Demo of a QR scanner that repeatedly scans and looks for QR codes

qrscan.py

import PIL
from PIL import Image
import pyzbar.pyzbar as pyzbar
import pygame
import pygame.camera
from pygame.locals import *

# set up the camera
pygame.init()
pygame.camera.init()


# function that pulls data from the image
def read_codes(input):
    # read the QR code(s)
    codes = pyzbar.decode(input)

    # Print results
    for this_code in codes:
        if "QRCODE" == this_code.type:
            print('DETECTED: {}'.format(str(this_code.data)))

    return codes


# main function
if __name__ == '__main__':

    # use the first camera in the list
    camlist = pygame.camera.list_cameras()
    DEVICE = camlist[0]

    # reasonably high res
    SIZE = (1280, 720)
    camera = pygame.camera.Camera(DEVICE, SIZE, "RGB")

    # start capture
    camera.start()

    while True:
        image = camera.get_image()
        pygame.image.save(image, "input.jpg")

        # read the image
        input_image = PIL.Image.open("input.jpg")

        # check the image
        result = read_codes(input_image)