Topical Terminology > Active Scan Line
1 Definition
Active Scan Line
For Active Scan Line we have a term and definition in Television.
Active Scan Line (Television) 
Refers to a scan line holding picture information including black for letterbox bars, as opposed to synchronizing information or encoded closed caption text. On this web page we sometimes say "illuminated scan line" when we mean "active scan line". As an example NTSC video has 525 scan lines of which approximately 480 are active.
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