a person or thing that scans.
See under optical scanning.
Photography. any device for exposing an image on film, a sensitized plate, etc., by tracing light along a series of many closely spaced parallel lines.
(in aerial photography) a device for estimating the ratio of aircraft speed to aircraft altitude.
a photoelectric device for scanning a picture to determine automatically the density of the hue or value in each area for transmission by wire or radio or for preparation of color process printing plates.
a computer-aided electronic system using photoelectric cells to separate copy, as color illustrations, into its primary colors, correct color copy, and produce a set of color separations ready for proofing or printing.
Radio. a radio receiver, used especially by police, firefighters, and the press, that continuously tunes to preselected frequencies, broadcasting any signal that it detects.
Medicine/Medical, Biology. a device for examining a body, organ, tissue, or other biologically active material.
a person or thing that scans
a device, usually electronic, used to measure or sample the distribution of some quantity or condition in a particular system, region, or area
an aerial or similar device designed to transmit or receive signals, esp radar signals, inside a given solid angle of space, thus allowing a particular region to be scanned
any of various devices used in medical diagnosis to obtain an image of an internal organ or part See CAT scanner, nuclear magnetic resonance scanner, ultrasound scanner
(informal) a television outside broadcast vehicle
short for optical scanner
(printing) an electronic device which scans printed material and converts it to digital form
1. An input device that takes in an optical image and digitises it into an electronic image represented as binary data. This can be used to create a computerised version of a photo or illustration.
A scanner may be linked to optical character recognition software allowing printed documents to be converted to electronic text without having to type them in at a keyboard.
2. lexical analyser.
noun, Television. 1. (in mechanical scanning) a disk with a line of holes spiraling in from its edge, rotated in front of a surface so as to expose a small segment as each hole passes before it for transmitting or reproducing a picture.
noun 1. a device in which the specimen is examined point by point directly in a moving electron beam, and electrons reflected by the specimen are used to form a magnified, three-dimensional image on a television screen. Abbreviation: SEM. scanning electron microscope noun 1. a type of electron microscope that produces a three-dimensional image scanning […]
- Scanning force microscope
scanning force microscope See atomic force microscope.
noun 1. (in a cathode-ray or television tube) a single horizontal trace made by the electron beam in one traversal of the fluorescent screen. Compare frame (def 9).