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Narrower Term: 

(also optical scanner), n. ~ 1. Computing · A device used to transform an analog image into a raster graphic. - 2. A device capable of reading and converting a coded pattern into alphanumeric data.

Notes: 

A scanner1 may be used to capture pictures or text. Scanned text may be parsed using optical character recognition (OCR) software to turn it into character data. - A scanner2 designed to read bar codes generates character data rather than an image.