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interlaced scan
Last modified: Tuesday, December 20, 2005
Interlaced scan is one of two methods used for "painting" an image on a
television screen (the other being progressive
scan). Designed for the analog NTSC television
system, interlaced scanning uses two fields to create a frame. One field contains all the odd lines in the image, the
other contains all the even lines of the image. A television scans 60 fields
every second (30 odd and 30 even). These two sets of 30 fields are combined to
create a full frame every 1/30th of a second, resulting in a display of 30
frames per second. Drawbacks to
interlaced scanning compared to progressive scanning include
flicker, lower
resolution and quality issues.
Interlaced video Interlaced video exploits various technical possibilities of video broadcasting, to reduce the frame rate (and therefore the transmission bandwidth), while avoiding a frame rate that would be too slow for the eyes to to cope with (bad strobing).
Panasonic - Ideas For Life This Panasonic Ideas For Life article describes the benefits of progressive Vs. interlaced scanning.
