TL; DR : мне нужен способ декодирования QR-кода из файла изображения с использованием (предпочтительно чистого) Python.
У меня есть файл jpg с QR-кодом, который я хочу декодировать с помощью Python. Я нашел пару библиотек, которые утверждают, что это делают:
PyQRCode ( веб-сайт здесь ), который предположительно может декодировать qr-коды из изображений, просто указав такой путь:
import sys, qrcode
d = qrcode.Decoder()
if d.decode('out.png'):
print 'result: ' + d.result
else:
print 'error: ' + d.error
So I simply installed it using sudo pip install pyqrcode
. The thing I find strange about the example code above however, is that it only imports qrcode
(and not pyqrcode
though) Since I think qrcode
refers to this library which can only generate qr-code images it kind of confused me. So I tried the code above with both pyqrcode
and qrcode
, but both fail at the second line saying AttributeError: 'module' object has no attribute 'Decoder'
. Furthermore, the website refers to Ubuntu 8.10 (which came out more than 6 years ago) and I can't find a public (git or other) repository of it to check the latest commit. So I moved on to the next library:
ZBar (website here) claims to be "an open source software suite for reading bar codes from various sources, such as image files."
So I tried installing it on Mac OSX running sudo pip install zbar
. This fails with error: command 'cc' failed with exit status 1
. I tried to suggestions in the answers to this SO question, but I can't seem to solve it. So I decided to move on again:
QRTools, which according to this blogpost can decode images easily by using the following code:
from qrtools import QR
myCode = QR(filename=u"/home/psutton/Documents/Python/qrcodes/qrcode.png")
if myCode.decode():
print myCode.data
print myCode.data_type
print myCode.data_to_string()
So I tried installing it using sudo pip install qrtools
, which can't find anything. I also tried it with python-qrtools
, qr-tools
, python-qrtools
and a couple more combinations, but unfortunately to no avail. I suppose it refers to this repo which says it is based on ZBar (see above). Although I want to run my code on Heroku (and thus prefer a pure Python solution) I successfully installed it on a Linux box (with sudo apt-get install python-qrtools
) and tried running it:
from qrtools import QR
c = QR(filename='/home/kramer65/qrcode.jpg')
c.data # prints u'NULL'
c.data_type # prints u'text'
c.data_to_string() # prints '\xef\xbb\xbfNULL' where I expect an int (being `1234567890`)
Although this seems to decode it, It doesn't seem to do it correctly. It furthermore needs ZBar and is thus not pure Python. So I decided to find yet another library.
PyXing (website here) is supposedly a Python port of the popular Java ZXing library, but the initial and only commit is 6 years old and the project has no readme or documentation whatsoever.
For the rest I found a couple qr-encoders (not decoders) and some API endpoints which can decode for you. Since I don't like this service to be dependent on other API endpoints I would want to keep the decoding local though.
So to conclude; would anybody know how I can decode QR-codes from images in (preferable pure) Python? All tips are welcome!