Disable Webcam's Autofocus In Linux
Solution 1:
Use program v4l2-ctl
from your shell to control hardware settings on your webcam. To turn off autofocus just do:
v4l2-ctl -c focus_auto=0
You can list all possible controls with:
v4l2-ctl -l
The commands default to your first Video4Linux device, i.e. /dev/video0
. If you got more than one webcam plugged in, use -d
switch to select your target device.
Installing v4l-utils
Easiest way to install the utility is using your package manager, e.g. on Ubuntu or other Debian-based systems try:
apt-get install v4l-utils
or on Fedora, CentOS and other RPM-based distros use:
yum install v4l-utils
Solution 2:
You can also do it in Linux with:
cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_AUTOFOCUS, 0)
For some people this doesn't work in Windows (see Disable webcam's autofocus in Windows using opencv-python). In my system it does (ubuntu 14.04, V4L 2.0.2, opencv 3.4.3 ,logitech c922).
Solution 3:
In case anyone finds is useful, I've come up with a small snippet that can be added to your .bashrc
. It will detect which of your webcams have autofocus and then disable it.
Prerequisite: v4l-utils
# Get a space-separated list of all the video devices available
webcams=$(ls -pd /dev/* | grep video | tr'\n'' ')
for webcam in$webcams; do# Check if the tested video device features autofocus
no_autofocus=$(v4l2-ctl --device=$webcam --all | grep focus)
# If it does, disable itif [ -n "${no_autofocus}" ];
then
v4l2-ctl --device=$webcam --set-ctrl=focus_auto=0
fidone
This snippet does certain assumptions:
- You want to disable autofocus on all the video devices featuring it
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