This lets you use a webcam to scan QR codes, and POSTs the scanned ids to the library server.

sudo apt-get install libzbar0 libjpeg8-dev python-dev libsdl-image1.2-dev libsdl-mixer1.2-dev libsdl-ttf2.0-dev libsdl1.2-dev libsmpeg-dev python-numpy subversion libportmidi-dev ffmpeg libswscale-dev libavformat-dev libavcodec-dev
pip install -r requirements.txt

python main.py <LIBRARY HOST>

We're using C920 webcams which have a very sensitive autofocus.

I recommend disabling autofocus:

v4l2-ctl -c focus_auto=0

Then manually setting the focus:

v4l2-ctl -c focus_absolute=20

For reference: v4l2-ctl -l

If your video device is one other than /dev/video0, use the -d flag to specify it.

We're running this off of Raspberry Pis.

When SSH'd into the Pi, to launch properly:

export DISPLAY=:0
python3 main.py

If you need to wake the Pi's screen:

export DISPLAY=:0
xset s reset

The Raspberry Pi's default DNS may be non-ideal, making API calls slow. To change the Pi's DNS servers, edit /etc/resolv.conf as root. Edit it to look like:

# Generated by resolvconf
nameserver 8.8.8.8
nameserver 8.8.4.4  

Alternately, run sudo ./setdns.sh, which will do the above.

NOTE: DNS will reset upon boot.

The file will try to read from pisettings.py. See pisettings.py.example for an example of what it looks like.

If pisettings.py exists, it will read from pisettings["rotateangle"] and rotate the screen correspondingly.

This is so that each checkout station can have its video feed rotated to be more intuitive.