Subject: Re: Digital Video
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Date: Tue, 29 Oct 2002 08:19:41 -0000
NNTP-Posting-Date: Tue, 29 Oct 2002 08:19:59 GMT
Organization: ntl Cablemodem News Service
> > 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
> 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 you
> at 9.6Gbits/s (for 5000 fps) ... yikes ..!!!
> For 320x240 resolution ... that's 3 Gbits/s.
and I doubt that you would get a CCD with a fast enough shift register to
take input at that speed. Assuming you got the rest sorted you would end up
with 5000 pictures per second containing 50 different pictures only.