Optical character recognition. Wraps the tesseract-ocr engine.
The tesseract OCR engine
This represent a charactor that is detected by the OCR engine
When Tesseract/Cube is initialized we can choose to instantiate/load/run only the Tesseract part, only the Cube part or both along with the combiner. The preference of which engine to use is stored in tessedit_ocr_engine_mode.