Method and apparatus for compositing video images

Details Method and apparatus for compositing video images Method and apparatus for compositing video images

1993-04-15

1994-08-30

Groody, James J.

Television

Image signal processing circuitry specific to television

Special effects

348587, 348592, H04N 974

Patent

active

053432525

ABSTRACT:
A method and apparatus to improve the control signal E.sub.c used in a video image compositing system so that the adjustment to achieve an E.sub.c of just zero for green objects and flesh tones, does not simultaneously reduce E.sub.c in grey scale subjects and cause print-through. The invention also reproduces a wide range of blue colors from pale blue to bright blue in the presence of a blue backing without raising a matte density control and without raising noise level. The invention also provides a second control signal, E.sub.k, that eliminates backing color spill from blond and brown hair, without affecting bright foreground white tones. The invention also generates a SHADOW CLEAN-UP signal that eliminates foreground shadows, while preserving most of the foreground detail information.

REFERENCES:
patent: 4580158 (1986-04-01), Macheboeuf
patent: 5032901 (1991-07-01), Vlahos

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