About Progressive Scanning
Progressive scanning is much simpler than interlaced scanning: each line is scanned
consecutively until a complete frame is drawn. Computer displays and many recent
HD televisions use progressive scanning.
Here are some significant facts about interlaced and progressive scanning methods:
Â Interlacing provides twice the perceived frame rate with only half the recording or
Â Progressive scanning is preferred when interlacing artifacts (such as thin flickering
horizontal lines) would be unacceptable. Progressive images are often considered
more film-like because there are no flickering interlacing artifacts.
Â Computer displays are almost always scanned progressively.
Â NTSC and PAL televisions always use interlaced scanning.
Â Many HD video cameras can record progressive frames.
Â Video destined for computer-only use, such as web video, should always be