How do I Detect an EAN-13 +5 Supplement Barcode Using Python or NodeJS

Question

I'm trying to find a way to get the UPC plus the 5 number supplement barcode using Python or NodeJS.

So far I've tried using pyzbar in Python via this code.

 img = Image.open(requests.get(url, stream=True).raw)
 img = ImageOps.grayscale(img)
 results = decode(img)

That only returns the main UPC code. Not the supplemental code.

This is an example of an image I'm trying to read this from.

Answer 1

Install the dependencies (on mac + python):

$ brew install zbar
$ pip install pyzbar
$ pip install opencv-python

You can define the symbols to ZBar. Please try this python code:

import cv2
import pyzbar.pyzbar as pyzbar
from pyzbar.wrapper import ZBarSymbol

img = cv2.imread('barcode.png')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

barcodes = pyzbar.decode(gray, [ZBarSymbol.EAN13, ZBarSymbol.EAN5])

for barcode in barcodes:
    print('{}: {}'.format(barcode.type, barcode.data))

I've tested it with this image:

The result is:

EAN5: b'07900'
EAN13: b'9791234567896'

(BTW, for your image this code scans just the EAN13 part. Maybe you have to use a bigger image, or increase the contrast)