optical scanner


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to optical scanner: OCR, Drum scanner

optical scanner

[′äp·tə·kəl ′skan·ər]
(electronics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

scanner

(1) A synonym for antivirus program.

(2) A smartphone application that reads barcodes. See mobile tagging.

(3) An optical device that reads a printed page or transparency and converts it into a graphics image for the computer. The scanner does not recognize or differentiate in any manner the content of the material it is scanning. Everything is converted into a bitmapped image, which is a pattern of dots. See bitmapped graphics.

Optical Character Recognition (OCR)
Optical character recognition systems use scanners to capture printed text and convert it into computer-readable characters for editing. See OCR and document scanner.

Scanners and Cameras
Scanners are similar to digital cameras, except cameras can focus into infinity. Desktop scanners have physical dimensions that determine the size and bulk of the material that can be scanned. Automatic feeders are used to scan stacks of paper, typically for OCR jobs.

Scanners are rated in dots per inch (dpi), whereas cameras are rated in total pixels. Both scanners and cameras have an optical resolution (the real lens resolution) and an interpolated resolution computed by software. The higher the optical, the better.

Scanners are also rated by the maximum color depth of each pixel (how many colors can be stored). At minimum, scanners support 24-bit color, and many go up to 48 bits. See optical resolution, interpolated resolution, 4K resolution, document scanner, flatbed scanner, sheet-fed scanner, handheld scanner, drum scanner, slide scanner, photo scanner and digital camera.


Desktop Scanners
The flatbed scanner is the most common desktop scanner. A transparency adapter provides a light source from the top for scanning 35mm slides and film negatives. Slide scanners are specialized for only slides and film (see slide scanner).







High-End Drum Scanner
Drum scanners are used for commercial graphics production and applications that require the highest quality scanning (see drum scanner). This earlier Howtek scanner provided an optical resolution up to 4,000 dpi. (Image courtesy of Howtek, Inc.)
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
On the basis of product type, the 3D scanning market can be categorized into laser scanner, structure light scanner, optical scanner, and others.
The state is planning on replacing the optical scanners by late 2018, Woodhams said.
The machine, which is a dual-sided optical scanner, tabulates the votes as the ballots are fed in.
Bo concluded, "The optical scanners while not the latest technology have proven reliable and long lived ...
The CAD model has been created with Delcam's CopyCAD reverse engineering software from scan data captured from a life-size sculpture using a Breuckmann optical scanner.
The viscometer links a laptop computer, an optical scanner, and a closed system of tubing containing the blood sample.
Designed for students, travelers and executives, users just move an optical scanner over a word for automatic translation.
They are read by an optical scanner (either a hand-held device or a freestanding model like the ones used in supermarkets) that converts the code into computer language for storage and analysis.
Transmission through the precinct count optical scanner (PCOS) occurs in seconds, and the results are encrypted with the use of a virtual private network (VPN), which further protects sensitive data, he explained.
Such effort gave birth to the cooperation between KOICA and SDC in supporting more modernized election with precinct count optical scanner to the six cities of Batken, Jalal-Abad, Kant, Karakol, Naryn, and Talas from the support of the SDC.
The voter then feeds the marked portion, which includes an encrypted version of the names and their order, through an optical scanner to record the vote in the election system.

Full browser ?