Image scanner

In computing, an image scanner—often abbreviated to just scanner, although the term is ambiguous out of context (barcode scanner, CAT scanner, etc.)—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.

Modern scanners typically use a charge-coupled device (CCD) or a contact image sensor (CIS) as the image sensor, whereas drum scanners, developed earlier and still used for the highest possible image quality, use a photomultiplier tube (PMT) as the image sensor. A rotary scanner, used for high-speed document scanning, is a type of drum scanner that uses a CCD array instead of a photomultiplier. Non-contact planetary scanners essentially photograph delicate books and documents. All these scanners produce two-dimensional images of subjects that are usually flat, but sometimes solid; 3D scanners produce information on the three-dimensional structure of solid objects.

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Latest News for: optical scanner

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OnePlus 13R or Galaxy A56? Key differences you must know before buying

Hindustan Times 24 Mar 2025
The Samsung Galaxy A56 and the OnePlus 13R are two of the latest mid-range smartphones in the Indian market ... Oneplus 13R comes with a starting price of Rs.42999 in India. (Oneplus 13R) ... Both phones feature optical fingerprint scanners for biometrics.
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Imec and Zeiss extend strategic partnership

Eweekly 21 Mar 2025
... process, and measurement technologies for semiconductor manufacturing but also by providing lithography optics, integrated into the lithography scanner systems of the strategic partner ASML.
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John Rawls and the Trumpocene: A Eulogy for Justice

WhoWhatWhy 19 Mar 2025
The Wise Veil of Ignorance ... Where To Put That Right-Field Fence ... Perhaps ... SAVE ... Then a close read reveals that the MESA text does not actually ban optical scanners — which are, in fact, programmable vote-counting computers — or mandate hand counting.
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Nothing Phone 3a Pro review: funky mid-ranger with real zoom camera

The Observer 17 Mar 2025
The screen is a large and fast OLED, which looks really good and has fast optical fingerprint scanner under it towards the bottom.Specifications ... A fast and accurate optical fingerprint scanner is in ...
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NECO Purchases N500m Optimal Mark Registration Machine

This Day 06 Mar 2025
The National Examinations Council (NECO) has acquired a high performance Optical Mark Recognition (OMR) Scanner worth N500 million which it says will enhance efficiency, Credibility and Security of its examinations.
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