Tesseract engine
Tesseract is an open source text recognition (OCR) engine, used by MyQ in the MyQ OCR Server.
The following formats are supported with the Tesseract OCR engine:
PDF
PDFA (the compliance level of PDFA is PDFA-1B)
TXT
Tesseract supports a variety of languages, listed in Supported languages.
For further information about the engine, see the dedicated documentation from its developer.