Method and apparatus for keying a digital video signal
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United States of America Patent
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-
Aug 27, 1991
Grant Date -
N/A
app pub date -
Sep 14, 1989
filing date -
Sep 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for keying digital color TV signals to avoid 'stairstepping' of pixels at the edges of the key while retaining a hard switch between the keyed scenes. This is achieved by comparing successive digital keying signals with a desired digital clip level. In the event that the clip level occurs between two successive digital signals an interpolation of the clip level between these is created fractionally. A digital representation of this fraction is then included in the keying signal so that keying is accomplished on a sub-pixel basis without acutally increasing the frequency of sampling.
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