- Scanning is quickly looking over a vast area at all parts of something.
When your eyes dart over a whole crowd in a room, this is an example of a situation where you are scanning the crowd.
The process of refreshing a video screen. Interlaced scanning, which is used with most analog TV systems, involves two fields. Odd lines (field 1) are refreshed in one scan, and even lines (field 2) in the next. Each set of odd and even lines refreshed constitutes a frame refreshed. The scanning rate is a function of the power source of the receiver. For example, the American NTSC standard provides for 30 fps, involving 60 scans, which relates directly to the 60 Hz of the United States power source. The European PAL standard provides for 25 fps, involving 50 scans, which relates directly to the 50 Hz of the European power source. Progressive scanning involves displaying all horizontal scan lines in one frame at the same time, which avoids the problem of interline flicker. See also frame rate, NTSC, and PAL.
Variant of scan
- to analyze (verse) in terms of its rhythmic components, as by counting accents and syllables and marking the metrical feet
- to look at closely or in a broad, searching way; scrutinize
- ☆ to glance at quickly; consider hastily
- to examine, identify, or interpret (printed characters, video images, bar codes, etc.): said of an electronic device
- Comput. to examine (items in a file) in sequence in order to find those that meet a particular criterion
- Med. to examine the structure or condition of an internal body organ with ultrasound, tomography, etc.
- Electronics to traverse (a region) with a succession of transmitted radar beams, usually radiated in a systematic pattern
- TV to traverse (a surface) rapidly and point by point with a beam of light or electrons in transmitting or reproducing the lights and shades of an image
Origin: Middle English scannen ; from Classical Latin scandere, to climb, mount (in Late Latin to scan): see descend
- to scan verse
- to conform to metrical principles: said of poetry
- the act or an instance of scanning
- scope of vision