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Posted by Jan Panteltje on 12/25/06 14:30
On a sunny day (Mon, 25 Dec 2006 05:20:24 -0800) it happened "Richard Crowley"
<rcrowley@xpr7t.net> wrote in <12ovk0ro9e4dr7c@corp.supernews.com>:
>"Brian Huether" < wrote ...
>
>> Most instructional videos I have seen show a waste up shot that shows
>> enough detail of the player going through the exercises.
>
>And how effective is that? At that distance your fingers are
>only a few pixels high. I wouldn't find that very helpful.
>Might as well distribut an audio CD and some nice printed
>close-ups.
>
>>Then again I haven't seen many recently. I would only do the digital
>>zoom if there was enough resolution (i.e. if a normal DVD is 600x800
>>(just as an example) and the camera is capturing 1200x1600 then I would
>>feel pretty good about zooming).
>
>Video resolution is frozen at 720x480. This is the same
>for every video camera in NTSC-land (720x586 in the
>PAL-territories).
Richard, I have a cheap Mustek mpeg4 one, that records on SD card,
and I just tested that.
It does 640x480 @ 30fps (or 25fps), and has digital zoom.
The sensor itself is 3M pixels (2048 x 1536).
For the same lens setting, and all digital zoom settings, the image
is always calculated down to 640x480.
This means if I zoom in digitally, then I will indeed pass a point
where I am using only a 640 pixels wide part of the sensor :-)
Digital zoom simply uses only a smaller area of the image sensor,
and recalculates it to required the output format.
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