Camera settings and configuration with OpenCV

[megasoft]

Is there a programmatic way to control camera settings? Assuming OpenCV needs to use one of the RaspiCam drivers (the official V4L or unofficial user space driver), how can I change the white balance for example?

Thanks

[megasoft]

Ok, I found here: http://www.linux-projects.org/modules/s ... e&artid=14

That there is a config file at: /etc/uv4l/uv4l-raspicam.conf and I believe I can use the awb option.

Is there such a conf file for the official driver as well?

[6by9]

Is there such a conf file for the official driver as well?

No, as the correct way to set that sort of thing is via the V4L2 API and control V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE. Whether OpenCV provides suitable controls to set that is another question.

You can use v4l2-ctl from the command line instead

Code: Select all

v4l2-ctl --set-ctrl=auto_n_preset_white_balance=N

where N is 0 to 9 for the different modes (search http://hverkuil.home.xs4all.nl/spec/media.html for V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE and it lists them in order, starting with 0 being manual).
V4L2 caches all settings, so once the driver is loaded and you change the setting once, it should persist until the driver is unloaded or the device rebooted.

[megasoft]

Thanks a lot!