Chroma key signal generator for a video editing apparatus

Details Chroma key signal generator for a video editing apparatus Chroma key signal generator for a video editing apparatus

1989-09-15

1992-06-16

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 975

Patent

active

051228653

ABSTRACT:
A chroma key signal generator for a video editing apparatus which enables a chroma key signal to be obtained from a composite video signal. The chroma key signal generator includes a color selecting circuit which provides one or more chrominance subcarrier signals having predetermined phase differences from the chrominance subcarrier signal separated from a color video signal, selects one among the chrominance subcarrier signals and provides a specific chrominance signal by adjusting the phase of the selected chrominance subcarrier signal, and a phase detecting circuit which compares the phases of the selected chrominance signal and the chrominance signal separated from the color video signal and provides the chroma key signal when the phases of the chrominance signals are detected to be the same.

REFERENCES:
patent: 4122490 (1978-10-01), Lish
patent: 4953011 (1990-08-01), Mori et al.

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