Hello and thank you for posting this question.
The Text Recognition is a tool that allows you to recognise text of an image, using optical character recognition (OCR). OCR tool will recognize text and create editable and searchable electronic files from scanned paper documents, PDFs and digital pictures. The Ultimate version comes with licence that will unlock the OCR module of Expert PDF. You can set the OCR language to scan a document in a language other than your computer’s default language. Clicking one of the buttons of the Recognize Text group of the OCR ribbon tab, allows you to start the text recognition process. Save the file at the end of the process. By selecting the PDF Version from the drop down list, you define the version of the .pdf output file resulting the recognition process. The default value is set to version 1.7.
Kind regards, Expert PDF Support