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Using Python for Reading and Writing Optical Labels

Reading and Writing Data Matrix Codes

Explore how to use Python to encode data into Data Matrix barcodes and decode them from images. Learn to employ pylibdmtx and Pillow libraries to create, read, and annotate Data Matrix code images, enabling practical applications in barcode processing.

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Writing data to the Data Matrix

To encode data into a Data Matrix barcode, we can do as in the following example:

Python 3.10.4
from pylibdmtx.pylibdmtx import encode 
from PIL import Image, ImageDraw
data = 'educative'.encode('utf8')
encoded = encode(data)
img = Image.frombytes('RGB', (encoded.width, encoded.height), encoded.pixels)  
img.save('output/dmtx.png')

Lines 1–2: First, we import the encode() from the pylibdmtx library and the Image and ImageDraw classes from the Pillow library.

Line 4: Then, we can encode the data. For this example, we’ll encode the name of our course platform, educative. From the documentation of the library, it seems to be recommended to encode the data string as utf-8. Nevertheless, we could experiment with other encodings here.

Lines 6–7: ...