Hi Sebastian, On Friday 29 April 2011 21:17:07 Sebastian Arcus wrote: > On 04/29/2011 09:56 AM, Laurent Pinchart wrote: > > On Wednesday 27 April 2011 10:42:14 Paulo Assis wrote: > >>> 1. Would this be fairly specific to the Logitech QuickCam 9000, or is a > >>> more generic issue with webcam sensors? > >> > >> Neither, you just need to lower exposure time. > >> > >>> 2. Are other webcams better in this respect? > >> > >> I don't think so, you can control exposure quite easily with this cam. > >> > >>> 3. Can I use any of the UVC features to tweak the driver parameters in > >>> order to force sharper images of objects on the move? > >> > >> Yes, just set exposure mode to manual, and tweak exposure absolute, > >> also remember to disable "exposure, auto priority". > >> You should also use the highest fps possible (30 fps I think) > >> > >>> 4. Is this to do with the auto-focus of the camera, and can I turn it > >>> off or peg it in software at a certain value, to improve things? > >> > >> Yes, use uvcdynctrl (command line) or guvcview (gtk) (guvcview > >> --control_only will let you use your program along side it) > > > > As far as I know, auto-focus for the Logitech QuickCam Pro 9000 is > > implemented in software in the Windows driver. The camera has a manual > > focus control only. You can tune it with any V4L2 application that > > supports controls, such as uvcdynctrl, guvcview, v4l2-ctl, yavta, ... > > I've had a look and it indeed there is a focus control. Considering that > by default it is set on 0 (and it was set on 0 during operation), does > this mean that it is on auto?
No, the camera doesn't implement auto-focus. Which focus control does your camera report, absolute or relative focus ? -- Regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
