Important: if you are using NVDA 2017.3 or later on Windows 10, please disable this add-on.

Performs optical character recognition (OCR) to extract text from an object which is inaccessible. The Tesseract OCR engine is used. To perform OCR, move to the object in question using object navigation and press NVDA+r. You can set the OCR recognition language by going to the NVDA preferences menu and selecting OCR settings.