Scan barcodes in an image using zbar, cv2 and PIL/Pillow.

scan_barcodes.py

import zbar
import cv2
from PIL import Image


def scan_barcodes(img):
    """
    Scan barcodes in image and return their data.
    :param img: Source image
    :type img: PIL.Image
    :return: A list of barcode type/data tuples.
    :rtype: list
    """
    scanner = zbar.ImageScanner()
    frame = img.convert("RGB")
    gray = cv2.cvtColor(numpy.array(frame), cv2.COLOR_BGR2GRAY, dstCn=0)
    pil = Image.fromarray(gray)
    width, height = pil.size
    zimg = zbar.Image(width, height, "Y800", pil.tobytes())
    scanner.scan(zimg)
    return [(s.type, s.data) for s in zimg]