Document scanners are used to scan large quantities of documents in the shortest possible time. They are used in the paperless office, in banks and insurance companies as well as in libraries in order to be able to archive documents as space savingly and efficiently as possible. The process of capturing documents is called scanning.
Many models are able to scan the front and back of a sheet of paper at the same time using two CCD sensor strips (duplex). Some models are designed as a combination of sheet-fed and flatbed scanners in order to scan bound documents too without damaging them. The scanning quality depends on the selected or available resolution. The optical resolution of document scanners is usually 200-400 ppi and can be as high as 600-1400 ppi.
The speed of the scanner depends on the design, the intended application and the selected scan resolution. For workplace scanners, the typical values are 25 DIN A4 pages/minute. With central high-performance systems, up to 500 DIN A4 pages/minute can be captured on both sides. Content is often extracted for further processing using text recognition software (OCR).