Simple barcode scanner

barcode_scanner.py

import numpy as np
import cv2
import pyzbar.pyzbar as pyzbar

cap = cv2.VideoCapture(0)

def decode(im) : 
  # Find barcodes and QR codes
  decodedObjects = pyzbar.decode(im)
 
  # Print results
  for obj in decodedObjects:
    print('Type : ', obj.type)
    print('Data : ', obj.data,'\n')
     
  return decodedObjects
 
 
# Display barcode and QR code location  
def display(im, decodedObjects):
 
  # Loop over all decoded objects
  for decodedObject in decodedObjects: 
    points = decodedObject.polygon
 
    # If the points do not form a quad, find convex hull
    if len(points) > 4 : 
      hull = cv2.convexHull(np.array([point for point in points], dtype=np.float32))
      hull = list(map(tuple, np.squeeze(hull)))
    else : 
      hull = points;
     
    # Number of points in the convex hull
    n = len(hull)
 
    # Draw the convext hull
    for j in range(0,n):
      cv2.line(im, hull[j], hull[ (j+1) % n], (255,0,0), 3)
 
  # Display results 
  cv2.imshow("Results", cv2.resize(im, (384, 216)));

while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()

    decoded = decode(frame)
    display(frame, decoded)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()