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+--- Thread: qrcode detector not in cv2 (/thread-29683.html)
qrcode detector not in cv2 - Pedroski55 - Sep-15-2020
I am just following the instructions here, trying to learn how this works.
I am now trying to read a qr code I made.
this shows no errors:
Quote:# read the QRCODE image
img1 = cv2.imread("myQR_blue.png")
But this does not work:
Quote:# initialize the cv2 QRCode detector
detector = cv2.QRCodeDetector() # whoops, doesn't work!
I get this in Idle:
Quote:>>> detector = cv2.QRCodeDetector()
Traceback (most recent call last):
File "<pyshell#20>", line 1, in <module>
detector = cv2.QRCodeDetector()
AttributeError: module 'cv2' has no attribute 'QRCodeDetector'
The webpage says it was updated September 2020.
I installed cv2 from Ubuntu: sudo apt-get install python3-opencv
How do I get the detector?
RE: qrcode detector not in cv2 - bowlofred - Sep-15-2020
If you do
dir(cv2) in your REPL, do you get lots and lots of objects? Could you show some of the output?If you don't, I suspect your cv2 module is being shadowed by some other file locally.
>>> len(dir(cv2)) 1946 >>> dir(cv2) ['', 'ACCESS_FAST', 'ACCESS_MASK', 'ACCESS_READ', 'ACCESS_RW', 'ACCESS_WRITE', 'ADAPTIVE_THRESH_GAUSSIAN_C', 'ADAPTIVE_THRESH_MEAN_C', 'AGAST_FEATURE_DETECTOR_AGAST_5_8', 'AGAST_FEATURE_DETECTOR_AGAST_7_12D', 'AGAST_FEATURE_DETECTOR_AGAST_7_12S', 'AGAST_FEATURE_DETECTOR_NONMAX_SUPPRESSION', 'AGAST_FEATURE_DETECTOR_OAST_9_16', 'AGAST_FEATURE_DETECTOR_THRESHOLD', 'AKAZE', 'AKAZE_DESCRIPTOR_KAZE', 'AKAZE_DESCRIPTOR_KAZE_UPRIGHT', 'AKAZE_DESCRIPTOR_MLDB', ...
RE: qrcode detector not in cv2 - Pedroski55 - Sep-16-2020
EDIT: SOLVED: with advice from askubuntu, I downloaded
pedro@pedro-512ssd:~$ pip3 install opencv-contrib-python
Now the detector works!!
Thanks for the reply:
I got this info:
Quote:>>> cv2
<module 'cv2' from '/usr/lib/python3/dist-packages/cv2.cpython-36m-x86_64-linux-gnu.so'>
>>> len(dir(cv2))
1704
>>> dir(cv2) (gives "squeezed text" because the output is very long)
>>>
Looks like my cv2 is significantly shorter than your cv2 1704 to 1946!
Maybe that's why the module is missing!
How to change this? I have tried to install opencv- from pip3, but the install fails.
Quote:pedro@pedro-512ssd:~$ pip3 install opencv-python
Collecting opencv-python
Using cached https://files.pythonhosted.org/packages/77/f5/49f034f8d109efcf9b7e98fbc051878b83b2f02a1c73f92bbd37f317288e/opencv-python-4.4.0.42.tar.gz
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip-build-aop87qrl/opencv-python/setup.py", line 9, in <module>
import skbuild
ModuleNotFoundError: No module named 'skbuild'
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-aop87qrl/opencv-python/