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02:19
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Q: After installing OpenCV, the qr code detector is missing: AttributeError: module 'cv2' has no attribute 'QRCodeDetector'

PedroskiI am dabbling with qr codes in Python. I installed like this: sudo apt install opencv-python3 I am following the instructions here. When I get to: detector = cv2.QRCodeDetector() I get this error in the Python shell: detector = cv2.QRCodeDetector() Traceback (most recent call last): File "<...

python3
Kasonnara
Kasonnara
Which version of opencv did you get? QR Code reader need version 4.0 or newer. I know that pip3 install opencv-contrib-python give a recent version. I don't now for the apt version. However I only found a python3-opencv package not opencv-python3.
Pedroski
Pedroski
How would I get the version? I suppose it is fairly recent, from the Ubuntu repositories, but maybe not the very latest version. I don't really need cutting-edge stuff. I tried pip3 install python3-opencv but this also fails: not found error.
Kasonnara
Kasonnara
pip doesn't have a package python3-opencv, that's the name of the apt package. There is many pip package that install opencv, personnaly I used opencv-contrib-python. Also to get the opencv version you can run import cv2 in a python interpreter, then print cv2.version.opencv_version
Also note that, when you don't find a package, the seach command is useful to find the exact name, apt search <some keyword> or pip3 search <some keyword>.
Pedroski
Pedroski
Thank you very much! pip3 search opencv (I didn't know that) shows me many many packages!! How can I get them all?
pip3 install opencv-python fails with the error: ModuleNotFoundError: No module named 'skbuild'
Kasonnara
Kasonnara
PyPI FAQ provide the solution to that error
it says that your pip install isn't up to date
Pedroski
Pedroski
02:22
pip3 install opencv-contrib-python is working, but the download is slow. 6KB/s When its loaded I will try again, see if the detector works! Thank you very much for your help and advice!
Kasonnara
Kasonnara
pip install --upgrade pip
Pedroski
Pedroski
I know, I read that, but pip will not upgrade!! I tried that yesterday!
Kasonnara
Kasonnara
Yeah I'm not sure but I think the contrib version is may be havier with more modules included
Pedroski
Pedroski
Thank you again for your advice!
Kasonnara
Kasonnara
Ok, that's kind of problematic
You're welcome
Pedroski
Pedroski
03:17
Ok, the download finally finished, I restarted the Python shell, detector = cv2.QRCodeDetector() works now, no problem!! Thanks again for your help!
Kasonnara
Kasonnara
03:29
Great, have fun :)

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