bit
> >for 256 colour)- which means high bandwidth data transfers to FIFOs and
> >RAM on board your rugged pack with a bus controller capable of operation
> >that speed, probably a DSP. Are you sure that 5000 fps is what you need?
> >Simple calculation will give 1.92Mbits per frame, and that's coming at
> >at 9.6Gbits/s (for 5000 fps) ... yikes ..!!!
> >For 320x240 resolution ... that's 3 Gbits/s.
> >"Doug Hortvet" wrote in message
> >> I want to build a digital video system that will be able to store the
> >> output of a small CCD and download to a PC at a later time.
> >> The system must be light, rugged, battery powered, able to withstand
> >> shock and moderate G forces, and not too expensive.
> >> Would like to capture video data for a max. of ~15 sec. at a shutter
> >> speed of ~5,000 frames / sec.
> >> Audio would be nice, bit not essential.
> >> Are their kits or do-it-yourself instructions available - preferably
> >> on-line?
> >> Any and all assistance is greatly appreciated.
> >> Thanks in advance!
> >> Doug
It all boils down to what you want to do. Getting a digital camera will give
you 25 or 30 fps at a resolution of 720x576 (PAL) and something similar for
NTSC. I have a digital camera myself and I do video editing. Even at 25 fps
on progressive scan (which means every frame is not interlaced), you can get
highly defined video which you can slow down to frame by frame to watch your
rocket from start to end. Do you know how fast your rocket accelerates? do
you want to see the acceleration down to mm's, cm's, m's ??? What you want
dictates how hard this problem will be. The best thing to do is to borrow a
video camera (analog or digital), and somehow get the footage of your rocket
on to a computer where you can look at it frame by frame, I guess you can
even do it on your video player if it has that capability. If it is truly
hideous, then you're going to have to invest is a higher technology.
Some cameras also come with shutter speed adjustment, make sure the shutter
is on the highest setting so that your consequtive frames resemble better
the fast motions. Note that when using a high shutter speed, you should
increase the exposure or film in bright light as the overall brightness
I hope that helps.
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