A ctypes-based Python wrapper around the zbar
barcode reader.
The
zbar
wrapper is stuck in Python 2.x-land.
The zbarlight wrapper doesn't
provide support for Windows and depends upon Pillow.
This ctypes-based wrapper brings zbar to Python 2.7 and to Python 3.4 or
greater.
The zbar DLLs are included with the Windows Python wheels.
On other operating systems, you will need to install the zbar shared library.
On Mac OS X:
brew install zbar
On Linux:
sudo apt-get install libzbar0
Install this Python wrapper; use the second form to install dependencies of the command-line scripts:
pip install pyzbar
pip install pyzbar[scripts]
The decode function accepts instances of PIL.Image.
>>> from pyzbar.pyzbar import decode
>>> from PIL import Image
>>> decode(Image.open('pyzbar/tests/code128.png'))
[Decoded(data=b'Foramenifera', type='CODE128'),
Decoded(data=b'Rana temporaria', type='CODE128')]
It also accepts instances of numpy.ndarray, which might come from loading
images using OpenCV.
>>> import cv2
>>> decode(cv2.imread('pyzbar/tests/code128.png'))
[Decoded(data=b'Foramenifera', type='CODE128'),
Decoded(data=b'Rana temporaria', type='CODE128')]
You can also provide a tuple (pixels, width, height), where the image data
is eight bits-per-pixel.
>>> image = cv2.imread('pyzbar/tests/code128.png')
>>> height, width = image.shape[:2]
>>> # 8 bpp by considering just the blue channel
>>> decode((image[:, :, 0].astype('uint8').tobytes(), width, height))
[Decoded(data=b'Foramenifera', type='CODE128'),
Decoded(data=b'Rana temporaria', type='CODE128')]
>>> # 8 bpp by converting image to greyscale
>>> grey = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
>>> decode((grey.tobytes(), width, height))
[Decoded(data=b'Foramenifera', type='CODE128'),
Decoded(data=b'Rana temporaria', type='CODE128')]
>>> # If you don't provide 8 bpp
>>> decode((image.tobytes(), width, height))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/lawh/projects/pyzbar/pyzbar/pyzbar.py", line 102, in decode
raise PyZbarError('Unsupported bits-per-pixel [{0}]'.format(bpp))
pyzbar.pyzbar_error.PyZbarError: Unsupported bits-per-pixel [24]
zbar's default behaviour is (I think) to decode all symbol types.
You can ask zbar to look for just your symbol types (I have no idea of the
effect of this on performance)
>>> from pyzbar.pyzbar import ZBarSymbol
>>> # Look for just qrcode
>>> decode(Image.open('pyzbar/tests/qrcode.png'), symbols=[ZBarSymbol.QRCODE])
[Decoded(data=b'Thalassiodracon', type='QRCODE')]
>>> # If we look for just code128, the qrcodes in the image will not be detected
>>> decode(Image.open('pyzbar/tests/qrcode.png'), symbols=[ZBarSymbol.CODE128])
[]
pyzbar is distributed under the MIT license (see LICENCE.txt).
The zbar shared library is distributed under the GNU Lesser General Public
License, version 2.1 (see zbar-LICENCE.txt).
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