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Home: Video University Forums: Tech Q & A:
Inexpensive Adjustment of Composite Video?

 

 


GeoTech
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Apr 13, 2006, 11:09 AM

Post #1 of 3 (758 views)
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Inexpensive Adjustment of Composite Video? Can't Post

We have an older scanning electron microscope that provides a composite video output for screen captures and we'd like to tweak the signal a little before it goes into the video capture device (an older Canon Snappy) on the computer. If the video image is adjusted for a good image on the SEM screen, the image going to the Snappy is washed out. I found that I could attenuate the signal with a 24ohm resistor on the line but that seems to introduce or make several horizontal bars faintly visible in the image. As a temporary solution I've been giving some thought to picking up an old Radio Shack video processor on ebay to try. I'm evaluating installion of a video capture card in the computer along with software that willl allow editing the image properties but it has to be simple to use. Any suggestions would be greatly appreciated.


Stoney
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Apr 13, 2006, 11:27 AM

Post #2 of 3 (757 views)
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Re: [GeoTech] Inexpensive Adjustment of Composite Video? [In reply to] Can't Post

Well to adjust the signal you need a TBC (time base corrector). This is simliar to the Radio Shack processor that you are looking at on eBay. Since the video is washed out, you will need something that will allow you to bring the video levels down. You also may need to put something like the resister in line as well.
As for editing software, Win XP has built in Moviemaker2 that is very easy to use, but also very easy to outgrow. I would recommend something like Adobe Premiere Elements, for example, because it will give you more control over the video, like being able to adjust colors, cropping and things like that. Then all you need is a firewire card and then an analog to digital converter, like the Canopus ADVC-110. Remember that DV video takes up approx. 13 gigs per hour, so make sure you have enough harddrive space.
There are many different ways to go, these are just some suggestions. Most editing programs have free demos for evaluation, that is the best way to see what works for you. As for pricing and ordering the equipment, just click on the B&H link above. They have great service and usually the best prices.

Cheers,
Stoney
LE 6.1, DVC-80, GL-1 & TRV900


wilebill
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Apr 13, 2006, 2:13 PM

Post #3 of 3 (750 views)
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Re: [Stoney] Inexpensive Adjustment of Composite Video? [In reply to] Can't Post

I'm thinking that the Snappy or computer is not terminating the signal properly. What may be a better bet, and way cheaper, is to get a T or splitter of some sort, put a 75 ohm terminator on one side of the T and run the other side into the Snappy.

If it is improper termination, a TBC won't fix that. If you have the manual for the old imager, see if it says anything about termination. Older devices and most higer-end equipment usually aren't self-terminating.

Regards,
Billy Horton
Video Image Productions

Studio & On-Location Video Production
2 NewTek VT[4.6] Editing Suites