Scanner

A scanner is an input device that takes in an optical image and digitizes it into an electronic image that is represented by digital data.
==Description==
A scanner can be used to create a computerized reproduction of a printed photo or illustration. It can also be used with optical character recognition (OCR) software to process printed documents into electronic text without having to manually type them in through a keyboard.. 1995-02-14. A 's horizontal resolution, typically measured in dots per inch (dpi), is determined by the number of sensors in the CCD array that scans the document, row-by-row. The vertical resolution is determined by the precision of the , which can be higher than the resolution of the CCD. Some scanners offer interpolation, which can attain a target resolution higher that what the scanner hardware is capable of by computing the pixels in between adjacent pixels.How Scanners Work: Resolution and Interpolation by Jeff Tyson, How Stuff Works. 2001-03-21.
===History===
 led development of early flatbed scanner hardware in the 1970s for the purpose of optical character recognition for the visually impaired. The resulting device, the Kurzweil Reading Machine, was a large tabletop device that was introduced in 1976 with the ability to scan an inch-high strip of text at a time with 64 kilobytes of memory.Multifunction Printer Scanner Vs. a Flatbed Scanner by G. D. Palmer et. al., Houston Chronicle. 2018-08-03.The Kurzweil Effect by Aditi Chandrasekar, Medium. 2019-07-09.
In 1984, Apple Computer engineer Andy Hertzfeld developed the software for ThunderScan, the first scanner for Macintosh, which used an ImageWriter as a sheet-feeding device.Thunderscan by Andy Hertzfeld, Folklore. 1984-06. Apple introduced its own Apple Scanner in August 1988, leading to a succession of flatbed scanners. However, co-founder Steve Jobs discontinued the costly product line in early 1998 after rejoining Apple to return the company to profitability.The Businesses Apple Has Left Behind by Stephen Hackett, MacStories. 2016-12-15. Stand-alone consumer scanners have since been largely supplanted by all-in-one multifunction devices that incorporate a printer, allowing them to function as home office photocopiers.
==References==
==See also==
*Apple OneScanner, introduced in 1991.
*Apple Color OneScanner, introduced in 1992.
==External links==
*Apple Scanners at Apple (archived 1998-02-05, 1997-12-10)
* at Wikipedia
===Articles===
*Scanning the Scene with a Flatbed Scanner by Jason Walsh at Low End Mac (2004-08-18)