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scan line[′skan ‚līn]
A horizontal row of pixels on a video screen that are examined or refreshed in succession in one sweep across the screen during the scanning process.
The line produced on a recording medium frame by a single sweep of a scanner.
scan lineA horizontal line (a row) in a video frame. Camcorders sense image frames a line at a time, and display systems create images a line at a time. The scan lines are the vertical resolution of the system; for example, an NTSC TV signal uses 525 lines, 480 of which contain image data ("active" scan lines) and 45 are the vertical blanking interval (VBI) in between the frames. Following are the active scan lines of various video formats. See scan rate and horizontal scan frequency.
Analog ActiveFormats Scan Lines VHS 240 8mm 240 Sony U-matic 3/4" 250 Sony U-matic SP 330 S-VHS 400 Hi8 400 Laserdisc 425 NTSC 480 out of 525 PAL/SECAM 580 out of 625 Digital ActiveFormats Scan Lines DVD 480 DV 480 SDTV Digital TV 480 EDTV Digital TV 480 HDTV Digital TV 720 & 1080