scan - technical definition

(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.