scan (redirected from scanned)

(1) In optical technologies, to read a printed form a line at a time in order to convert images into bitmapped representations or convert characters into text. See OCR.

(2) In video, to move across a picture frame a line at a time, either to detect the image in an analog or digital camera, or to refresh a CRT display.

(3) To search a data file sequentially for specific content.

(4) To search an executable file for a particular pattern. See antivirus program.

(5) To sequentially search for peripheral devices attached to the computer. See Win Rescan peripherals.

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1.		SCAN - ["A Parallel Implementation of the SCAN Language", N.G. Bourbakis, Comp Langs 14(4):239-254 (1989)].
2.		SCAN - A real-time language from DEC.
3.		scan - (computer peripheral) See scanner.
4.		scan - (circuit design) See scan design.
5.		scan - (functional programming) See scanl, scanr.
6.	(storage, algorithm)	scan - An algorithm for scheduling multiple accesses to a disk. A number of requests are ordered according to the data's position on the storage device. This reduces the disk arm movement to one "scan" or sweep across the whole disk in the worst case. The serivce time can be estimated from the disk's track-to-track seek time, maximum seek time (one scan), and maximum rotational latency. Scan-EDF is a variation on this.