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Re: Is Quickcam still a good deal?
On Jul 14, 1:54pm, Russell Nelson wrote:
>
> This is NOT to dissuade you from doing that, but the problem I see
> with any video digitizer attached to a CCD camera is that you've got
>
> analog->digital->analog->digitized
> light ccd NTSC video
>
> multiple analog->digital conversions. Every time you do that you lose
> information and introduce distortion.
Shouldn't that be...
analog -> analog -> analog -> digital
light CCD NTSC video capture
The charge on each CCD cell after exposure is an analog value, a voltage
proportional to the light received [or is that inversely proportional?!]. These
values are then clocked out of the CCD array. In the QC they're then converted
to digital; in a traditional analog-video camera, they are clocked out between
the appropriate H and V sync signals and amplified to the required levels... no
A/D takes place (except that a smart camera will have A/D to give feedback to
the camera's CPU on brightness, etc).
--
Chris Tyler <Chris@Global.Proximity.ON.CA>
Global Proximity Corporation http://Global.Proximity.ON.CA/
Internet and Computer Consulting (519) 421-3541 / fax (519) 421-2107
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