Chroma keyer color discriminator
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United States of America Patent
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-
Sep 5, 1989
Grant Date -
N/A
app pub date -
Mar 28, 1983
filing date -
Mar 28, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A chroma keyer color discriminator wherein orthogonal color difference signals B-Y and R-Y are rotated through an angle .phi. corresponding to a desired chroma keying signal where R and B are red and blue signals and Y is the luminance signal where Y=0.3R+0.59G+0.11B. The rotated signals (R-Y)' and (B-Y)' are processed to develop B'-G' and B'-R' signals to enhance the selectivity of the discriminator. Difference signals other than B-Y, R-Y, B'-G', and B'-R' may also be employed.
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