Scanner

Scanner

A scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Commonly used in offices are variations of the desktop flatbed scanner where the document is placed on a glass window for scanning. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications. Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical.

Types of Scanners

Flatbed Scanners

Flatbed scanners, also called desktop scanners, are the most versatile and commonly used scanners. In these scanners, a glass pane (platen) is needed for scanning.

Handheld Scanners

Handheld scanners use the same basic technology as a flatbed scanner, but rely on the user to move them instead of a motorized belt. This type of scanner typically does not provide good image quality. However, it can be useful for quickly capturing text.

Sheetfed Scanners

Sheetfed scanners are similar to flatbed scanners except the document is moved and the scan head is immobile. A sheetfed scanner looks a lot like a small portable printer.

Drum Scanners

Drum scanners capture image information with photomultiplier tubes (PMT), rather than the charge-coupled device (CCD) arrays found in flatbed scanners and inexpensive film scanners.

Applications

Scanners are used to digitize physical documents and images for editing, archiving, sharing, and electronic transmission. They are commonly used in offices, libraries, and in the home.

See Also

• Image scanner
• 3D scanner
• Digital camera
• Fax
• Photocopier
• Printing

Scanner Resources
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