zbar.py

#Install zbar and Pyzbar (pyzbar only if you are using Python version 3 or later)
#!pip install zbar
#!pip install pyzbar

#Ubuntu:
#sudo apt-get update
#sudo apt-get -y install zbar-tools
#two options to install pyzbar:
#pip install pyzbar
#Download the file 'python3-pyzbar_0.1.8-3.1_all.deb' from: http://ftp.ubuntu.com/ubuntu/ubuntu/pool/universe/p/pyzbar/ 

#Import libraries 
import cv2 as cv
import numpy as np
import pyzbar.pyzbar as pzb
#from pyzbar.pyzbar import decode


# Create a function to detect Qrcode and Barcode
webcam = cv.VideoCapture(1) #define your computer webcam
def detector(webcam): 
    
    while(True):
      
        # Capture the video frame by frame
        _, frame = webcam.read()
        
        # Find barcodes and Qr
        for barcode in pzb.decode(frame):
            
            # Print the data got from the barcode lecture
            #print(barcode.data)
            
            # Convert de data from bytes to string
            mydata = barcode.data.decode('utf-8')
            print(mydata)
            
            # Add bounding box to qr codes and barcodes
            points = np.array([barcode.polygon], np.int32)
            
            # Print the possition of the qr code or barcode
            #print(points)
            
            points = points.reshape (-1,1,2)
            cv.polylines(frame, [points], True, (255,0,0),5) #draw a polygon on an image
            
            # Add text over the bounding box
            points2 = barcode.rect                                                             #creates a rectangle around the bar code
            pos = (points2[0], points2[1])                                                     #possition using to write the data decoded from the bar code
            x,y = pos                                                                          #two variables to set the x and y possition of the rectangle that enclose the data decoded from the bar code
            text_size, _ = cv.getTextSize(mydata, cv.FONT_HERSHEY_SIMPLEX, 1, 0)               #use to get the size of the data
            text_w, text_h = text_size                                                         #variables used to set the weight and height of the rectangle that enclose the data
            cv.rectangle(frame, pos, (x + text_w, y - text_h), (255, 0, 0), -1)                #rectangle used to enclose the data
            cv.putText(frame, mydata, pos, cv.FONT_HERSHEY_SIMPLEX,
                      0.9, (255,255,255), 2)                                                   #write the data decoded from the bar code
  
        # Display the resulting frame
        cv.imshow('frame', frame)
      
        #the 'd' button is set as the quitting button
        if cv.waitKey(1) & 0xFF == ord('d'):
            webcam.release()
            cv.destroyAllWindows()
            break

#Main             
if __name__ == '__main__':
    webcam = cv.VideoCapture(0)


#To execute the function run:
detector(webcam)