如何在（最好是纯净的）Python中解码QR码图像？ [英] How to decode a QR-code image in (preferably pure) Python?

问题描述

TL; DR ：我需要一种使用（最好是纯Python）从图像文件解码QR码的方法。

TL;DR: I need a way to decode a QR-code from an image file using (preferable pure) Python.

我有一个带有QR码的jpg文件，我想使用Python对其进行解码。我找到了一些声称可以做到这一点的库：

I've got a jpg file with a QR-code which I want to decode using Python. I've found a couple libraries which claim to do this:

PyQRCode （此处的网站），据说只需提供以下路径即可解码图像中的二维码：

PyQRCode (website here) which supposedly can decode qr codes from images by simply providing a path like this:

import sys, qrcode
d = qrcode.Decoder()
if d.decode('out.png'):
    print 'result: ' + d.result
else:
    print 'error: ' + d.error

所以我只是使用 sudo pip install pyqrcode 进行安装。我对上面的示例代码感到奇怪的是，它仅导入 qrcode （尽管不是 pyqrcode ）由于我认为 qrcode 是指此库它只能生成 qr码图像，这令我感到困惑。所以我用 pyqrcode 和 qrcode 尝试了上面的代码，但是都在第二行说 AttributeError：模块对象没有属性解码器 。此外，网站指的是Ubuntu 8.10（发布于6年前），我找不到它的公共（git或其他）存储库以检查最新提交。所以我进入下一个库：

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 （网站）声称是一个开放源代码软件套件，用于从各种来源（例如图像文件）读取条形码。 尝试在运行 sudo pip install zbar 的Mac OSX上安装它。此操作失败，并显示错误：命令 cc失败，退出状态为1 。我尝试在此答案的答案中提出建议问题，但我似乎无法解决。因此，我决定再次继续：

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 ，根据此博客文章可以使用以下代码轻松解码图像：

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()

所以我尝试使用 sudo pip install qrtools 安装它，但找不到任何东西。我还尝试了 python-qrtools ， qr-tools ， python-qrtools 和更多其他组合，但不幸的是无济于事。我想它是指此存储库，它说它基于ZBar（请参见上文）。尽管我想在Heroku上运行我的代码（因此更喜欢使用纯Python解决方案），但我已成功将其安装在Linux机器上（使用 sudo apt-get install python-qrtools ）并尝试运行它：

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`)

尽管这似乎可以对其进行解码，似乎做得不正确。此外，它需要ZBar，因此不是纯Python。因此，我决定再找一个图书馆。

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 （此处的网站）应该是流行的Java ZXing库的Python端口 a>，但最初且唯一的提交已使用6年，并且该项目没有自述文件或文档。

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.

对于其余的我发现了几个qr- en 编码器（不是 de 编码器）和一些可以为您解码的API端点。由于我不希望该服务依赖于其他API端点，因此我希望将解码保持在本地。

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.

有谁知道我如何用（最好是纯净的）Python从图像中解码QR码？欢迎所有提示！

So to conclude; would anybody know how I can decode QR-codes from images in (preferable pure) Python? All tips are welcome!

推荐答案

您可以尝试使用 qrtools ：

• 创建 qrcode 文件（如果尚未创建）现有

• Create a qrcode file, if not already existing

• 我使用了 pyqrcode 为此，可以使用 pip install pyqrcode
$ b $安装b

• 然后使用代码：

• I used pyqrcode for doing this, which can be installed using pip install pyqrcode

• And then use the code:

>>> import pyqrcode
>>> qr = pyqrcode.create("HORN O.K. PLEASE.")
>>> qr.png("horn.png", scale=6)

使用对现有的 qrcode 文件进行解码 qrtools

Decode an existing qrcode file using qrtools

• 安装 qrtools 使用 sudo apt-get install python-qrtools



• 现在在python提示符下使用以下代码

• Install qrtools using sudo apt-get install python-qrtools

• Now use the following code within your python prompt

>>> import qrtools
>>> qr = qrtools.QR()
>>> qr.decode("horn.png")
>>> print qr.data
u'HORN O.K. PLEASE.'

这是一次运行的完整代码：

Here is the complete code in a single run:

In [2]: import pyqrcode
In [3]: qr = pyqrcode.create("HORN O.K. PLEASE.")
In [4]: qr.png("horn.png", scale=6)
In [5]: import qrtools
In [6]: qr = qrtools.QR()
In [7]: qr.decode("horn.png")
Out[7]: True
In [8]: print qr.data
HORN O.K. PLEASE.

注意事项

Caveats

• 您可能需要使用 pip install pypng PyPNG c>使用 pyqrcode



• 如果您有 PIL 安装后，您可能会得到 IOError：解码器zip不可用。在这种情况下，尝试使用以下方法卸载并重新安装 PIL p>
  
  

• You might need to install PyPNG using pip install pypng for using pyqrcode

• In case you have PIL installed, you might get IOError: decoder zip not available. In that case, try uninstalling and reinstalling PIL using:

pip uninstall PIL
pip install PIL

如果这不起作用，请尝试使用枕头代替

pip uninstall PIL
pip install pillow

这篇关于如何在（最好是纯净的）Python中解码QR码图像？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！