Generating a chroma keying signal

Details Generating a chroma keying signal Generating a chroma keying signal

1985-04-22

1987-01-13

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, H04N 975

Patent

active

046368388

ABSTRACT:
A chroma keying signal generator has an input (1) to which digitally encoded color difference signals (R-Y and B-Y) are applied and output (27) at which a keying signal is produced. The arrangement calculates a value tan.sup.-1 (R-Y)/(B-Y) which represents the hue and a value (R-Y).sup.2 +(B-Y).sup.2 which represents the (saturation).sup.2. Preselected values of hue and (saturation).sup.2 are stored in latches (20,22) and compared with the calculated values derived from the incoming color difference signals in comparators (24,25). When the calculated hue is substantially equal to the value stored in latch (20) and the calculated (saturation).sup.2 is greater than the value stored in latch (21) both comparators (24,25) produce an output which causes the AND gate (26) to produce a keying signal which is applied to output 27.

REFERENCES:
patent: 4386363 (1983-05-01), Morrison
patent: 4408221 (1983-10-01), McCoy

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