QR & Bar Codes

Aiviro is capable of processing Bar codes, QR codes, including specialized formats like Czech QR invoice codes. For full list of supported code types, see classes below.

Extractors

class aiviro.actions.codes.extractors.QRCodesExtractor(images: list[ndarray], page: int = 0)

Detects and extracts QR codes from images. For a list of supported codes, see https://pypi.org/project/pyzbar/ package documentation.

Example:

>>> from aiviro.actions.codes import QRCodesExtractor, CzechQRInvoiceDecoder
>>> from numpy import ndarray
>>> image: ndarray  = ... # e.g.: load an image from a source and convert it to a numpy array
>>> qr_data = QRCodesExtractor(images=[image])()
>>> if qr_data:
>>>     decoded_data = CzechQRInvoiceDecoder(qr_data[0])()
>>>     currency = decoded_data.key_cc
>>>     total_amount = decoded_data.key_am
>>>     due_date = decoded_data.key_dt

execute() → list[CodeData]

Processes the current page to extract QR codes from the image.

Returns:: List of extracted QR codes as a CodeData objects.

class aiviro.actions.codes.extractors.BarCodesExtractor(images: list[ndarray], page: int = 0)

Inherits from BaseCodesExtractor and provides functionality for extracting specific types of bar codes (CODE39, CODE93, CODE128) from a given image. It parses the input image and processes the data to identify and retrieve bar codes in a structured format.

Example:

>>> from aiviro.modules.pdf import create_pdf_robot
>>> from aiviro.actions.codes import BarCodesExtractor, CzechQRInvoiceDecoder
>>> r = create_pdf_robot("path/to/file.pdf")
>>> bar_codes = BarCodesExtractor(images=r.pages)()
>>> if bar_codes:
>>>     print(bar_codes[0].text)

execute() → list[CodeData]

Processes the provided page to extract bar codes (CODE39, CODE93, CODE128) from the image.

Returns:: List of extracted bar codes as a CodeData objects.

class aiviro.actions.codes.extractors.AnyCodesExtractor(images: list[ndarray], code_types: list[ZBarSymbol], page: int = 0)

Extracts any codes from images provided by the user. For a list of supported codes, see https://pypi.org/project/pyzbar/ package documentation.

Parameters:

images – Source of the image data for processing
code_types – Types of codes to extract
page – Index of the page to process

Example:

>>> from aiviro.modules.pdf import create_pdf_robot
>>> from aiviro.actions.codes import AnyCodesExtractor, CzechQRInvoiceDecoder, ZBarSymbol
>>> r = create_pdf_robot("path/to/file.pdf")
>>> required_codes = [ZBarSymbol.ISBN10]  # or any other supported code type
>>> page = 1  # let's say ISBN code is on the second page
>>> isbn_codes = AnyCodesExtractor(images=r.pages, code_types=required_codes, page=page)()
>>> if isbn_codes:
>>>     print(isbn_codes[0].text)

execute() → list[CodeData]

Processes the provided page to extract required codes from the image.

Returns:: List of extracted codes as a CodeData objects.

Czech QR Decoder

class aiviro.actions.codes.decoder.CzechQRInvoiceDecoder(raw_text: CodeData)

Decodes QR data based on https://qr-faktura.cz/ format definition. See CzechQRInvoiceData for further information.

Example:

>>> from aiviro.actions.codes import QRCodesExtractor, CzechQRInvoiceDecoder
>>> from numpy import ndarray
>>> img: ndarray  = ... # e.g.: load an image from a source and convert it to a numpy array
>>> qr_data = QRCodesExtractor(images=[img])()
>>> if qr_data:
>>>     decoded_data = CzechQRInvoiceDecoder(qr_data[0])()
>>>     invoice_id = decoded_data.key_id

Data Schemas

pydantic model aiviro.actions.codes.schemas.CodeData

field box: BoundBox [Required]

field page_index: int = -1

field text: str [Required]

field type: str [Required]

pydantic model aiviro.actions.codes.schemas.CzechQRInvoiceData

Data class containing decoded data from QR code. For all possible keys, see https://www.kdpcr.cz/informace/qr-faktura/popis-formatu

field key_acc: str | None = None

field key_am: Decimal | None = None

field key_cc: str | None = None

field key_dd: date | None = None

field key_dt: date | None = None

field key_duzp: date | None = None

field key_fx: Decimal | None = None

field key_fxa: Decimal | None = None

field key_id: str | None = None

field key_ini: str | None = None

field key_inr: str | None = None

field key_msg: str | None = None

field key_on: str | None = None

field key_t0: Decimal | None = None

field key_t1: Decimal | None = None

field key_t2: Decimal | None = None

field key_tb0: Decimal | None = None

field key_tb1: Decimal | None = None

field key_tb2: Decimal | None = None

field key_vii: str | None = None

field key_vir: str | None = None

field key_vs: str | None = None

field raw_values: dict[str, str] [Optional]

classmethod from_raw_values(values: dict[str, str]) → CzechQRInvoiceData: Populate fields from values dictionary