How to read data matrix code in Python?

Question

I wanted to know how I can read data matrix bar code using openCV in python

I've found How to locate and read Data Matrix code with python but this is still unclear for me. I would like to show the result of reading bar code to output.

Sample data image.png I tried to decode data matrix, I get only result 5 pictures like this guy on second post. I would like to decode data matrix, but I have no Idea how i can do that. Do you know some tutorial to do this? — trieser, Feb 09 '18 at 07:16

score 7 · Answer 1 · answered Feb 13 '18 at 07:01

7

Ok after few days I've found resolution:

import cv2
from pylibdmtx.pylibdmtx import decode
import ctypes  

def Mbox(title, text, style):
    return ctypes.windll.user32.MessageBoxW(0, text, title, style)

# Read file using OpenCV
Mbox('Data Matrix', str(decode(cv2.imread('C:/Users/User/Desktop/Zdjecia_QrCode/again2.png'))), 1)

But I would like to know how I can improve reading because I cannot read every datamatrix. Do you have any idea?

answered Feb 13 '18 at 07:01

trieser

111
2
6

Have you finally found a solution? I am facing similar issues. I can read some Data Matrix, but not all of them! I would appreciate if you can share your experience. – TwinPenguins Aug 22 '19 at 13:58

score 2 · Answer 2 · edited Sep 19 '20 at 18:30

2

import numpy as np
import cv2
from pylibdmtx import pylibdmtx

if __name__ == '__main__':

    image = cv2.imread('datamatrix_sample1_130x116.png', cv2.IMREAD_UNCHANGED);

    gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

    ret,thresh = cv2.threshold(gray, 0, 255, cv2.THRESH_BINARY | cv2.THRESH_OTSU)

    msg = pylibdmtx.decode(thresh)
    print(msg)

edited Sep 19 '20 at 18:30

Suraj Rao

29,388
11
94
103

answered Sep 19 '20 at 18:18

Anand Raj

41
3

How to read data matrix code in Python?

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