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dlenski / python-zxing

python wrapper for the ZXing barcode library
GNU Lesser General Public License v3.0
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ZXing does not decode some QR images #27

Open sharifulgeo opened 1 year ago

sharifulgeo commented 1 year ago

Bug Reports

I am using zxing module of python to decode QR images like attached below. But it returns empty string.

image

I am using code like below-

from zxing import BarCodeReader fpath = r"14767.png" reader = BarCodeReader() qrcode = reader.decode(fpath) print(qrcode.raw)

Why it is returning empty string?

dlenski commented 1 year ago

Why it is returning empty string?

Good question.

If I use reader.decode(your_image, pure_barcode=True), then it does work correctly, outputting…

BarCode(raw='https://ldtax.gov.bd/ldtax-holdings/individual-rashid-print-offline/M2ZRY085bkljUkc4a3c1K3JrNlFwUT09', 
parsed='https://ldtax.gov.bd/ldtax-holdings/individual-rashid-print-offline/M2ZRY085bkljUkc4a3c1K3JrNlFwUT09', 
path='/tmp/235306398-552ee662-2fd3-4cb2-b7a4-0feb00ff50f1.png', 
format='QR_CODE', type='URI', points=[])

I wonder if this is a regression in ZXing? What is your reader.zxing_version? I'm using the latest, 3.5.1.

I note that the ZXing online decoder (https://zxing.org/w/decode.jspx) also fails to correctly decode this QR code.

dlenski commented 1 year ago

I wonder if this is a regression in ZXing? What is your reader.zxing_version? I'm using the latest, 3.5.1.

I note that the ZXing online decoder (https://zxing.org/w/decode.jspx) also fails to correctly decode this QR code.

I've also tested with ZXing 3.4.1, and get the same results. Hmmm.

I've been using --pure-barcode in all the tests, ever since d583ab0afaed8b6be50e847ddc0daee9f6dba860.