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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.

Compare with progressive scan.

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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.

related categories

Digital Television

Home Entertainment

Multimedia

related terms

analog television

bad strobing

DTV

EDTV

HDTV

HDTV tuner

progressive scan

SDTV

television aspect ratio


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