QRCode.py

from __future__ import print_function
import pyzbar.pyzbar as pyzbar
import numpy as np
import cv2


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
        print(points)
        # 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.imwrite("images/qr_code_test.JPG", im)
    #cv2.imshow("Results", im)
    cv2.waitKey(0)

# Read image
# im = cv2.imread('images/qr_code_test8.jpg')
im = cv2.imread('images/qr_code_fullpage_test9.jpg')
decodedObjects = decode(im)
display(im, decodedObjects)