On 12:54 Tue 15 Apr 2008, Colenbrander, Roderick wrote:
> First of all not much webcams offer high resolutions. Logitech has a
> bunch of those (e.g. QPC 9000 Pro / Sphere AF) and most others I found
> from Trust, Hercules seem to use the Microdia chipset which doesn't
> have an opensource driver yet. Does someone have other suggestions for
> webcams that offer good image quality and if possible a high
> resolution?
I can't make any specific recommendations but the Logitech cameras seem
to perform well.
> Another issue is of course that I'm limited to USB 1.1. I don't think
> the bandwidth is much of a problem as I don't need much images and
> don't need them frequently either. Second jpeg compression is fine by
> me (but I would like to be able to adjust the compression parameters).
> Does USB 1.1 somehow limit the resolution of the pictures I can take?
> I can imagine that the buffer size is smaller than the max image it
> can take and that USB2 is fast enough to empty it before data gets
> overwritten.
All of the Logitech cameras I own can do up to 800x600 on USB 1.1. You
probably won't do much better than that without going to a Hi-Speed bus.
It could be possible to get a higher resolution on 1.1 by using the
STILL_IMAGE_FRAME mode of UVC depending on the camera you use but that
isn't implemented in the Linux UVC driver yet. If you want to implement
it that would be great :)
Cheers,
Brandon
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