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Okay. Two answers:
absolute_exposure
if you want to manually set the exposure to a fixed value, or change the exposure
parameter to an automatic exposure setting. You'll have to play around with dynamic reconfigure to find the appropriate value (but for my Logitech Webcam Pro 9000, the only auto exposure it supports is "3"). I can't say exactly for certain what your webcam supports, but you can also play around with it in guvcview
, which is a Linux tool that uses the same underlying driver interfacing (and so shares parameter constants).Eventually I'd like to update the driver (maybe once an "official" USB camera driver is underway or as part of that work) to work more like camera1394
, where it only changes out of the auto mode if you explicitly set the driver to use a manual value. I emphasize the eventually in there since I really need to write my M.S. thesis instead of work on a camera driver right now ;)
Hope that helps.