Create and read QR code with Python in 3 minutes (OpenCV and qrcode)
Today we will create a QR code in Python, and read it using OpenCV.
You can split the article into two parts:
- create QR code in Python.
- scan QR code using OpenCV on video.
Step 1 - create a Python QR code
Prepare a virtual environment for your project in virtualenv.
(Repo: https://github.com/fuwiak/qr_code)
# terminal(Bash)
virtualenv -p python3 env #create virtual env with name 'env'
source env/bin/activate #activate enviroment 'env'
pip install -r requirements.txt # install python modulesHere we generate a QR-code using the qrcode library:
import qrcode
img_name = "medium.png"
def generate(data="https://habr.com", img_name="habr.png"):
img = qrcode.make(data) #generate QRcode
img.save(img_name)
return img
generate()# in command line
python3 generate_qr.py
Here is and is obtained in our folder such a the:
Uploading an image:
def read_qr(img_name):
import cv2
img = cv2.imread(img_name)
return img qr = read_qr(img_name) #<class 'numpy.ndarray'>
By the way, if someone has to do image processing(approximately QR-code), you can do it in scikit-image.
I wrote a simple tutorial on this topic. https://medium.com/@stasinskipawel/image-processing-with-python-scikit-image-de3969533701
Step 2-scan the QR code with OpenCV on video
# command line
python3 video.pyJust attach the QR-code to the camera:
import cv2def video_reader():
cam = cv2.VideoCapture(0)
detector = cv2.QRCodeDetector()
while True:
_, img = cam.read()
data, bbox, _ = detector.detectAndDecode(img)
if data:
print("QR Code detected-->", data)
cv2.imshow("img", img)
if cv2.waitKey(1) == ord("Q"):
break
cam.release()
cv2.destroyAllWindows()video_reader()
To turn off the program press the keyboard “Q”.
That’s all, I invite everyone to ask questions and evaluate.
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