In computing, a scanner is a device that analyzes images, printed text, or
handwriting, or an object (such as an ornament) and converts it to a
digital image. Most scanners today are variations of the desktop (or flatbed) scanner. The flatbed scanner is the most common in offices. Hand-held scanners, where the device is moved by hand, were briefly popular but are now not used due to the difficulty of obtaining a high-quality image. Both these types of scanners use
charge-coupled device (CCD) or
Contact Image Sensor (CIS) as the image sensor, whereas older drum scanners use a
photomultiplier tube as the image sensor.
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