[AG-TECH] Quality of video in vic from Videum boards

[Lawrence A. Rowe]

"Osland, CD (Chris)" wrote:
> ...
> Bit puzzled by your comment about S-Video (aka Y-C) signal being
> expected through a BNC connector: Y-C refers to the two components
> (Y (luminance) and C (chrominance)) and so requires four pins
> (three at a pinch, but I've never seen the grounds being shared).
> ... 
>  Personally I've never had the time
> to set up a side-by-side comparison of the results of using
> composite versus Y-C as the source of a video conference feed,
> but both signals have so much more bandwidth than VC that I have
> used whichever is more convenient, plug-and-socketwise, in VC
> situations.
> 
---

We did this one time in our AG node because we typically left the camera
pointing at a sign with the UC Berkeley logo.  The compressed image had a funny
flicker with shades of green on a part of the image with high frequency
information.  One of my students guessed that it was probably the composite
signal, so we hooked up an s-video connection to the capture board and did a
side-by-side comparison.  The s-video signal was dramatically better.  So much
so that I would recommend that everyone use s-video if your camera has the
output and your capture card has the input.
	Larry
-- 
Lawrence A. Rowe (Emeritus Professor, UC Berkeley)
925-218-2221  http://cs.berkeley.edu/~larry