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From: Doug Hortvet
Subject: Re: Digital Video
Date: Tue, 12 Nov 2002 08:09:54 -0600
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Thanks for your reply - however it appears I did not describe what I
want to do completely.
My goal is to use a single board CCD that outputs NTSC, encode /
compress the output data stream to an avi or mpg video file, store in
some variety of RAM, then download to my PC after the rocket is
recovered for viewing.
I understand Intel had manufactured such a device - their Digital
Movie Creator, which is now out of production.
It downloaded via USB, which my PC cannot accept.
I was hoping already existing components would be available to perform
the encoding and control the storage of data.
If not - building from scratch would be fun - I just have no idea
where to start.
Thanks again to everyone for their helpful comments.
Now that I have better explained the desired results - any guidance /
comments are greatly appreciated.
On Mon, 04 Nov 2002 20:12:26 -0500, Dan Barlow
>Douglas R. Hortvet, Jr. wrote:
>> 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.
>> Thanks for your comments - any more are greatly appreciated.
>How about this... optically combine several fast frames into each
>video frame by illuminating your rocket with a fast strobe lamp.
>It is easy to get strobe lamps into several 100s of Hz or a KHz
>and you will just get multiple exposures. You can try this with
>an ordinary film camera set in the "B" position, kill all lights
>and shoot at night with just the strobe. Use 3M driveway marker
>tape to get a bright spot on the rocket. We used this for physics
>experiments with pretty reproducible results. The other approach
>is to put a 5KHz blinky LED in the nosecone. Easy to do with a
>CMOS 555 timer, 3 resistors, 2 capacitors and a 3V lithium coin cell.
>Use a high brightness blue LED and it will stand out against the
>exhaust flare pretty well... or use a blue filter in addition.
>Mount 4 around the cone so you can see them as it rotates...
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