On Sun, May 26, 2013 at 09:34:50AM +0100, Sebastian Arcus wrote: > As far as I know, autofocus can be disabled on most usb web cams > that have it. At least under Linux. The Linux uvc development list > (http://www.ideasonboard.org/uvc/) is a really good place to get > more info. One word of warning about the MS LifeCam Studio and MS > LifeCam Cinema: they both seem to have an inbuilt bug/feature which > makes them request all available USB bandwidth, even if they don't > need it, even if they are set on low resolution, even if they work > in mjpeg. That makes using more than one of these cameras on the > same USB root hub impossible. Extra PCI or PCI-e usb cards would > solve this problem I believe - if one operates them from a desktop. > I think there is somewhere a PCI-e usb expansion card with 4 usb > root hubs (chips) on board - which would allow 4 extra cameras to be > connected.
I found another issue - "Rolling Shutter" - The normal CMOS USB Webcams do have rolling shutters. Looking out in the front is okay. Looking 90° left or right produces strange images for e.g. street lamps which seem to bend towards driving direction. So i am again puzzled on how to proceed. Using CCD industrial cameras would be an option. But high-res, high shutter speed, CCD cams are prohibitive expensive for a hobbiist when you need like 5-6 cameras to get a 360° view. So - CCD, Color, Global Shutter, FullHD, 30fps, Ethernet cameras on my wishlist :) Flo -- Florian Lohoff [email protected]
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