tesseract: tesseract (OCR Engine) tesseract: tesseract: Tesseract is a commercial quality OCR engine originally developed tesseract: at HP between 1985 and 1995. In 1995, this engine was among the tesseract: top 3 evaluated by UNLV. It was open-sourced by HP and UNLV in tesseract: 2005. tesseract: tesseract: tesseract: tesseract: tesseract: