..on or around Sat, Dec 15, 2007 at 07:03:54PM +0100, Richard Atterer said: > > On Sat, Dec 15, 2007 at 03:32:35PM +0100, Julian Oliver wrote: > > are there any plans to expose this automatic light calibration as a param > > accessible to modprobe? i'd like very much to not have this automagical > > calibration at work at all times. > > This is already possible, although luvcview doesn't always behave > deterministically for me when doing it. > > In luvcview, I switch auto-exposure mode off (may require several random > clicks on Auto Exposure On/Off), then set the exposure to some high value > (300 seems to stand for 30 fps), then adjust the gain to get a light enough > picture. Unfortunately, the picture may still be too dark at maximum gain > (255), so you may also have to play with brightness and contrast. >
this is great, thanks: after several random clicks Auto Exposure is set to off. however, i don't seem to have much luck with changing the Exposure rate itself in luvcview. i get this error output: max 10000, min 1, step 1, default 166 ,current 81 ioctl set control error Set Absolute Exposure up error > For me, picture quality is good even with little light. With almost no > light, just what's coming from my 2 screens, I start to see some noise > (vertical blue/orange stripes), but the picture is still OK, if slightly > blurry. Compliments to Logitech/Zeiss!! :-) truly.. i'm working on a large computer vision project currently: this camera has better picture quality than some of the comparitively expensive firewire cameras i've played with (and at 960x720 it's quite a find). > > IMHO, it wouldn't hurt at all if the auto exposure mode were a bit less > conservative. It would also be convenient if you could specify a minimum as > well as a maximum framerate. agreed, this would be good.. > > BTW, changing controls is also possible with uvcdynctrl > <http://www.quickcamteam.net/software/libwebcam/> and v4l2ucp > <http://sourceforge.net/project/showfiles.php?group_id=146218>. i'll try uvcdynctrl now to see if this allows me to manipulate the capture rate. thanks again, -- http://julianoliver.com http://selectparks.net emails containing HTML will not be read. _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
