Which of the following is a function of optical character recognition?

Optical character recognition (OCR) is primarily designed to convert different types of documents, such as scanned paper documents, PDF files, or images captured by a digital camera, into editable and searchable text. This technology works by analyzing the shapes of the characters found in images and then converting them into machine-readable text.

Generating editable text from images is the key function of OCR, as it enables users to manipulate and edit the text as needed, which can significantly improve efficiency in document processing. This capability is critical in various applications, from digitizing historical texts and automating data entry to improving accessibility for visually impaired users.

The other options do not relate to the function of OCR. Enhancing video quality pertains to image processing techniques for videos, creating audio files from text relates to text-to-speech conversion, and storing scanned images for backup is about data storage rather than converting image data into editable text.