Analog chroma keying on color data

Details Analog chroma keying on color data Analog chroma keying on color data

1993-11-19

1995-03-14

Groody, James J.

Television

Image signal processing circuitry specific to television

Special effects

348591, 348592, 348587, H04N 975

Patent

active

053980751

ABSTRACT:
A circuit for analog chroma keying on color data permits display of graphics, generated from a computer system, and video on an output display. The analog chroma keying circuit receives the graphics signals and the video signals, wherein the graphics signals include color data to designate a color key. The analog chroma keying circuit includes a plurality of digital to analog converters that generate a plurality of color key limits for defining a range to detect the color data denoting the color key. The analog chroma keying circuit also includes a plurality of comparators coupled to receive the graphics signals and the color key limits for each primary color. The plurality of comparators generate a key on indicator when the graphics signals fall within the color key limits. The key on indicator is input to a plurality of analog switches that couples the graphics signals to the output display when the key on indicator indicates the graphics signals are not within the color key limits, and couples the video signals to the output display when the graphics signals are within the color key limits.

REFERENCES:
patent: 3764732 (1973-10-01), Macheboeuf
patent: 4908700 (1990-03-01), Ishii et al.

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