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An image scanner is a digital device used to scan images, pictures, printed text and objects and then convert them to digital images. Image scanners are used in a variety of domestic and industrial applications like design, reverse engineering, orthotics, gaming and testing. The most widely used type of scanner in offices or homes is a flatbed scanner, also known as a Xerox machine. This modern image scanner is a descendant of early fax input devices and telegraphy equipment.
The image scanner was introduced in 1957 by a team led by Russell Kirsch at the U.S. National Bureau of Standards (now the National Institute of Standards and Technology).
When a document is placed inside a scanner, the image is first scanned and then the scanned data is processed and sent to a computer system. Scanners can read red-green-blue color from color array and the depth of these colors is measured based on the array characteristics. Image resolution is measured in pixels per inch.
There are various types of scanners: