Chroma keyer color discriminator

Details Chroma keyer color discriminator Chroma keyer color discriminator

1983-03-28

1989-09-05

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 975

Patent

active

048643882

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.

REFERENCES:
patent: 3959813 (1976-05-01), Legler
patent: 4183045 (1980-01-01), Herrmann et al.

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