Python Extension: MRZ Scanner SDK

The goal of this project is to provide a Python-C++ binding for Dynamsoft Label Recognizer, enabling developers to create MRZ scanner applications for both Windows and Linux platforms using Python.

License Key

Get a 30-day FREE trial license to activate the SDK.

Supported Python Edition

• Python 3.x

Install Dependencies

pip install mrz opencv-python

Command-line Usage

$ scanmrz <file-name> -l <license-key>

# Show the image with OpenCV
$ scanmrz <file-name> -u 1 -l <license-key>

Quick Start

import mrzscanner
from mrz.checker.td1 import TD1CodeChecker
from mrz.checker.td2 import TD2CodeChecker
from mrz.checker.td3 import TD3CodeChecker
from mrz.checker.mrva import MRVACodeChecker
from mrz.checker.mrvb import MRVBCodeChecker

def check(lines):
    try:
        td1_check = TD1CodeChecker(lines)
        if bool(td1_check):
            return "TD1", td1_check.fields()
    except Exception as err:
        pass
    
    try:
        td2_check = TD2CodeChecker(lines)
        if bool(td2_check):
            return "TD2", td2_check.fields()
    except Exception as err:
        pass
    
    try:
        td3_check = TD3CodeChecker(lines)
        if bool(td3_check):
            return "TD3", td3_check.fields()
    except Exception as err:
        pass
    
    try:
        mrva_check = MRVACodeChecker(lines)
        if bool(mrva_check):
            return "MRVA", mrva_check.fields()
    except Exception as err:
        pass
    
    try:
        mrvb_check = MRVBCodeChecker(lines)
        if bool(mrvb_check):
            return "MRVB", mrvb_check.fields()
    except Exception as err:
        pass
    
    return 'No valid MRZ information found'

# set license
mrzscanner.initLicense("DLS2eyJoYW5kc2hha2VDb2RlIjoiMjAwMDAxLTE2NDk4Mjk3OTI2MzUiLCJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSIsInNlc3Npb25QYXNzd29yZCI6IndTcGR6Vm05WDJrcEQ5YUoifQ==")

# initialize mrz scanner
scanner = mrzscanner.createInstance()

# load MRZ model
scanner.loadModel(mrzscanner.load_settings())

print('')
# decodeFile()
s = ""
results = scanner.decodeFile("images/1.png")
for result in results:
    print(result.text)
    s += result.text + '\n'
print('')
print(check(s[:-1]))
print('')

Methods

• mrzscanner.initLicense('YOUR-LICENSE-KEY') # set the license globally

  mrzscanner.initLicense("DLS2eyJoYW5kc2hha2VDb2RlIjoiMjAwMDAxLTE2NDk4Mjk3OTI2MzUiLCJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSIsInNlc3Npb25QYXNzd29yZCI6IndTcGR6Vm05WDJrcEQ5YUoifQ==")

• mrzscanner.createInstance() # create a MRZ scanner instance

  scanner = mrzscanner.createInstance()

• scanner.loadModel(<model configuration file>) # load MRZ model

  scanner.loadModel(mrzscanner.load_settings())

• decodeFile(<image file>) # recognize MRZ from an image file

  results = scanner.decodeFile(<image-file>)
  for result in results:
      print(result.text)

• decodeMat(<opencv mat data>) # recognize MRZ from OpenCV Mat

  import cv2
  image = cv2.imread(<image-file>)
  results = scanner.decodeMat(image)
  for result in results:
      print(result.text)

• addAsyncListener(callback function) # start a native thread and register a Python function for receiving the MRZ recognition results

• decodeMatAsync(<opencv mat data>) # recognize MRZ from OpenCV Mat asynchronously

  def callback(results):
      s = ""
      for result in results:
          print(result.text)
          s += result.text + '\n'
  
      print('')
      print(check(s[:-1]))
  
  import cv2
  image = cv2.imread(<image-file>)
  scanner.addAsyncListener(callback)
  for i in range (2):
      scanner.decodeMatAsync(image)
      sleep(1)

How to Build the Python MRZ Scanner Extension

• Create a source distribution:

  python setup.py sdist

• setuptools:

  python setup.py build
  python setup.py develop 

• Build wheel:

  pip wheel . --verbose
  # Or
  python setup.py bdist_wheel