sparkfish/pdf417decoder

PDF417 Decoder available in Python

pdf417decoder's Issues

Unable to install pdf417decoder

I am trying to install pdf417decoder. I am using command:
pip install pdf417decoder
but everytime I get following error :
ERROR: Could not find a version that satisfies the requirement pdf417decoder (from versions: none)
ERROR: No matching distribution found for pdf417decoder

Can you please help me out to install the package

Cannot decode barcodes which are not padded

I noticed that barcodes which don't have any padding cannot be decoded. I'm using the following code to test:

import sys
from PIL import Image
from pdf417decoder import PDF417Decoder

image = Image.open(sys.argv[1])
decoder = PDF417Decoder(image)

if decoder.decode() > 0:
    decoded = decoder.barcode_data_index_to_string(0)
    print(decoded)
else:
    print("cannot decode")

The following image cannot be decoded:

While the following image can:

Images are the same, except that second image has 1px of white padding around the barcode, while the first image touches the image borders.

Error Decoding

Whenever I try to run the decoder.decode() dommand, I get the following error. Do you have any suggestions? Thanks!

UnboundLocalError: local variable 'codewords_ptr' referenced before assignment

pdf417 decoder failing to decode always

this is the code i tried :

from pdf417decoder import PDF417Decoder
import matplotlib.pyplot as plt
import cv2
from PIL import Image 
npimg = cv2.imread("/content/bar.png")
image = Image.fromarray(npimg)
plt.imshow(image)
decoder = PDF417Decoder(image)

if (decoder.decode() > 0):
    print('decoding')
    decoded = decoder.barcode_data_index_to_string(0)
else:
  print('could not decode')
  

for this high resolution image : https://i.ibb.co/SypTDfh/bar.png

also cropped the barcode region and tried again,,no luck,always failing to decode(returns nothing)

Mac Users -- pdf417decoder crashes upon import, with fix

Reading through the stack trace it appears it's looking for ffmpeg.

I don't know if this is something that can be fixed in this repo/library but I figured I'd report it so that it's known and what the fix is.

Issue

Computer: Apple MacBook Pro 16" with Apple Silicon M1
Running Python 3.9.6 in Terminal.app

>>> import pdf417decoder
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/python3.9/site-packages/pdf417decoder/__init__.py", line 1, in <module>
    from pdf417decoder.Decoder import PDF417Decoder
  File "/python3.9/site-packages/pdf417decoder/Decoder.py", line 4, in <module>
    import cv2
  File "/python3.9/site-packages/cv2/__init__.py", line 5, in <module>
    from .cv2 import *
ImportError: dlopen(/python3.9/site-packages/cv2/cv2.cpython-39-darwin.so, 2): Library not loaded: /opt/homebrew/opt/ffmpeg/lib/libavcodec.58.dylib
  Referenced from: /python3.9/site-packages/cv2/cv2.cpython-39-darwin.so
  Reason: image not found

Fix

I installed ffmpeg through Homebrew and it ran fine.