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I am trying to control exposure value for USB webcam connected to raspberry pi. Exposure is not listed in --list-controls for my camera, however exposure control was previously done for windows desktop by:

CamControl.Set(CamControlProperty.Exposure, ManualExposure, CameraControlFlags.Manual);

Is there any python libraries(similar to picamera) which may help me with that or other way to control exposure? Thanks.

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  • Did the manufacturer provide a windows driver? If so then that's what provides the additional functionality there.
    – goldilocks
    May 25, 2015 at 8:15
  • @goldilocks, thanks for reply. I am not sure what you mean, but the same camera has been used as sensor for windows desktop app(standard usb webcam driver and directshowlib allow to access exposure and autofocus controls). I am not familiar with Linux and its libraries to implement this functionality. Now I am trying to access these controls using OpenCV on Raspberry Pi.
    – Roman
    May 25, 2015 at 20:35

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Solved by using uvcdynctrl control tool instead of v4l2. For my webcam exposure can be changed by uvcdynctrl -s "Exposure (Absolute)".

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